Can stress cause hermaphrodite marijuana plants

Marijuana plants come in two forms: male and female. But what about plants that exhibit traits from both sexes?

These are known as hermaphrodites, and they can be very frustrating for marijuana growers.

In this article you will learn: Can stress cause hermaphrodite, how to avoid and how to identify.

Hermaphroditic marijuana plants have grown both male and female flowers. That being said, hermaphrodites aren’t usually born that way.

They originally grow as either a male or female plant, and then develop the opposite sex’s characteristics because of certain outside influences or genetic traits.

What is a hermaphrodite?

In this picture below you can see a clear example of a hermaphrodite flower. It has both pistils (female) and little balls (male).

Hermaphroditism is a characteristic of marijuana plants that can be seen in the wild, as well as through artificial induction.

Hermaphrodites are generally not useful to marijuana growers because they don’t produce a lot of consumable buds or flowers, but they can be useful in creating feminized seeds, for a future generation of successful growth.

Female male hermaphrodite marijuana plant
Female, male, hermaphrodite marijuana plant

If they occur in the garden of a grower who is not planning for the future, they can even be considered a nuisance.

Their pollen will be released on the other female plants that could have been sinsemillas, essentially ruining the crop.

Download my free Grow Bible for more information about hermaphrodite plants.

Sometimes hermaphrodites don’t become such until the final days of the flowering period, but these don’t pose any threat to your sinsemilla plants because they won’t have time to release their pollen and fertilize them before you harvest the crop.

How does it happen?

There are two origins that could be to blame for your marijuana plants being hermaphrodites.

The first is genetics. Some strains of marijuana simply have a higher sensitivity to hermaphroditism, such as Thai sativas.

The second cause is environmental influences, which usually materialize as stress.

Essentially, as soon as the plant “knows” that the conditions for flowering are too difficult, it will gain the traits of the opposite sex to pollinate its own female flowers by growing male pollen clusters, therefore shortening the flowering period.

hermaphroditism in marijuana
How does cannabis hermaphroditism happen?

The main stressors that might cause a marijuana plant to become a hermaphrodite include:

  • Photoperiod changes or disruptions
  • Temperatures being too high, or other environmental issues that the plant doesn’t thrive in
  • Leaving the harvesting until it is too late
  • Broken or damaged parts of the plant
  • Too much or too little water
  • Over-fertilizing
  • Diseases or pest infestations, or phytotoxic product use, such as fungicides or pesticides
  • mother plants that have been growing for too long might begin producing hermaphroditic clones as well

You can also reduce stress by protecting the core of the plant itself, using my Plant Protector kit.

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Every female marijuana plant could become a hermaphrodite

When under the correct circumstances, any marijuana plant has the potential to become a hermaphrodite. It’s important to remember this when selecting a strain.

While strains with a higher tendency to become hermaphrodites increase the chances of it happening again, strains that don’t have this tendency very well might become hermaphrodites nonetheless.

female cannabis plant
Female marijuana plant

This usually occurs via the use of hormones, or bad treatment. The resulting stress can cause the flowering phase to be left to its own devices for too long.

It is an evolutionary trait for females to become hermaphrodites when it’s been too long, and they haven’t been fertilized yet, as it allows for the continuation of the species, despite difficult conditions.

The function of the male plant is to produce pollen that fertilizes the female plant’s flowers, spurring it to grow seeds.

Female plants that are never pollinated, such as when no male marijuana plants are growing in the area, continue to use their resources to grow the buds and flowers instead of seeds.

Male vs. female

This produces more THC than male marijuana plants or fertilized female marijuana plants.

These unfertilized females are referred to as “sinsemilla,” which literally means “without seeds.”

Because females are the only ones of the marijuana plants that will grow the resinous buds that are coveted by smokers of marijuana, sinsemillas can grow for longer, forming, even more, THC.

Male and female marijuana plant comparison
Male and female marijuana

They are the coveted type of marijuana plants that every grower would like to achieve.

