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The quality of your soil influences everything from the size of your cannabis plants to the potency of your buds—which is why finding the best soil for cannabis is so essential. Your run-of-the-mill bag of dirt from a big box store won’t cut it (please DO NOT use Miracle Gro 🤮). You need good cannabis soil that has the right nutrient ratios, pH balance, and materials for cannabis cultivation.
There’s a lot to factor in during a cannabis soil search, but we’ve done the legwork for you. Below is a rundown of the best options on the market that your plants will love.
My top picks
Cannabis plants can be, well, a little picky when it comes to their growing environment. But these top-of-the-line soils have got them covered, delivering the perfect mix of nutrients, pH balance, and materials for a successful cannabis crop.
1. BEST OVERALL: Super Soil Autoflower Concentrate
This living soil is teeming with microorganisms and fungi that will deliver key nutrients to your plants from seed to harvest.
Product Specs
- Size: This bag comes with five pounds of soil mix.
- Type: This is an autoflowering, living soil.
- NPK: There is no NPK value listed because the microbes in the soil provide nutrients to plants as they need them.
Some cannabis growers like to DIY their cannabis soil, adding mixtures of various nutrients and amendments to create the perfect recipe for their plants. But if you want something a little less hands-on, look no further than Super Soil Autoflower Concentrate.
This all-in-one soil mix is alive with microorganisms that form a symbiotic relationship with your plants’ root system. This means that key nutrients are readily available to your plants throughout their entire life cycle, from seedling to harvest. As one reviewer who saw “very measurable gains” using this soil puts it, “mix, plant, water. That’s it.”
It’s the best potting soil for growing cannabis, start to finish.
A hefty stench is the only downside to this almost set-it-and-forget-it soil mixture. But if you can get past the smell, you’re in for some seriously healthy plants—and a seriously chill growing experience.
Pros
- Delivers nutrients as needed
- Very easy to use
- High-quality bud results
Cons
- Smell is very potent
2. BEST LIVING SOIL: FoxFarm Ocean Forest Potting Soil
With a rich blend of earthworm castings, bat guano, and micronutrients, this potting soil feeds your buds —without breaking the bank.
Product Specs
- Weight: The size of the bag is unclear, but it seems to be 40 quarts.
- Type: This soil is a mix of loam, humus, and moss.
- NPK: The NPK is not listed.
Fox Farm is a beloved classic for a reason: it’s reliable soil quality, easy to use, and boasts a lengthy list of satisfied customers. This potting soil is perfect for first-timers (or those who don’t want to mess with mixing their own formulas) and is enhanced with mycorrhizal fungi and beneficial microbes.
FoxFarm Ocean Forest Potting Soil is a premium choice for cannabis cultivation, offering a host of benefits that make it stand out in the market. This high quality soil mix is a favorite among cannabis growers due to its ease of use and suitability for all stages of plant growth, from seedlings to mature plants.
One of the key advantages of FoxFarm Ocean Forest is its pH level, which is already adjusted to the ideal range of 6.3 to 6.8. This optimal pH range facilitates efficient nutrient uptake, leading to vigorous growth in cannabis plants. This feature eliminates the need for growers to invest in a pH pen, making the soil incredibly efficient and user-friendly.
The organic soil mix is enriched with premium earthworm castings, bat guano, seagoing fish, and crab meal, providing a rich and nutritious environment for cannabis plants. It also contains forest humus, sphagnum peat moss, and sandy loam, which contribute to the soil’s texture and water-holding capacity. However, it’s worth noting that some growers may find the need to add supplemental cannabis nutrients during the flowering phase or additional perlite for aeration.
While FoxFarm Ocean Forest Potting Soil may come with a higher price tag compared to other organic potting soils, its benefits and the convenience it offers make it a worthwhile investment. The two-pack offering provides additional value, especially for cultivators planning for larger or multiple grows.
FoxFarm Ocean Forest Potting Soil is an ✨ excellent choice ✨ for those seeking a high-quality, easy-to-use living soil mix for cannabis cultivation. It’s especially perfect for those new to growing cannabis plants!
Pros
- pH adjusted to allow for optimum fertilizer uptake
- Contains premium earthworm castings, bat guano, seagoing fish, and crab meal
- Simple to use
- Ideal for all stages of cannabis plant growth, from seedlings to mature plants
Cons
- Soil does not contain enough perlite for aeration, which is crucial for cannabis root health
- Requires supplemental nutrients during the flowering phase of cannabis growth
3. BEST ORGANIC: Purple Cow Organics IndiCanja Organic Compost Soil
Cut back your carbon footprint and grow some premium flower with this plant-based, no-water formula.
Product Specs
- Weight: This bag weighs 15 pounds.
- Type: This type of soil is humus.
- NPK: The NPK ratio is 0.8:0.8:0.8.
You don’t need to be a hippie to appreciate the appeal of this sustainable, earth-friendly potting soil. Purple Cow’s IndiCanja Organic Compost Soil is made entirely from plant-based ingredients, so it’s rich in nutrients and ready to use right out of the bag.
It’s a cannabis-friendly mix of minerals, compost, and organic matter not only increases your plant’s health, yield, root mass, and biodiversity but also ups their natural water uptake. The result is some seriously dank buds—and a reduced carbon footprint to boot.
Some reviewers complained of gnats, but that may be more of an overwatering problem than anything else. If you’re looking for an eco-friendly option that doesn’t skimp on quality, this is the soil for you.
