Vegetative Stage

While all plants share similarities in how they grow, the cannabis plant has its own independent quirks and foibles that set it apart. There are a number of steps you can take during the vegetative stage of weed growth that will help you later down the road, such as what you feed your plant and when you do it.

The Cannabis plant has two main stages in its life cycle: vegetative and flowering stages.

In this article, learn about the marijuana vegetative stage, and what happens after the seed sprouts and the seedling evolves into a young plant.

During the initial growth period of the cannabis seed into a cannabis plant, it builds up structural integrity (stem and roots). It’s only after that the cannabis plants begin to develop foliage.

During these early stages of growth, your cannabis plant will require a lot of nitrogen supplied to it.

Early leaves will begin the photosynthesis process, absorbing sunlight and furthering the marijuana plant’s growth.

After your cannabis plants have germinated and begun to stabilize, consider taking out any late-germinating cannabis seeds or stunted seedlings.

Grab our complete fertilizer set to give your young marijuana seedlings the best nutrients to support their development.

That way these won’t compete with your other marijuana plants for light and nutrients.

Once your cannabis plant has a stable root system and the environment is set up properly, it should just be a matter of upkeep to make sure you end up with a good yield.

The plant will continue to grow and develop given proper nutrients and light, developing a strong structure necessary for the flowering phase.

If you want to learn what the optimal light schedule for cannabis is, please read our guide.

As the marijuana plant continues to develop and mature, it will require additional fertilizer, water, light, and higher levels of carbon dioxide in the environment.

It will also require more nitrogen. You want to make sure you’re providing for all of the cannabis plant’s needs in the growing medium.

In this article, we’ll talk about cannabis seedlings, the vegetative phase, and how to manage foliage development.

Cannabis plant growth stagesAverage duration
Germination stage2-10 days
Seedling stage1-3 weeks
Vegetative stage1-15 weeks
Flowering stage7-14 weeks*

It’s all about maximizing marijuana growth in this vulnerable early phase and making sure you keep your plant healthy and strong right up to the home stretch.

Seedling stage

The leafy foliage of cannabis plants grows in a series. Every series produces a certain number of leaves. Generally, the first series produces a single leaf. The second series will put out three leaves, the third series will produce five leaves, and so on.

The number of leaves produced in a single series usually caps out around ten. You may sometimes see leaves referred to as ‘lamina’ in growing literature.

First leaves - day 12
First leaves – day 12

After about two to three weeks of growth during the seedling phase, your cannabis plants should have experienced about 5 or 6 different rounds of growth.

You should be producing a regular and steady amount of leaves with every new series. You’ll also notice that the branches are beginning to develop and expand outward.

Feeding seedlings

You’ll want to make sure your young cannabis seedlings get lots of nitrogen early on in their development. Your best bet of getting the right dosages for your young plants is to grab a fertilizer that is tailored to this delicate stage.

My free Grow Bible has more details on the veg stage of your growing plants. Be sure to download it today!

Cannabis plant in the vegetative stage

A good growth period during the cannabis vegetative stage will be followed by a strong flowering phase. As a grower, it’s your job to get your weed plants everything they need to develop properly before they flower.

This means developing healthy foliage, a tough structure to cope with the weight of heavy buds, and a strong root system during the veg stage. Keep an eye on the light, nutrients, carbon dioxide and temperature of your grow room throughout the process.

Best nutrients for the veg stage

Using fertilizers comprised of worm meal, blood meal, or bat guano will help you get the nutrients you need from natural sources.

Other grow mediums include various algae compounds, nettle blends, or fish compounds as your organic fertilizers.

Watering during vegetative stage is very important
Watering during the cannabis vegetative stage is very important

There are several factors that make organic fertilizers a better choice for growers than chemical fertilizers.

One of the major reasons it’s better is that it can be very easy to overfeed your cannabis plants and damage them when using powerful chemical fertilizers.

When the first leaves pop out, you’ll want to measure the electrical conductance of your nutrient solution. You want to measure very close to 1 at the beginning.

As the marijuana plant grows and matures through the weed vegetative growth phase, it’s ok for the electrical conductance to be raised up higher. When a cannabis plant has at least 4 or 5 different levels of foliage, you can raise the electrical conductance up again, to about 1.5.