But, considering that as much as half of every crop will be made up of males, this is a task that is not exactly easy to accomplish.

If you can do it, however, you will be rewarded with an especially sweet, gentle smoke from your sinsemilla plants. So it is certainly worth the effort.

Identifying male marijuana plants

The key to getting sinsemilla plants is to correctly and quickly distinguish which plants are males, and which are females.

Generally speaking, male marijuana plants grow taller when they mature and have thick stems, not as many leaves, and sporadic branching.

Learn to harvest and protect your marijuana plants from stress like a pro in my downloadable Harvest Guide!

When they are old enough for flower development, male plants will grow little balls of buds that don’t have any white hairs.

In contrast, the female plants will develop small white hairs and no ball-shaped buds.

The male plants’ sacs will eventually open, and then push back their sepals in order to release pollen.

If you are growing the plants outside, you can expect males to reveal themselves toward the end of July in temperate climates in the Northern Hemisphere.

male cannabis plant
Male marijuana

And toward the end of January in the Southern Hemisphere, although this depends somewhat on the variety of marijuana you are growing.

Once you establish which plants are males, you should harvest them immediately before they have a chance to pollinate any of the female plants.

The main goal is to do it before the pollen carries over to your females.

Make sure that you don’t jostle or shake them too much when you harvest them, so as to avoid accidentally fertilizing the females around them.

How to remove male marijuana plants
How to remove male marijuana plants

Males are not good for harvesting to smoke because, not only do they not have too much in terms of THC, but their pollen can actually be harmful to people.

Male plants are, therefore, best discarded as soon as they are identified.

Remember, even one or two male plants can wreak havoc on your crop by fertilizing the entire garden’s worth of females, so be sure to keep an eye on each plant, to make sure it’s removed as soon as it begins exhibiting male characteristics.

Identifying female marijuana plants

You will know for sure that a marijuana plant is female by the V-shaped pistils that reveal themselves.

This occurs a few weeks after the males have reached sexual maturity (or, at least, have started to become identifiable), so you should have enough time to separate the two.

If you are growing your indoor plants, however, the females will exhibit their sexual traits just 7 to 10 days after the males have done so.

This reveal date can vary according to which variety you are growing, of course.

Female cannabis plant
Female marijuana plant

If you are looking at the female marijuana plants, you should be able to identify their flower without too much trouble.

They look like small green seed pods that have two white, V-shaped hairs that poke out.

Occasionally the hairs (known as “stigmas”) will come in colors other than white. The clusters of flowers are considered the buds of the plant.

Generally speaking, female marijuana plants are also shorter, denser, and wider than their male counterparts.

This is simply because, when the males are taller, they have a better chance of distributing their pollen further distances.

Female plants usually require between one and three weeks to go from their vegetation period to their flowering phase once the lighting has changed (either artificially or naturally).

Early identification?

Sometimes people think marijuana plants can be accurately identified as male or female before they have even reached sexual maturity.

They jump at the chance because early identification can help immensely with your crop as it takes away much of the possibility that there could be the odd male that slips your notice when removing the males from your crop.

However, this is sadly just a myth. How to tell: male or female Cannabis plant?

After just a couple of months of growth, marijuana plants sometimes develop some “pre flowers,” which often get beginner growers to thinking that they are lucky enough to identify their plants as male or female early.

Unfortunately, while it might be an indication of which sex that plant will turn out to be, it is not accurate or reliable.

So to discard plants that appear male, for example, would risk throwing away an actual female plant that is precious to you. So do not make any rash decisions based on this odd pre-flowering.

To make sure you don’t see any issues arise in your next grow, I have created a balanced nutrient package. This package will have everything to make sure your plants will get the correct nutrients in order to reduce stress.

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Cutting and hermaphrodite flowers

Using one good female plant to provide cuttings for more identical female plants, also known as cloning, is a good way to ensure that you will continue a particularly hearty or healthy plant.

