The Right Soil For Cannabis

Learn How to Choose the Right Soil to Grow Cannabis. We Break It Down into the Simple Things That You Should Take into a Count.

Growing cannabis in soil may be a good way to crop fat, flavorsome buds. Moreover, the soil is one of every of the foremost forgiving substrates. What are the most effective soils for growing cannabis? What does one have to know if you wish to create your own soil? Our guide answers these questions and more!

When growing cannabis, using the proper soil is crucial. Unfortunately, sourcing the most effective soil isn’t always straightforward. From cannabis-specific soils to bargain universal substrates and pre-fertilized types, the sheer amount of options may be overwhelming to novices. And what if you would like to create your own soil from scratch?

Let’s discuss the simplest soil for growing cannabis.

Best Potting Soil

Not every soil is suitable for growing cannabis, and not all cannabis requires an identical form of soil. Picking the optimal soil depends on the sort of cannabis you’re growing, your climate, whether you’re growing reception or within the wild, etc.

Aside from these factors, there are some common traits among all cannabis soils. Let’s take a glance at them:

Soil Texture

Cannabis prefers a lightweight and loose soil texture. a lightweight texture promotes root development, and it ensures more oxygen reaches the roots for optimal growth and health.

Soil Drainage ability

Cannabis soil has to have excellent drainage. once you water your plants, it shouldn’t pool on top of the soil. If the soil has poor drainage, your plants will get sick and switch out subpar yields or die.

Soil Water retention

Just as important nearly as good drainage is water retention, which is that the soil’s ability to carry water. Good cannabis soil has an optimal balance of water retention and drainage.

Soil pH value

pH may be a chemical scale that indicates how acidic or alkaline something is. this can be important, as cannabis only does well within a little pH range. an honest soil for weed includes a pH of about 6.0. A pH of 5.8–6.3 is fine, but if it fluctuates too far outside of this range, you may get diminished yields. If the pH is seriously off, your plants will die.

Soil Nutrients

Cannabis soil must contain nutrients so your plants can grow. Fortunately, the majority of soils you’ll buy already feature them. Know, however, that these nutrients will often last only 3–4 weeks. round the time your plants start to flower, the nutrients in commercial soils will likely be depleted. this is often once you should begin to feature nutrients.

If you’re growing without additional nutrients, your soil must contain organic substances like humus, compost, worm castings, guano, etc. Microorganisms within the soil will turn these substances into nutrients for your plants to access on demand.

Ocean Forest Potting Soil 3.0 cu ft


If you’re using store-bought potting mixes, these are already optimally “tuned” for growing. Different story if you’re growing organically, though. Natural soil comes in four varieties: sandy, silty, loamy, and clay. But know that the majority of soils contain varying ratios of those soil types.

For example, the soil could also be clay and loamy, or sandy and silty.


Sandy soil is coarse with good drainage but has poor water retention. When watered, nutrients like nitrogen also will quickly get washed away. Sandy soil is simple to figure with and could be a viable choice for cannabis growers.

  • Coarse structure
  • Low pH
  • Pros: Good drainage, keeps soil airy, high oxygen levels, easy to figure with
  • Cons: Poor water retention, needs frequent watering


Silty soil could be a medium-coarse soil type that’s rich in minerals and organic particles. Its water retention is sweet, yet it’s adequate drainage. Silty soils are very easy to figure with. The minerals and organic substances within make it one of every of the foremost fertile soil types.

  • Medium-coarse
  • Pros: Contains minerals and nutrients, retains water well
  • Cons: Fair drainage


Loamy soil could be a combination of sand, silt, and clay soils with added organic compounds. it’s one of the simplest soil types for growing cannabis because it offers optimal water retention and drainage, and it’s rich in nutrients and oxygen. Downside: this kind of soil is often expensive.

  • Mixture of sand, silt, and clay
  • Pros: Excellent water retention and drainage, contains nutrients, high oxygen levels
  • Cons: Expensive


Clay soils incorporate fine mineral particles. this kind of soil is heavy and hard to figure with. it’s very rich in nutrients and minerals, which makes it an honest choice to include in organic grows. Clay soil retains water well but has poor drainage.

  • Fine particle size
  • High pH
  • Pros: Rich in nutrients, retains water
  • Cons: Poor drainage, heavy and compact, hard to figure with


If you’re working with natural soil, the likelihood is that it won’t be perfect for growing cannabis—not from the beginning, at least. the feel might not be optimal or it’s going to have poor drainage, as an example. But you’ll be able to improve any style of soil by adding amendments, most of which might be found in your local grow shop.


Coco coir (coco fiber) is created from coconut husks. These light fibers provide excellent water retention and might lighten compact soils. Some use a pure cocoa substrate with special nutrients to cultivate their weed. But to amend existing soil, it’s a decent idea to feature anywhere up to 30% coco coir, reckoning on the composition of your base soil.


Perlite is that the most generally used soil amendment. Perlite consists of Very light, bright-white rocks that greatly improve the drainage and airiness of the soil. Perlite also has decent water retention. To amend your soil with it, add 10–15% of perlite. you’ll be able to add more, then again your soil may become too light and nutrients may leach out. Good-quality commercial soils often include added perlite.