Also read When and how to water cannabis plants

Once branches begin to develop during the vegetative stage of cannabis plants, you can raise the electrical conductance up to about 2, but be careful about too much nutrient solution and water. Overwatering your weed plants can cause it to grow more in the stem then the buds, which is counterproductive for most growers.

Allow your plants’ roots to air out and rest between irrigations. Remember to start adding plenty of nitrogen to your weed plants as soon as the first leaves develop, but make sure you are keeping the electrical conductance at around 1 to start with.

Grab our complete fertilizer set to give your young marijuana seedlings the best nutrients to support their development.

fertilizer for the cannabis veg state

Buy marijuana fertilizer

  • Nutrients from seedling to harvest
  • Enough nutrients for at least 5 plants
  • Discounted combination deal

Environmental factors

The rest of the environment is also something you want to make sure you are optimizing throughout every stage of marijuana growth, but particularly during the early phases. You have a couple of options when it comes to lighting.

After your plants get past the seedling stage, you can expose your cannabis plants to light for a full 24 hours, but it’s better to simulate night and give the plants up to 6 hours of darkness and 18 hours of light every 24 hours.

“Vegetative growth is maintained by giving plants 16-24 hours of light every day. Unrestricted rapid vegetative growth is the key to a heavy harvest.”

Jorge Cervantes

You’ll want sodium vapor or metal halide type lamps to make sure you’re providing the right kind of light.

Keep the air temperature in your grow room somewhere between 68 and 78 degrees Fahrenheit. The roots should be slightly cooler, around 65 degrees Fahrenheit.

Despite this, make sure the soil is warm enough, especially early on. If roots don’t develop properly, the rest of the plant will not either.

Don’t forget to measure the humidity in the room as well. This will affect the efficiency of your vegetative plant’s respiration, and also the early health of the plant.

You want the humidity in your grow room somewhere between 50% and 70%. When the plant matures, it will be less sensitive to humidity.

Controlling these environmental factors will help optimize your plant. However, genetics still play a huge role in determining how the plant develops, and what sort of yield you’ll get.

Optimize your plants' environment in every stage of the cannabis plant growth
Optimize your plants’ environment in every stage of growth

Even if everything is perfect, you can’t turn bad genetics into a great product.

Still, if you are meticulous and careful throughout the cannabis cultivation process, you can always optimize the plant, however high its potential yield might turn out to be.

Cannabis plant veg state week by week pictures

Especially during the vegetative stage of growth, be careful when irrigating and watering your cannabis plants. As the plant grows larger and larger, it will require more water to keep up with its development.

This means it’s easy for vegetative plants to become dehydrated at this point.

Vegetative stage week by week bubble buckets
Cannabis vegetative stage week by week

Watch out for curling or yellowing in the leaves, and monitor the electrical conductance of your nutrient solution if you’re implementing a hydroponics system in your grow room.

Temperature, humidity, and nutrients

Once your cannabis plants hit the peak of their growth phase, you can expose your plants to light for a full 24 hours, but it’s better to simulate night and give the plants up to six hours of darkness every 24 hours You’ll want sodium vapor or metal halide type lamps to make sure you’re providing the right kind of light.

Indoor growers should keep the air temperature in the grow room somewhere between 68 and 78 degrees Fahrenheit. The roots should be kept at a slightly lower temperature, around 65 degrees Fahrenheit.

Despite this, make sure the growing medium is warm enough, especially early on. Remember, your roots need to develop properly for the rest of the plant too.

Don’t forget to measure the humidity in the room as well. This will affect the efficiency of your plant’s respiration, and also the early health of the marijuana plant.

Proper temperature, humidity and nutrients for your marijuana grow room
Ensure proper lighting and temperature in your grow room

You want the humidity in your grow room somewhere between 50% and 70%. When the plant matures, it will be less sensitive to humidity.

Keep adding nitrogen, too! You want the electrical conductance to measure somewhere between 1.5 and 2. If you are using soil, make sure to continue adding liquid fertilizers and monitoring the moisture in the soil.

Determining the sex of a cannabis plant

There are two commonly utilized methods of determining gender in vegetative cannabis plants. Gender is definitely something you want to be certain of because mixing male and female cannabis plants in your indoor marijuana grow room has the potential to ruin your crop.

The first method for determining gender is to carefully examine the 5th series of leaves on your plant. You’ll want to do this right before the plant should flower. Indicas and hybrids with Indica genetics will display their sex between the leaves of the plant right before they flower.