It is important, however, to first know that the plant is female.

This can only be done by force-flowering it. Unfortunately, this process can be very stressful for plants, which in turn produces poor cuttings. So how do you manage it?

Growing marijuana plants from cuttings
Growing cannabis from cuttings

The best way to figure out if the plant is female is by first taking some cuttings from it and then force-flowering those cuttings straight away.

It is less important if those cuttings are stressed out or damaged by this quick change than if the healthy mother plant is.

Once you have established that the plant is female, you can take more cuttings and really cultivate them with dedication and care.

Prevent becoming hermaphroditic

The most important thing to consider when attempting to prevent your marijuana plants from becoming hermaphroditic is to ensure that they are not stressed — especially during the flowering period of their growth cycle.

This means that there should be no pruning or staking during the flowering phase.

Do it beforehand, during the vegetation stage instead.

Other aspects you should consider to keep your plants stress-free are the environmental conditions of the space they are being grown in. Keep the area clean and make sure the timers well monitored.

Regularly inspect each plant for any signs of pests or insects.

Make sure the plants are watered correctly and with the right frequency.

Feed them a balanced nutrient mixture. Keep an eye on the trichomes before you harvest to make sure you don’t wait too long.

marijuana plant
Prevent the development of hermaphroditism

You can also help prevent the development of hermaphroditism before you have even purchased the seeds.

The main thing you need to do is research the seeds you are interested in buying, before actually purchasing them.

Don’t only rely on the information given by the distributor or company itself.

I have created multiple grow sets which features all you need in order to grow healthy plants from seed to harvest!

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Also check out the comments that growers who have actually used this strain have written.

Read up on the seedbank’s official recommendations, and check in or even contact them about whether or not there is hermaphroditism in this strain.

Generally speaking, strains that receive too many complaints of the hermaphroditism are taken off the market.

If you purchase feminized seeds, you can expect a higher tendency toward hermaphroditism than with feminized seeds.

No matter what kind or strain of seed you are growing, however, it is important to often check your female plants for any male flowers that may develop over time as this could lead to major problems within your crop, and, therefore, needs to be dealt with accordingly.

What to do when hermaphrodites are found

First of all, don’t panic, and hastily expect your entire crop is ruined just because you discovered one of your female plants is also exhibiting male characteristics.

These male traits are easily identified, as their flowers will be yellow in color, and shaped like a banana.

This should stick out like a sore thumb. Therefore, unless you have been severely neglecting your crop, the chances are good that you have caught the plant in the early stages of developing male characteristics.

male and female marijuana
Hermaphrodites are found

As soon as you confirm that one of your plants has both female and male flowers and it was discovered during the early stages of the flowering phase of growth, you should remove it from the area right away.

While it is indeed unfortunate to take away one of your plants from the future harvest, it is a necessary sacrifice that pays off hugely when the rest of your plants remain unpollinated females.

If you hesitate and leave the hermaphrodite within the growing area for too long, it could be too late, and your entire crop could become pollinated.

If your plants are in the middle of the flowering phase, things need to be done a little differently.

If the hermaphroditic plant just has a couple male flowers, they can simply be removed without removing the entire plant.

Do this by using a sterilized pair of tweezers. How to Identify a Hermaphrodite

Another option is to simply spray water on those few male flowers, as water actually sterilizes pollen.

Keep your eyes peeled for more banana-shaped flowers that might develop in the future.

If, however, the plant has developed quite a few male flowers, it is probably best to just remove the entire plant altogether.

Otherwise you may not be able to stay on top of all of the male flowers, missing something and, therefore, ruining the rest of your crop. That is simply not a risk worth taking.

There is one other time in which you might discover a hermaphrodite among your female plants: at the end of the flowering phase.

If this happens, you can simply harvest the plant straight away, before the male flowers even have time to drop their pollen on the surrounding females.

This is ideal because you will still have the harvest from that plant, but it might be just a bit earlier than you would prefer (which is not always a bad thing).

