The best self-sufficient cannabis growers consider the basics. Pick up your seeds and get ready to get your hands dirty.

Your marijuana plants success depends entirely on the type of growing medium you choose. Most people would probably consider garden soil mixture because it is freely offered by Mother Nature.

However, if you want a growing medium that will deliver surefire results, you should consider buying good soil for weed.

Before you research local or online vendors, make sure you go through our product recommendations and buying tips to help with your selection.

CannGrowBark Fines, Compost, Diatomaceous Earth, Worm Casting, Perlite, Pumice, Peat, Coir and BiocharYes
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Foxfarm Ocean ForestMoss, Forest Humus, Crab And Sea-Going Fish Meal, Bat Guano, and Earth CastingYes
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Organic SuperGuano, Kelp Meal, Alfalfa Meal, Fish Bone Meal, Blood Meal, Aloe Vera, Coconut Water Powder, Epson Salt, Azomite, and Dolomite LimeNot Stated
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Foxfarm Happy FrogForest Humus, Bat Guano, and Earthworm CastingsYes
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Espoma SS8Earthworm Castings, Peat Humus, Perlite, Sphagnum Peat Moss, and LimestoneNot Stated
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Top 5 Soils for Growing Weed

#1 CannGrow Premium Cannabis Soil Mix

If you are in the market in search of the best soil for THC weed in 2019, look no further than the CannGrow Premium Cannabis Soil Mix.

This unique soil mix for cannabis plants and berry growing has all the organic and natural input material needed for growth.

It is a natural blend of bark fines, compost, diatomaceous earth, worm casting, perlite, pumice, peat, coir, and biochar. It also has mycorrhizae as an organic amendment.

The light, as well as the aerated texture of the CannGrow, is mainly attributed to its exceptional blend of elements.

This rich soil mix is ready to use out of the box and ideal for different growing containers. Not to mention that it offers a perfect combination of water retention, drainage, and aeration.

According to field trials, the presence of biochar reduces water and fertilizer intake frequency, while increasing production.

What We Like

  • Contains biochar, eliminating the need for fertilizers
  • Organic amendments provide the top soil with an aerated and light texture
  • Offers a superior combination of water retention, aeration, and drainage
  • It is compatible with different growing containers

What We Don’t Like

  • It is quite expensive if you have a tight budget

#2 Foxfarm Ocean Forest Garden Potting Soil

This Foxfarm soil is a completely natural potting soil for weed. It is the ultimate growing medium with everything your weed needs in a single bag.

The Foxfarm Ocean Forest features a blend of moss, forest humus, crab and sea-going fish meal, bat guano, and earth casting among other elements.

Unlike conventional growing mediums on the market, this soil is pH adjusted from 6.3 to 6.8. This ensures optimal fertilizer uptake for superior growth.

This medium comes fully-equipped with all the elements and fertilizer your weed plants need. So, there is no need of adding fertilizer. Let the marijuana plants use what’s in the soil.

It is specifically formulated to promote healthy, sturdy growth and strong branching. Also, it is ready to use and suitable for containerized planting.

What We Like

  • pH adjusted from 6.3 to 6.8 for optimal fertilizer intake
  • Contains a powerhouse blend of natural materials
  • Does not require you to use nitrogen fertilizers
  • Promotes branching and healthy growth

What We Don’t Like

  • Bags are of inferior quality, may get damaged

#3 Organic Super Soil Concentrated Strength

At #3 on our list of the best soil for weed is the Organic Super Soil by Nature’s Living Soil. This is a suitable choice for growing cannabis indoors.

It contains the necessary ingredients your cannabis plants require, including bat guano, kelp meal, alfalfa meal, fish bone meal, blood meal, feather meal, Aloe Vera, coconut water powder, Epson salt, azomite, and dolomite lime.

In addition, the soil contains the following microorganisms: Glomus etunicatum, Glomus Aggregatum, Trichoderma, and Pisolithus Tinctorius to mention a few.

With the presence of super ingredients and important microorganisms, you don’t have to add anything else except enough water for healthy growth.

If you are planning to use this soil mix in a grow tent, you will most certainly need carbon filtration to deal with the smell.

What We Like

  • Numerous microorganisms for superior microbial action
  • Soil pH remains within the normal range when you use rainwater
  • You may not need fertilizer, thanks to the super ingredients
  • Ready to use with containerized planting

What We Don’t Like

  • Smell is a little bit awful for grow tent planting

#4 Foxfarm Happy Frog Potting Soil

When it comes to weed growing Foxfarm understands you better. The Foxfarm Happy Frog Potting Soil provides the necessary fungi and microbes required for breaking down organic matter.

This soil mix, only features premium, high quality ingredients, including forest humus, bat guano, and earthworm castings for ultimate growth performance.

Unlike other potting soil mixes on the market, the Happy Frog guarantees a dynamic vegetative stage growth, strong plant structure, and improved flowering stage and fruit production.

Apart from being properly aerated, this growing medium has a fine texture with an adjusted pH for exceptional plant growth.

What We Like

  • Presence of fungi and microbes for breaking down organic matter
  • No fillers, only healthy ingredients are included
  • Vigorous vegetative growth and strong plant structure
  • Convenient for containerized planting
  • pH adjusted for optimal results

What We Don’t Like

  • Defective bags may contain fungus

#5 Espoma SS8 Organic Seed Starter

Coming last in our list is the Espoma, which is one of the best potting mixes for containerized weed planting. It ensures your plant grows twice as big.