Most cannabis growers are conversant in using clay pebbles as a part of a hydroponic setup. But did you recognize they’ll even be wont to enhance soil structure? Adding clay pebbles to the underside of your raised beds and containers will assist with drainage and stop water from pooling at the base—a large risk factor when it involves plant disease.

Growers can even add clay pebbles to the highest of containers and beds to function as a mulch. Here, they assist to trap moisture within the growing medium by preventing excess evaporation. Clay pebble mulch also casts shade over the highest layer of soil, suppressing weeds and keeping beneficial microbes sheltered from the new rays of the sun.


Vermiculite, a bit like perlite, could be a heat-treated mineral you’ll be able to use to create your soil lighter. It is also excellent at retaining water. Although vermiculite shares some characteristics with perlite, the 2 have opposite uses: Use perlite to extend drainage and airiness, and use vermiculite to extend water retention. Luckily, you’ll use both, as perlite and vermiculite work well together. Around 10% vermiculite is useful.


Worm castings are normally seen more like a nutritional soil amendment as they contain a plethora of useful microorganisms that benefit growth. But worm castings also will improve the feel, drainage, and water retention of your soil. When amending your soil with worm castings, use about 25–30%.


If your DIY cannabis soil is rich in organic material, you’ll likely not have to add nutrients to that. As a matter of fact, some growers make the error of adding manure and vegetable scraps to their soil to “fertilize” it. This leads to soil getting “too hot” for the plants, hurting their development successively. If you would like to place your vegetable scraps to good use in your garden, you initially must compost them.

If you think that you wish to amend your cannabis soil with nutrients, you’ll be able to easily purchase bottled solutions tailored to a plant’s phase of growth like Mykos


One factor to think about when choosing the proper soil for your weed is whether or not you’re growing photoperiod or auto-flowering plants. Autoflowers prefer a lightweight mix with fewer added nutrients. a good substrate for your auto-flowering ladies could be a 50:50 mixture of coco coir and a lightweight, peat-based soil with some added perlite for drainage.

When growing autoflowers, stand back from heavily fertilized soils and certain amendments like bat guano, as these are going to be too hot and overload your plants with nutrients. the identical is true for cannabis seedlings, which don’t like high levels of nutrients.

Plant autoflowers within their final growing container during a cup-sized hole in the center of the soil. Fill the outlet with seedling/starter soil with no nutrients and place your seed in it. This way, your seedling can grow without being surrounded by the recent soil, which might otherwise burn it.

For photoperiod plants, start them get in small seedling pots/cups with soil that has little to no nutrients. Replant after some weeks. More mature plants will tolerate higher nutrient levels far better than seedlings.


If you’ve just started growing cannabis, it should be best to easily get ready-made soil from the grow store. the rationale for this can be that good-quality cannabis soil normally contains everything your plants need for healthy growth, within the optimal ratios. If you wish, you’ll further improve your store-bought soil with a couple of perlite for increased drainage, but otherwise, you ought to be good.


On the opposite hand, there may come a time once you want to create your own soil. After all, why spend good money on the soil if your homemade version is even better? Here could be a recipe for a basic homemade cannabis soil.


  • 1 part vermiculite
  • 1 part coco coir peat
  • 2 parts compost
  • ½–1 cup worm castings (or humus)


  1. Sieve the compost to get rid of larger chunks.
  2. Soak the coco coir peat in warm water. Check the directions of the merchandise to determine what quiet volume you may be getting.
  3. Use a bucket and blend the coco coir peat with vermiculite.
  4. Add the compost.

Done! Double-check the pH value of your homemade soil. It should be within the range of 5.8–6.3.

The above could be a basic soil recipe that may serve you well for many grows, indoors and outdoors. But you’ll further enhance your soil mix by adding organic fertilizers.

Bat guano is a superb and cheap organic for flowering marijuana. you’ll be able to add it to a soil mix or spread it on the topsoil and water in later. you’ll also consider time-release nutrients like Easy Boost Organic Nutrition pellets. Add a cup of those to your soil to feed your plants for or her whole life cycle—100g is enough for 2–3 cannabis plants. All that’s left to try to to is water!


If you’re growing outdoors in a very hot climate like Southern Spain or an identical location, you don’t want to “cook” the foundation zone of your plants. If you’re using pots, choose white plastic containers, as this helps to stay the soil temperature at an affordable level under the beating sun. you’ll also look to air pots or smart pots to stay the roots of your cannabis plants cool. As a further measure to safeguard the soil from fluctuating temperatures, you’ll add layers of dry straw onto the topsoil.

If you’re growing in drought conditions where your plants may now and then go weeks without rain, or if you can’t make daily trips to your guerrilla grow location, use water-absorbent polymers to stay hydrated! you’ll be able to get these from hydroponic grow stores or can cut them out of diapers.

For a guerrilla to grow in dry conditions, dig a hole about 60cm deep and 30cm in diameter. Add some cups of polymer crystals to the underside of the soil mix and top off with the remaining soil. Place your plant into the soil and water liberally. As your plant grows, the roots will soon reach the polymers so it can drink even during drought. Tip: Soak the polymers in an exceedingly light nutrient solution for a double benefit!

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