If you look very carefully, you should be able to see a tiny white fiber on female cannabis plants. If the plant is male, it will have a small ball instead of a fiber or tendril.

This method is easy, but it’s not the most reliable, and sometimes it’s very difficult to find the developed sex organs on the plant because they are so small.

Determine sex during vegetative stage
Determine sex during the cannabis vegetative stage

The better method is to take cuttings.

Once your plant is in the vegetative stage, you can take cuttings from the plant and root them in another room. Expose the newly rooted cuttings to 12 hours cycles of light and darkness. The plants should flower within several days. If any of them are male, you’ll want to remove them from the grow room.

Forcing flowering

After you’ve gone through and made sure that you don’t have any male plants in your grow room, make sure you’re ready for the next stage of growth: flowering. Set all the plants up neatly and double-check to make sure they aren’t fighting over any sources of light.

Also read Cannabis Flowering Stages: Indoors & Outdoors

Once the plant is fully grown, besides the flowering stages, you will need to start thinking about harvest time.

Keeping your plants well-spaced is a good way to help ensure a healthy yield. Double-check the roots to make sure all the plants have enough space below the surface as well.

Vegetative stage into flowering stage
Vegetative stage into flowering stage

If you need to transplant your Cannabis because the root system has grown too large, now is the time to do it.

Root systems expand rapidly during the cannabis vegetative stage. You need to make sure the plant isn’t suffocating. If it can’t pull up and absorb the nutrients it needs, it won’t do well during the flowering phase.

My free little Harvest Guide will help you determine the best moment to cut your plants. Download it here:

Night and day

You can force your plant to flower by adjusting the light cycles in your grow room, mimicking a change of seasons.

You’ll want “shorter” days, with roughly 12 hours of light exposure followed by 12 hours of darkness. The easiest way to manage these changes in the light cycle is to use an automatic switch that turns your lights on and off at the required intervals.

Make sure that you stick to these cycles once you start. All it takes is a single exposure to light during one of the cycles of darkness to interrupt your flowering. If the flowering cycle is interrupted, the plant might start growing again.

12 hours of light - 12 hours of darkness for veg state
12 hours of light – 12 hours of darkness

This sort of stress is bad for the health of the plant, and it can result in reduced yield and unpredictable side-effects.

If you do mistakenly expose the plant to light during a cycle of darkness, try to repeat the process again, and this time don’t interrupt it.

Don’t be tempted to look in on your plant while it’s “night-time”!

Get the best results from seedling stage to that much-awaited harvest! Buy high-quality cannabis seeds from my seed bank now.

FAQ about the marijuana vegetative stage

What are the recommended weed vegetative stage lighting times?

To maintain vegetative growth, provide your plants with 16-24 hours of light per day.

What’s the vegetative stage length?

The vegetative stage can last for 3 to 6 weeks, depending on several factors.

When does the vegetative stage start?

The vegetative stage starts after only a few weeks (about two to three) of growth.

Thanks for reading. Please leave comments or questions below and don’t forget to download my free grow bible!

Happy growing!


Avatar for Robert Bergman

Robert Bergman


Robert Bergman is an Amsterdam-based marijuana grow expert who has years of experience from small grows to massive operations ... See profile

139 comments on “Vegetative Stage”

  1. Loved the “how to determine sex” pic! Would love to see something like this used to explain Cropping and Super Cropping. Love your channel. I’m currently trying my first grow with your Grandaddy purple. 2 of the seeds didn’t germinate 🙁 but the other 3 did :)! looking forward to seeing how my first grow goes!

    • Hi Patricia,

      Thanks for your comment and suggestion. We’re working on updating all of these guides, so you can expect imrpoved articles with better images for super cropping as well!

      And make sure to report any seed failures to our customer support team to get some replacements!

      Happy growing,

  2. I have tried many times to download the marijuana grow bible but have never been able to get it. What am I not doing? Thx Deborah

    • Hi Deborah,

      Thanks for your comment. Sorry to hear that. We will send out the PDF manually for you.

      There may be an issue with your inbox or your spamfiler may be bouncing our email.

      Our apologies for any inconvenience!

  3. Seeds again germinated and i planted outside……looking great…..but some are over 10 feet and none flowering….put in ground late may, plants were about a foot Tall……am i bring Impatient?

