What Is The Best Soil To Grow Marijuana?

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Marijuana soil

Clay soils

Clay soils are notoriously bad at providing adequate drainage. They can form what, in effect, becomes an intractable layer where water just starts to pool. The roots, then, have no access to oxygen and will be damaged as a result.

Solution: Prior to planting, you should dig up the clay. Clay soils that have substantial amounts of other materials can be optimized in combination with things like compost, fresh organic matter, sand, perlite, or previously used planting mix. Sometimes you can modify clay chemically with things like gypsum and sulfur that will break down the clay’s dense molecular structure. Make sure to feed your plant the right nutrients. Grow, Bud and THC Booster are 100% organic and contain all the necessary macro and micronutrients. Check out their Marijuana Boosters.

Soils that are made up primarily of clay are very difficult to utilize properly. There are a few alternatives, like creating a raised bed or even excavating the clay and swapping it with a more workable soil. With planting holes, you should probably try to find a permeable layer. Areas that will be saturated by rain during growing seasons require mounds or raised beds to ensure that the roots remain well above water level.

Sandy soils

Sandy soils hold like a sieve (i.e. not at all). In fact, water tends to drain right through sandy soils requiring the grower to water the plants several times a day. To increase the water-holding capacity of sandy soil, you can add compost or other decaying plant matter. Of course, this might involve moving a substantial amount of material and may not be feasible in the long run. You can also try water-holding crystals.

Irrigate the plants over an extended period of time using small quantities of water (even as small as a drip). This provides an even moisture level throughout the soil. Watering the plants all at once incurs an almost complete drain, and the soil becomes water-deficient again. Perhaps the simplest solution involves utilizing a 2.5-gallon (9.5-liter) water container with an adjustable spigot. Adjust the spigot so that it provides a slow, but steady drip that can last throughout the day. The steady drops won’t just flush through the soil and they will keep the plant nourished.

You could also try digging a planting hole about 18 inches (45 cm) deep. Then, put a 3 to 6 inch (7-15 cm) plastic tray or a durable plastic bag at the bottom of the hole and fill it up with the soil. The tray or bag will provide a sort of underground reservoir to keep the water from draining out too fast.

Dried-out soil

If you have dried-out soil, simply add a wetting agent to the water that will prevent the moisture from beading on the soil’s surface. These wetting agents allow the soil to easily absorb the water, and can be found at most garden shops. Sometimes, gardeners will just use soap or detergent as a wetting agent.

Add a wetting agent to the water to prevent it from beading on the surface of the soil. Wetting agents allow water to be easily absorbed into the soil, and are available at garden shops. Gardeners some- times use soap or detergents as wetting agents.

If you order marijuana seeds from my webshop and you get problems with your marijuana plants, I’m here to help you. There are guides about plant care where all problems are discussed and you can contact my support team by mail. Please like or share this article!


Robert Bergman

Robert Bergman is an Amsterdam-based marijuana grow expert who has years of experience from small grows to massive operations. His passion for growing lead him to develop his own Gold Leaf strain. Now, Robert is dedicated to sharing his knowledge with the world.... [Read full bio]


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    17 comments on “What Is The Best Soil To Grow Marijuana?”

    1. I am curreently using DR. Earth Vegtabe soil for my seedlings and adult plants. This soil is orgnic and I can’t figure out why for the very first time my plants won’t grow. The plants I planted 4 months ago are still only 6 inches high, no new leaves, so I pulled them up and threw them away as they were yellowish and not growing. I plantred new seeds they are also not growing.

    2. I have a nice bud plant,duckfoot, but it’s about a month away from me harvesting it and there is no smell,,,,

    3. Micela,

      There are so many brands and types of ready made soil out there that I would recommend you find what is readily available to you.

      Perhaps you would like to join out support forum. We have many happy members that wold love to share information on the type soil they use.

      Happy growing 🙂

    4. I am currently studying this before I start this, so I got most questions answered except….. if I choose to buy a bag of soil for inside grow what type should I get- organic, high nitrogen, ????

    5. I planted super skunk indoors 24hrs 60 days put plants outdoors on May 1st northern hemisphere 5 and half months to grow but they went into flowering all 9 bloomed for about 5 weeks then stopped well 8 did one kept flowering harvested on July 5th got a measly 2 ozs dry decent smoke though the rest started back flowering around July 15th something chewed them down at the base of plant the ones that’s still growing is not doing like they should as far as yeild plus dam unusual rainfall caused some bud rot what happened why did everything go wrong and what to expect from the remaining plants

    6. John peniston,

      It is always advisable to use new soil. You should have at least 2 alternating piles of soil if you want continue to reuse old soil.

      Soil can contain pests.

      Soil can be depleted of nutrients.

      If you want to try to use soil over and over again. You best know how to test and rejuvenate and or replenish the minerals in the soil.

      Join our support forum and if you would like me to explain “Solarization” to you. a common practice to rid used soil of pests and disease. 🙂

      Happy growing! 🙂

    7. […] The soil is also something commonly messed up by new growers. Many assume that the soil in the outdoor grow area that they have chosen is nutritious enough because it’s natural. The fact is, however, even natural soil could be far too acidic or alkaline, or does not have ample nutrients for your plants. Be sure to test it extensively for pH. See if it is sand or clay soil, and then make changes accordingly. […]

    8. […] The soil is also something commonly messed up by new growers. Many assume that the soil in the outdoor grow area that they have chosen is nutritious enough because it’s natural. The fact is, however, even natural soil could be far too acidic or alkaline, or does not have ample nutrients for your plants. Be sure to test it extensively for pH. See if it is sand or clay soil, and then make changes accordingly. […]

    9. Rob,

      You need to join our support forum. We can all help you there. You can add images, etc…

      It sounds to me…just a guess, due to the lack of pertinent info.

      The rain water and MG fertilizer is not at the correct PH. You did not mention what PH the solution was; So, I target that issue 1st.

      2nd. I can only assume you re-potted into another pot with soil??? Are you using MG soil with fertilizer? If so; You may have a fertilizer toxic issue. Especially if you are adding fertilizer to fertilized soil.

      Join the Support Forum. 🙂

    10. Hi,
      I have outdoor grow that has been transplanted from a pot a week ago but it has now some concerns. I add Nute (miracle grow) to rain water every 7 days and water every 2 Nd day as it is 30-36c here atm.

      I can’t work out what the issue may be.
      I would like to send a pic.

    11. Earl”E”,
      The best advice I could give you, is; Join our support forum where you will have many experienced growers to draw information from.

      Some pictures would be great in your 1st post. it would help to identify the problem

    12. I see nothing about “what to do about Scales…” please help, in dirt, outside, pet 2′ away, taking down 8′ plants, bad with scales, what to do before planting next time ?

    13. […] is a sun-loving/light-loving annual plant that flourishes in rich, well-drained soil (e.g. well-prepared garden soil). It is a heavy feeder and does better in moist rather than dry […]

    14. […] Sandy soils often drain too well, and the plants won’t get enough water or nutrients. Dried-out soil often needs to be treated, mixed up, and moistened for it to work well. All of these different issues can be fixed by adding different soil types into the mix and balancing out the environment. Read more about the best soil for your marijuana plants. […]