Seeds discovered in your harvest

If you have found seeds hidden amongst the buds that you have taken after the harvest of an all-female garden, then that shows that there were, in fact, hermaphrodites (or even just one hermaphrodite) living amongst your crop.

Next time around, be more careful when checking your plants, or perhaps just inspect them more frequently.

Unless you want to grow them for very specific reasons, it is best not to grow the seeds that you have discovered because the chances are high that the resulting plants will be hermaphroditic as well.

It is generally safe to assume that plants whose parents you know exhibit certain traits, will also exhibit those same traits.

Sometimes people attempt to feminize their seeds so that they have an entirely female crop before they have even begun the germination process.

cannabis seeds
Cannabis seeds discovered in your harvest

This feminization can be done in numerous ways, but in this case it can be done through a female plant becoming a hermaphrodite and self-pollinating, meaning that genetically the seeds have come from “two” females rather than one male and one female.

This leads to increased chances that the seeds will be female.

However, many growers have complained that this simply leads to a huge crop of future hermaphrodites, or at least that the chances are far higher that these seeds will develop with both female and male flowers.

It is therefore not advised to proceed in this manner, as it could end up being a total waste of time and energy.

A crop full of hermaphrodites is no good for anyone.

Remember that plants with strong genetics have less change of getting sick and are less vulnerable for diseases, deficiency’s, pest and environmental stresses.

So make sure to buy marijuana seeds from a trusted seed bank.

Faq about stress and marijuana plants

What is a hermaphrodite?

A plant having both male and female reproductive organs, structures, or tissue is know an hermaphrodite.

What causes hermaphrodite in marijuana plants?

There are two things that could be the cause of hermaphrodite in marijuana plants: Genetics and environmental influences, which usually materializes as stress.

how to prevent your marijuana plants from becoming hermaphroditic?

The most important thing to consider when attempting to prevent your marijuana plants from becoming hermaphroditic is to ensure that they are not stressed especially during the flowering period of their growth cycle. 

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


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Mr Robert Bergman PhD


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

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45 comments on “Can stress cause hermaphrodite marijuana plants”

  1. Hi Fredrick,

    Thanks for your comment. Our support staff will reach out to you about this and we will see what we can do to resolve this, of course!

    Kind regards,

  2. The last purchase of Afghan seeds from your company resulted in 5 hermaphrodite plants from 10 Seed’s. Do you compensate for them?

  3. One of my Blue Dream plants became hermaphroditic this year. Totally my fault as it was a very dry year and some of the plant was damaged by wind. I had to remove that plant. A second plant also showed some male flowers but I picked them and increased watering and it stopped producing male flowers, so I saved the second one. The harvest was good otherwise. I learned something. Never had this happen before. I think water stress was the biggest factor. Good thing I was watching.

  4. Friend planted some of your seed all from same strain og kush One looks different long skinny leaves while the other 2 plants are wide thick leaves they are now 3 weeks into flowering what should he do

  5. I am harvesting and I had taken 2 males out as soon as I saw the balls. Now the first plant that I started I found seeds in the buds,10 seeds. Is this still smokable? Or should I just toss the plant? Starting on another plant to see if any buds have seeds.

  6. I have only recently discovered this great place. (ILGM). I’d like to say thanks for being so very generous with so much great information. You folks are fantastic!! And I’ve learned so much. ❤️

  7. Even with preflowers it’s not a guarantee its female. Sounds like you had a male plant. Yes females usually preflower but males preflower sometimes looking like females. A male doesn’t show pre balls, most males with have some preflower with hairs and then becom male when you switch to 12 12. I go with feminized seeds. Bagseed is too stressful. I started 48 bagseed, 46 sprouted out the ground, they grew out to be 30 females rest male. Then as they grew I got another 20 males leaving 10 flowering girls. Of which 4 have made flower and pollen sacks. This is just my pass time. I grow real seeds for my smoke. Down from 48 to 6. Sounds like a waiste of soil and nutes eh.