    • Hi Robert,

      Thanks for your comment. I checked your order history and I noticed you ordered photo-period seeds. Please keep in mind that grown outdoors these will start flowering
      once the days get shorted and the nights get longer. This should be around July/August, so you should see some them starting to flower shortly! You can check out our outdoor grow calendar here to learn more about the Cannabis growing season outdoors:
      I hope this helps, but let us know if you have further questions of course!
      Kind regards,

  4. Very good info but I grow outdoors and keep finding myself in the indoor Hydro avice are. Im sure I’ll figue out how to navigat this program. Also I have added my email address several time and still have not gotten Free Grow Guide and other down loadable books. I checked my spamm also.

  5. It would be so cool to see AnswerS to these QUESTIONS EVERYONE HAS. I Know i have alot of the same. Seems like you only thank people for good comments and ignore useful Questions

    • Hi Mike,

      Thanks for your comment. If you’re having issues its probably best to reach out to our support team:
      [email protected]
      We’d be happy to help you out with any issues of course!
      Kind regards,

    • Hi Marc,

      Thanks for your comment. Photo-periods plants are commonly flipped around 8-10 weeks into growing. Make sure the plants have a nice wide and strong branch structure, so you’ll have plenty of good bud sites, and the branches can support the buds.
      I hope this helps!
      Kind regards,

    • Not impressed with how Easy you say it is yet $300 in im looking at 8 plants 3 weeks old that have 1-2 leaves. Definitely not on its 4-5 leaf grow blah blah blah. How about the book also left my email 3 times and Still no guide. I’m consider my first 8 a loss , done step by step According to Ilgm instruction. So ill try the remaing 7 and let you know. Just wonder why ALL comment are about how AWESOME it all goes?

      • Hi Mike,
        I will send you an email with a grow bible link, and we can help you out with your grow issues through email as well!
        Kind regards,

  6. I’m growing auto plants outside started the end of April I noticed some of the tops dying I think something is laying eggs in the tops also something is eating the inside of the stalk and stems, any thoughts

  7. I have a sativa plant that’s 6 ft tall have leaves indoor plants but don’t have the abundance of the fluff been feeding the compost Miracle growth dirt and all-purpose plant food but it’s not fool like I would think it would be so what do you think the problem?

  8. outdoors and no auto please ,cant fine nkuthing unless they talk about lights are auto some of us don’t do lights are auto the great outdoors baby…

  9. I’m confused. I thought vegetative stage preferred blue lights. Should I convert to reds for better growth?

  10. I have your fertilizer for the plants all fall from him what order do you use them and how much do you give each plant

  11. Hi I’m growing AK-47 and she is 4 weeks today. Doing very well,my question is should I transplant before flower stage?

  12. I have 40 white widows, they were planted at the same time, same light and same water/nutrients. Whay are some 15 inch high and some only 8 inches high.

  13. My tent is set and under my control. I have 3WW sprouted and happy. Not so much luck with the BB. but I made mistakes early. I’m learning but couldn’t have done it without your wonderful grow guides. Thank you.

  14. Hello. Newbie here. Q: when it’ says a plants flowering time is 8 weeks, does that mean it takes 8 weeks to reach the flowering stage, or it’s IN the flowering stage for 8 weeks? Thanks folks. ☮️

  15. I try to do the 18-6 light routine but I don’t have a timer so I’m off a couple hours of light or darkness now and then..
    My question is how does the plant know when to start flowering…is 12-12 the only wAy I can get flowering to start?when do I know when to start the 12-12 routine?

  16. will the native wild cannabis cross pollinate myfeminised purple haze plants that i will be moving out doors soon? also thanks for the quality of the seeds everything is going great so far i will be doing more business with you again thanks again

  17. What if I dont have liquid foods or stores here that dont have any of those food. what can I use as food? what organic can I use. cow or pigs dry waste or fish guts? how can i make my own soil what’s the best soil?

  18. I’ve got 3 plants 3 ft tall where the fan leaves come out there is no growth should I remove them or leave them to feed the sideshoots that should come out their female seeds

  19. I tried downloading the growing guide several times but never got an email confirming it. ( on my ipad). Where is it? Checked my junk folder, not there either.

    • It is an e book so yoh download it. Should be in your downloads. If you have it blocked you may have to adjust your settings.
      Happy growing the ebook is full of good info Robert did a great job.

  20. My plant is 22 days old and is about 5 1/2 inches tall, and is in its 5th series of veg. But I’m only getting three leaves at a time instead of 5,7,or 9. My question is, is this normal and is that about the right height for my plant???