This soil mix is formulated from earthworm castings, peat humus, perlite, sphagnum peat moss, and limestone.
It also contains several active ingredients, including Scleroderma citrinum, Scleroderma cepa, Rhizopogon luteolus, Rhizopogon fulvigleba, Rhizopogon amylopogon, and Pisolithus Tinctorius.

Espoma is an all-natural soil mix that is enhanced with myco-tone to not only improve moisture retention but also promote root system growth.

What We Like

  • All-natural ingredients enhanced with myco-tone
  • Fast and effective seed germination
  • Promotes root growth
  • Improves and increases water and nutrient uptake
  • It is a starter mix that doesn’t require additional fertilizer

What We Don’t Like

  • Defective bags may contain mold on arrival

What to Consider when Choosing Soil for Weed?

Choosing the right soil for growing weed does not have to be a difficult proposition. You just have to select a growing medium that will be favorable.

Popular Types of Soils for Weed

The most popular types of soils that you will come across include clay, silt, sand, and loam. Clay and adobe soils may not be the most favorable for growing weed.


This growing medium consists of nutrients that weed needs, but its particles tend to stick tightly, interfering with aeration that is needed for the absorption of nutrients.

The compactness of the soil prevents water from reaching the roots of the plant. If you consider the aforementioned factors, clay may not be a good choice for growing weed.


This medium can be very difficult to amend since it has superior drainage. Your plant will lose the nutrients as water carries them away.

This medium is very wasteful of water and makes it difficult to know how much water your weed plant is actually receiving.

Sandy soil needs amending by adding organic materials. If you will be using this medium, you should consider growing your weed in containers first before transferring them to the garden.


This is one of the most suitable soil. It retains water and nutrients, which are easily accessed by the plant. This soil is remarkably easy to work with.

Loam consists of twenty percent clay, forty percent silt, and forty percent sand. This is a superb combination of weed.

Potting Soil

This is a fresh-out-of-the-bag growing medium, which usually fulfills all of the needs for the soil for weed.

Potting soils are normally formulated to retain water and air evenly. They drain well and allow for easy root penetration.

There are two types of potting soils: organic and conventional. The organic type is eco-friendly since it contains worms, decaying plant material, and microorganisms that add minerals and nutrients.

The conventional one contains elements, such as black hummus, manure, and peat. All the nutrients, as well as fertilizer in non-organic potting soils, are artificially included.

The most popular potting soils are soilless mixes. These are inexpensive, lightweight sterile growing mediums, which are quite common in commercial nurseries.

Generally, the mixes are made from a number of materials, including coconut coir, peat moss, sand, perlite, vermiculite, and pumice among others.

We highly recommend the pre-mixed soilless mix. It allows for strong root penetration and even growth of weed. This soil allows you to easily control pH, moisture content, and fertilizer concentration.

The Needs of the Weed Plant

The very first thing you have to do is identify the needs of your plant. For example, you need to know the amount of moisture weed requires among other things.

Water Requirements

Weed flourishes in well-drained soil with an adequate supply of water. Usually, the plant grows large in an irrigated habitat but is stunted by aridity.

Standing water is quite harmful to weed, since the roots may easily suffocate. As a result, porous organic soil with high sand content and moderate slope seem best suited for proper growth. During germination, the seeds have to be in continuous contact with moist soil.

Choose the Right pH Value

The pH is a measure of how acidic or alkaline the soil may be. It scale runs from zero to fourteen, with seven considered neutral.

The pH determines the solubility of nutrients as well as affects the weed’s regulation of its nutrient uptake and metabolism.

Slightly acidic soils with a pH that ranges from around 5.8 to 6.5 can be considered friendly for this plant.

The pH of the soil you choose affects nutrient solubility. Soils with a higher level of organic matter do usually contain nutrients that are soluble between 5.0 to 6.5 pH levels.

Nutrients tend to be quite soluble in slightly acidic to highly alkaline soils. Use a pH meter to accurately test the soil pH level.

Soil Texture

Soil texture is normally determined by the physical state and size of the growing medium. The ideal soil texture is needed for effective root penetration, water retention, and drainage.

Soils that are made of fine mineral particles are adobe or clay. The particles in these types of growing medium do normally stick together tightly when wet, causing poor root penetration and water retention.

Sandy soils have larger particles, which allow for good aeration, root penetration, and drainage. However, they have poor water retention.

You can know the soil texture by picking up a handful of moist soil and then squeeze it gently in your palm. The soil should hardly stay together. Avoid growing mediums that stick together tightly.


Regardless of how well the growing medium is prepared; the soil must have good drainage. Clay or hardpan soils do not drain properly.

You need to fill your garden or pots with soil that has been amended with nutrients and additives. You can always settle for planting mix.

Final Words

Is it your first time to grow weed? If it is, then you are likely to come across numerous brand names and models in your search for the best soil for weed.

Don’t be overwhelmed. Start by considering the most basic factors, such as soil type. Then, go ahead and look at microorganisms, nutrients, pH, texture, water retention among other things.

Some of the popular terminologies you will come across include: perlite, plant food, bone meal, compost, peat moss, bat guano, and worm castings.

They are just amendments that are normally listed on the various soil types. Heavily amended growing mediums may have a long list of organic nutrients.

The soils we have selected for you will provide your weed plant with sufficient nutrients needed for most of its growth cycle and life cycle. In fact, these soils may not need any amendments.

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