  8. I am curious to know if an Amnesia Haze Autoflower can go 40 days without showing signs of white pistils?Is this unusual as the genetics are from a reputable seed bank….Thanks

  9. Hi there. I now have seeds was very careful to yank all males babysat them faithfully. I Went on vacation (at end of September) returned for harvest. Seeds are now in my buds so is it worthless? I’m not a smoker so when I tried it I FELT it.but leaf would do the same to me. LOL

  10. I have plants in flower week 4 I believe just noticed a nanner on same plant top colas it’s very close to light can that cause nanners I have had multiple runs no problem should not be a light leak

  11. greg clarkson,

    Who are you addressing and what exactly do you take issue with? Your statement is vague and we have no idea what you are critiquing. We look forward to your clarified reply. Peace 🙂

  12. I just read your facts on hermaphrodites ……why are you listening to opinions ??? because they are not correct …no wonder the world looks at this phenomenon the way they do

  13. csaaphill,

    Your plant outdoors could have been pollinated by any number of sources in the neighborhood.

    With that said; If you have a hermaphroditic plant, there is nothing to do but grow it for what you can get.

    Colloidal Silver is too making feminized seeds on a female plant. It does not change the sex of the entire plant, especially, male back to female.

    Spend 60-100 bucks and but some of our feminized seeds once. From those female plants you can generate clones and never buy seeds for a long time. 🙂

  14. Ok the name was wrong silver colloidal or whatever it’s called is what I meant but can you anyone?
    Or am I asking secrets no one wants to admit to. Newby first time ever except for a couple of times when I was younger in trying to grow so new to all this. But I had two plants one either got stolen or chicken scratched not sure and all that was left was apparently a male. Hate buying seeds so am asking this because I want to know. can you herm a male plant and how please anyone?

  15. I want to turn this male into a female or at least have it hermaphrodite on me is this possible or too late?
    What I mean is I believe this plant of mine is male it has the balls as shown but some hairs are showing on some of the lower bud like structures but not sure too small to tell. One Especially on the very bottom it looks like a small bud is forming and has what looks like little hairs on it but again not sure.
    I hear white silver can hermie a plant but atm don’t have any money so can under watering it do this or are there some other things I can do that’s natural?
    It’s outside too so if that helps any?

  16. I’m having a hermie issue not sure if it’s the wildfire smoke or a autoflr trait happen in inside the greenhouse and outside too but not all turning going to try a mistr. I’m thinking its the smoke and the lack of full sun.

  17. Had a nice gorilla glue 2 months veg with nice female calyx pistols 2 wk flower top to bottom all balls even tiny flower on tops look fuzzy no pistols anywhere did this plant turn into a male doesn’t display both sex and diy
    Surely female previewed during veg my thoughts are my bites going into flower p wasn’t high enough

  18. Johnny,

    That is about all you could hope for. Either cull the plant or do as you choose. It is your choice and a learning event.

    Not sure what happened to you becuase bvending a few branches generally does not cause hermie traits. You also failed to mention auto, regular or feminized seeds were not were not used. When I find pollen sacks, I cull the plant.

    Good Luck and maybe you should join our forum at

  19. One of my plants turned hermafrodite when i super cropped it. I had a problem with its height as it stretched a lot during the first phase of flowering. The internet told me that I could super crop it by bending the tallest branches 90 degrees. I did that and the plant seemed to handle that nicely by turning her buds upwards and showing further healthy growth. About a week later I observed pollen sacks on one of the branches, below the bend i had made. This is my biggest of three plants in a small tent, so I am mortified about disposing of it. Instead I will remove pollen sacks every day and hope for the best. Is that a good or a bad idea?