  21. I have 5 plants that are about 5 weeks old i still cant tell if there male or female. I dont have a led grow light all im using is 6 light bulbs from home. Is that enough light for them bc there not growing tall just very busy.

  22. I really appreciate the information I get here. IT helps to make right decisions when in doubt. Thanks again

  23. This is all great information when I was growing hydro but now out in the woods things are a lot different. You have got to help the best way U can but mother nature does the rest mostley I keep my fingers crossed lol. A lot of years I had great crops by just fertilizer a couple of times and a little pruning. And other years not so well are not as great of a crop but always enough to get me through to next growing season. Thanks for the info some I can use for the outdoors

  24. I would like to know if I should cluster them or stagger them on a guerilla grow, and how big should they be when putting them out on their own. And how much water should I put on them per plant and how often, as I’d be wanting to stay away much as possible

  25. Robert,
    All your information is very good and I get a lot of great tips and advice from IGLM. I buy my seeds from you and I get better each grow . Thank you.

  26. I am gro out . Your advice on fertilizers doesn t tell me what to use. I started in seed starting soil and not sure what 3 number fertilizer to use next and then for flowering.

  27. I love all the information you’re sharing with everyone. Unfortunately I grow outside so a lot of what you’re talkin about it’s not relevant to my method of growing. Last year was my first time growing outside on my roof. my purple orange CBD though she was very short her buds were amazing I wish I could put a picture with this message. I posted My pictures on my Instagram account Mistymay64 if you care to take a look but you’ll have to scroll down a bit my old man doesn’t think I should be posting pictures of pot plants so I’m not going to do that this season but I’m certainly not pulling down what I already put up that’s what I tell my silly man it’s legal now.
    Again thank you for all the information you share

  28. I myself, veg 6 weeks, T5
    I use both Led 2000 watts Cob and Metal halide 315 As well when Cooler @ 600 watt Hps. All indoors

  29. I start my plants indoor with T 5 s I use Happy frog soil then move them outside middle of may my question is I plant in holes with Same soil happy frog what nutrients do I add and when

  30. Thanks Rob I gained a lot knowledge with the article,since it’s legal in Michigan now I can really have some real nice fat ass plants ,I see nitrogen is key in the beginning I just want to veg them for around 2-3 months ,give them a great base before I flower them is this a good idea or am I over thinking?????

    • John,

      We have to assume you are indoor growing. With that said; Depending on strain you could run into problems if you veg too long. First off; 3 months of veg will increase the time plant takes to finish. 2ndly; you may end up having to tie down plants and expend alot of effort keeping them under your lamps. We suggest 2 months Maximum for veg until you see how it goes. Another note: It depends on wheteher you are gorwing indica, Hybrid, or Sative/Haze genetics. Join our forum for friendly expert and enlightened support to allow to grow successfully. Peace

  31. I enjoy all of the information here at DR. Roberts house of Marijuana lot’s of tricks of the trade. However pimping Seeds is bullshit, not a Fan of Commercials. !

  32. As a commer grower – i am const trying to lear more, i enj your common sense layo of the vari cyc of growing-

  33. Douglas, If you go to our store and look on the nutrient page, there is a feeding schedule that works perfectly. Start used for 2 weeks = 1/2 tsp. per gallon. Grow is used throughout veg cycle = 1/2 tsp. per gallon. Bloom used throughout flower including weeks 5-6 where you add Booster = 3/4 tsp. per gallon. Boost used 2-3 weeks before finish is added to Bloom at 1=2 tsp. per gallon along with the 3/4 tsp. of bloom. Boost is only used ofr 2 weeks.

  34. Toni,

    you can look in on your grow during the dark hours but, you cannot turn on the light. Interruption of the dark period can cause plants to hermaphrodite, although this is more Prominent during flower.

  35. I have recently perched your fertilizer kit. Can u explain the feeding schedule? Ur Direction siad to rely on ur personal situation well I don’t have one. The last time I used fertilizer I about killed can u please walk me through the process. Thank .

  36. So is it ok to look in on them during the Veg stage when its dark those 6 hrs? It’s quite cold where we are and I need to Monitor the temp closely & adjust things.

  37. Trying some White Widow Indica seeds this time. Seems to be taking longer tho get to flowering stage than my previous plants. Is this an Indica thing??

    • Flowering indoors occurs when you induce flowering by changing the photo period from 18/6 to 12/12. Simple as that.

      Feel free to join our forum where we can help guide you through your grow successfully. Happy growing, 🙂

      • After I’ve been On theOn the 1212Schedule to Promote flowering do I change back to 18 hour days to help growth and when?

  38. my plants are 6 weeks old 3 feet high ig grow tent when should they be out of veg, and put into flower stage help firstimer

  39. kames,

    You do not want the roots exposed to heat. I would use cloth pots, dig a hole and use the cooler dirt in the hole to shelter my root zone ion the pot. I also recommend for outdoors western growers to place posts every 8′ and invest in 50-60% shade cloth to bring those temps down on the canopy. Shade cloth could be your best friend. “Go Bobcats!” Sorry, I used to live in San Angelo 🙂

  40. my seeds have germinated and I have planted them in small containers my question is since I live in South Texas where the temperatures always get in high 90s and we are all ready experiencing temperatures in the low 100s should put these new planted tap roots in direct or indirect sun light

  41. Wayne,

    I think you should join our forum. I am sure you will get a good exchange of info there 🙂

  42. hey all a friend gave me 6 bag seeds all are coming along fine i have a aerogarden to start them with. i topped he 4th node and again at the 4 node which made 6 0r 8 stuck them i 6 5 gal pots with manure /cow/sheep/ far they seem to like and the stalk is about the size of almost a nickel coin roughly 3 foot high. growing in my shed led light and a fan running. 18/6 liight looks like all female and they are starting to smell.i started the seeds in the aerogarden last xmas. it was a gift.all i have given is water not sure what to expect first time growing any tips on em or should i just stick with bottled water. thanks wayne

  43. just set up indoor room with 4=2000 watt LEDs and the plants are about 1 month in veggie cycle.How long should I keep them in this cycle?

  44. and also is it ok to giv them freezing water? dats wa av been doin jus cold water out tap 80percent dem looking good . thanks

    • Wiffin,

      Hard time making out your language but, here goes.

      No freezing water. Water temp need to be between 65-70f 68f is optimum for oxygen retention.

      You can switch to whatever nutrients you want as long as they work.

      If you have seeds of different strains and traits; You will see plants of different sizes in your grow. Nothing you can do about the genetic make up of your plants, except for investing in quality, stable genetics. Happy growing

    • Sorry for the really late reply. Never saw this. I suggest you join our forum, if you haven’t. No. Do not shock your roots with freezing water

  45. hi can some1 tell me how come some my plants are smaller than others is dat nomal some are a lot smaller and what do I do to make it up do I just leave den or give den something. and also I started off using vita link is it possible to switch my feed over to jus coco a an coco b an stop giving it vita link

  46. i have been growing northern lights for 2 months now, there are some great leaves coming in on top of the plant which is now 4 to 6 inch’s tall. My concern is that the main stalk is pretty skinny and does not look like it is getting any thicker. I have the plant tied up to a stick to help support its top heavy ness. Is this the way the plant grows? Should i be concerned and just play the waiting game? any advice would be great

    • RTM,

      I am not trying to be rude or to insult you (it is not our way…) but, if you have a plant that has been in vegetative cycle for 2 months and it is only 4-6″ tall; You are doing somehitng wrong. My plants are 4-6″ in 2 weeks from seed germination. We are not set up here in the Blog for such grow support.

      I strongly advise you to join us at and start a grow journal or topic, and allow us to see what you’ve got and we can guide you from there. Hang in there.

  47. Twinhd,

    After several weeks in flower it is not advisable to re-vegitate your plant. However; I f you decide to do so, just place the plant back into 18 or more hours of light. The plant will stress for 1-2 months and I cannot guess what would happen next. Not a good idea.

    Happy growing

  48. I’m into a flowering stage for several weeks now is there a way I can return her to a vegetable stage?

    • You can absolutely put the plant back into veg, it’s never too late. Just remove any “buds” and put it back to 24h light for a week, then 18/6 again. Takes a few weeks and will be good as new. Many people flower their plants, crop the tops and put the bottoms back into veg for a couple months and flower it again up to 2 more times!! Very common and safe, no loss in quality. I have personally reversed flower 4 times this year on multiple plants after a delay of between 3 and 5 weeks with no issues.

  49. I m having the same problem D-ROCC, I ma first time grower,outdoors.Trying to do everything right , but just don’t seem to be working out.