  20. Males & hermaphrodites should be removed as soon as they are found! Don’t waste your time trying to save it by doing this or/& that because its still going to end up tasting like grass or worse.whatever you do, don’t cause your plants to stress out.especially when it is going from veg to flower. 1 more thing is if u really want that hermaphrodite keep it on the opposite side of the wont pollinate the other ones just itself.✂ wisely.

  21. newbo,

    You can gently remove the pollen sack/s, and finish grow. Monitor plant each day thoroughly, and expect a seed or 2. No worries. This happens occasionally.

    Happy growing 🙂

  22. I’m in the end of week 7 of flower!!! Day 53 . and I found a Nana I cut it out !!! Should I go ahead and cut her down or what??? Please help

  23. Im growing in soil, temps around 77- 79, 600w mh for veg but just switched to hps for my last week of veg. Iv been vegging for/ goin on 8 weeks. I have 2 plants goin hoping theyll be monsters. I know there female because they show preflowers.

  24. Hello. I have a couple questions, hoping someone can help me out. Im sorta new to this. This is my 4th grow. Some of my plants leaves dont look rite an the leaves on top almost look like taco shaped. How do i post pics to show you? Please help me out.

  25. Parker,

    It could be both. You could have carried pollen on your clothes, from room to room. Yes Stress does cause “hermies” but, in this day of hybrid genetics being bred with other hybrid genetics; It might just be an unstable strain. Who knows for sure? 😀

    Jappy growing

  26. Hello Robert, or whomever helps answer my question,
    I’m having some hermaphrodite issues. I have multiple rooms, most inside a building, with one built in a greenhouse outside totally separate from the system inside. I had one plant go hermaphrodite in the beginning of bud, and it spread to some of the other plants in that room. I chalked this up to being caused by stress. Then one of the plants in the greenhouse room started to hermaphrodite as well. There is no way it was pollinated by the other plant as the rooms are separate as can be. My question is; with it happening in different rooms is more likely to be environmentally caused or genetically caused? Maybe my genetics have simply gotten weak after cloning for so many generations?

  27. Not very accurate. A hermsphrodire has both chromosomes. A female has 2x’s. That comes from seed. It doesn’t just happen. A female plant however makes it own pollen sacks due to stress which will make females as there is no Y chromosome. They’re called a specious staminate flower. People who get them get real worried and throw their genetics away. It’s typically from light leaks at night. There is also belief that the easier your plant produced nanners from stress, the closer it is to landrace. 95% of the industry is incorrect on this subject.

  28. I have what looks like thorns growing on stem of plant. Was moving location and thorns seemed to decrease once move was over. Could plant be overstressed or sign of hermaphrodite?

  29. I would advise you to grow her out. You only used 1 seed. It is a shame that you had bad luck with electricity.

    An alternative idea would be to take a couple cuttings and root them. If your 1 seed plant turns out to be a female; You will have a viable mother.

  30. I bought WW seeds from you. Planted one for a mother. During the fist two weeks after sprouting, the electricity went out several times ranging from 5 min to 6 hrs. Also the overhead light was left on in the room a couple times after the light timer expired, and the timer was messed up because of the power disruption, All is well now.. She was on a 14 hr light cycle.I would hate to clone hermaphrodites. Do i have to worry about that?

  31. […] For example, it’s possible for your plants to grow just fine outdoors, but if you move them indoors, the stress can cause them to produce male flowers and exhibit traits of both plant genders. If this happens, your only option is to quickly try and pick off the male flowers so that the plant doesn’t self-pollinate. You’ll also want to separate it from the rest of your growing operation so there’s no risk of pollination there either. Also, try not to use seeds from hermaphroditic plants, because every subsequent generation will run the risk of self-pollination. Read more about hermaphrodite cannabis plants. […]

  32. khaled.

    What do you mean? I can understand that you say your Pistils have turned orange-red, and the plant is finishing. After that…You lost me.

    Perhaps you would benefit from joining our support forum. Download and read our free grow bible.

  33. White hairs have turned into orange and red x in the week of flowering What does it mean that I’ve turned around 50%