  50. My leaves keep dieing they keep curling up turning yellow or yellow on the tips and it spreads on the leaves or the leaves get brown spots on the leaves…..what am I doing wrong…..this is my first time growning……

  51. How long can you stay n veg., before going into flower? First time grower. I have some n flower and next run in veg… Think I jumped gun. Veg will last 6-7 weeks til flower stage ends. Help

  52. Tina,

    You really need to join our forum. The blog is not set up for wholesale grow support. More simple Q & A.

    A 2 foot fluorescent is good for propagation and early vegetation only.

    Happy growing.

  53. Hi guys, i just want to know if two 18w 2 feet fluorescent uv lights can be used in the vegetative stage. this is our first grow and after putting this uv light, with a few LED red and blue strips, the plants seemed to have started becoming much healthier. And how many weeks should i leave it in the veg stage? thanks so much!

  54. William,

    It all depends on how long the dark period was interrupted. But most likely nothing will happen. If the lights were left off for 2 long this could have an affect on the plant but, leaving the lights on too long just promotes vegetative growth.

    Happy growing, 🙂

  55. Robert love the site seeds and info. However I have tried multiple times to download the grow bible and have had no emails received or success to the download.

  56. I have 4 White Widow plants growing under lights. They are still only 3 – 4 inches tall, very leafy and green but I’m thinking they should be double the size by now ? I am using a 4 ft. 4 bulb florescent fixture. Supplemented by a full spectrum bulb. Are they on track ?
    May have to try again. I am using Miracle Grow on them

    • Makesureyoure led lights are at a lux of about 4500 5500 during seedling/veg then 6500 during flower. Blue light spectrum to red light spectrum…get it?

  57. How are to you, I’ve requested several times for your free grow bible, I still haven’t received it, ??

  58. Without more information it is hard to give you an informed answer.

    Please join our Support forum, and some of our many members and expert growers, will be able to help you out. 🙂

    When you join, look in beginners forum, and fill out a support ticket.

  59. Please help my plants not doing well the under leaves are yellow n I lost two of the bottom leaves my temp is 81.1 humidity is 52 the soil level is ph 4 phosphorus is 5 potassium is 6please help

  60. I have noticed that a lot of information on this site is contradictory due to language barriers and typo’s, I feel a proof reader is required to make this site even better than it is. A good example is when you speak of light leak then you say try doing it again but don’t disturb them ( contradictory ) , this is in no way meant to sound detramental to you. I do feel it would be advantageous to all users of this site.

    Kindest regards


      • What if I dont have liquid foods or stores here that dont have any of those food. what can I use as food? what organic can I use. cow or pigs dry waste or fish guts? how can i make my own soil what’s the best soil?

      • Was looking for a good fertilizer for my girls going into first flowering out so i need to order right away.

    • Bad example: next time paraphrase what had been said then try to explain it in your own words… the english language is fucked up when coming from another language/country.. and to be honest – maybe it may not make any sense to you however if you were born on this language: it makes perfect sense… I’m a grammatical asshole most of the times and as I read what was said, I hadn’t found many explicit errors to the nature. So with that being said, I find your comment an error within itself. All the best.

      • “I’m a grammatical assholes most of the times…” sound like you needed to proof read a little better.

    • If you basically know your Pot plants,you should basically know what is being said.(written!?.). Happy growing.

  61. Lee&Jo,
    Not sure what you mean by 1st stage. how many weeks into flower are you? I have re-potted in flower, but I carefully remove plant, and place it gently in new pot. New soil can encourage more root growth. A trick I used to employ was to take the flowering plant and place it right into a bag of potting soil; No pot at all. Very easy on the plant, and it will thrive. If you are more than 2-3 weeks in flower…I might ride out the grow in the smaller pot, just to be safe.

    • The thing with re potting and the soil content is the bacteria, just like in a fish tank… re – potting during the vegetative stage is fine, however if your doing it during the harvesting stage your most likely going to run into some problems… heck i’ve had branches break and have to be mended back to the plant just before harvesting: it sucks a whole lot, mainly because it takes roughly a week or two for the plant to fix your mistake of breaking the branch clean off… luckily when this instance happened it was above the node slightly but still. Holds the cycle back thus much more… As could be or can be the issue when re potting plants, however as long as everything adjustment wise is done within the vegetative stages you should be perfectly fine as long as your doing things within proper parameters as explained above.