Pros
- Plant-based ingredients and materials
- Only requires water (no fertilizer)
- Increases plant health and yield
Cons
- May attract bugs
- On the expensive side
4. BEST FOR MIXING: Roots Organics Formula 707
If you love to get your hands dirty, this organic potting mix is perfect for customizing your own soil recipe.
Product Specs
- Weight: This bag weighs about three pounds.
- Type: This mix is made of peat moss and potting.
- NPK: The NPK is unlisted.
Is there anything more fun than playing in the dirt? We think not. If you’re into creating your own cannabis-friendly formulas, then you’ll want to pick up a bag (or three) of Roots Organics’ Formula 707.
Everything about this mix is top-notch and ready for DIY, from the fewer nutrients to the soil bags that double as pots. And while you’re free to “control your own destiny” with this organic growing media, the included mycorrhizal fungi will help give your roots a boost by increasing their biomass and helping them better resist the stress of container growing.
Be warned: bugs are a common complaint, but sterilizing the soil prior to planting should kill off any unwanted critters.
Pros
- Beneficial Mycorrhizal fungi included
- Bags double as pots
- Great for customizing mix
Cons
- Bugs may be an issue
- Some extra prep work required
5. BEST FOR FIRST-TIMERS: FoxFarm Happy Frog Potting Soil
Newbies and old-timers alike will appreciate the convenience of this nutrient-rich potting soil.
Product Specs
- Weight: This bag weighs 45 pounds.
- Type: This type of soil is humus.
- NPK: The NPK needs to be clarified.
Happy Frog is a beloved classic for a reason: it’s reliable, easy to use, and boasts a lengthy list of satisfied customers. This potting soil is perfect for first-timers (or those who don’t want to mess with mixing their own formulas) and is enhanced with mycorrhizal fungi and soil microbes.
Already pH adjusted for maximum nutrient uptake, you can toss this soil straight into the pot without any extra prep work. Just add water and plants, and you’re good to go. Reviewers love how well it holds water, how much soil you get per bag, and how gorgeous their buds look after using it. Just ask one reviewer who said it “will give your flowers a boost they need to be absolutely beautiful!”
Pros
- pH adjusted for nutrient uptake
- No extra prep work required
Cons
- Some complaints of gnats
My verdict
All the options on this list are stellar, but there are two clear winners: Super Soil Autoflower Concentrate and FoxFarm Ocean Forest Potting Soil. Both bags are rich in nutrients, easy to use, and come in large sizes— everything you need to grow healthy, vibrant cannabis plants.
Our recommendations
| # | Preview | Product | |
|---|---|---|---|
| 1. |  |
BEST OVERALL: Super Soil Autoflower Concentrate | view on amazon |
| 2. |  |
BEST BANG FOR THE BUCK: FoxFarm Ocean Forest Potting Soil | view on amazon |
| 3. |  |
BEST ORGANIC: Purple Cow Organics IndiCanja Organic Compost Soil | view on amazon |
| 4. |  |
BEST FOR MIXING: Roots Organics Formula 707 | view on amazon |
| 5. |  |
BEST FOR FIRST-TIMERS: FoxFarm Happy Frog Potting Soil | view on amazon |
How I chose the best soil for cannabis
Dirt is dirt, right? Not quite. When it comes to cannabis, the type of soil you use can make a big difference in the health and yield of your plants.
To help you find the best soil possible, I looked at nutrient content, ease of use—the less DIY-ing, the better—and bag size. After all, nobody likes running to the store for more soil every other week.
I also included my recommendations based on experience and what has worked for me in growing cannabis plants. (You can see allllll of my experience and recommendations here: Cannabis Archives)
I also considered customer reviews, paying close attention to those that mentioned plant health. While every bag of soil is vulnerable to bugs and smells, I only considered those that had the fewest complaints in these areas.
What kind of grower this product is for
Despite its intimidating nature, anyone can grow cannabis. Finding the right soil is really just a matter of understanding your strains’ needs and deciding how much extra mixing and measuring you’re willing to do. Because there’s a huge selection of ready-to-use soils on the market, I recommend starting with one of those if you’re new to the marijuana-growing game.
What to know before you buy potting soil for your marijuana plants
Growing cannabis is kinda like baking a cake—you need the perfect mix of ingredients to create something magical. And soil is the foundation of a great grow.
The best soil for cannabis will have the perfect mix of nutrients, pH balance, and composition to support your plants through every stage of growth—and there are multiple materials you can use to achieve that perfect mix.
Types of Soil Texture and Its Impact on Cannabis Growth
You can’t just slap any ol’ dirt in a pot and expect your cannabis to thrive. The type of soil you use can make or break your crop, so it’s important to do your research and find the perfect mix for your plants. Below are some of the most popular types of soil for growing weed.
Soil vs Potting Mix
When it comes to growing cannabis, understanding the difference between soil and potting mix is crucial. Soil is the natural layer of earth that covers the surface of the ground, consisting of a mixture of minerals, organic matter, water, air, and microorganisms. It varies in texture, pH level, and nutrient content depending on its location and composition. On the other hand, potting mix is a man-made growing medium specifically designed for container gardening. It’s made from a blend of organic matter such as peat moss, composted bark, and coconut coir, along with other ingredients like perlite or rice hulls. These components are mixed to create a lightweight, well-draining growing medium that provides the right balance of nutrients and moisture for container-grown plants.
One of the main differences between soil and potting mix is their weight and density. Soil is heavier and denser due to its mineral content, which is broken down from rocks.
In contrast, potting mix is lighter and fluffier, designed for container-grown plants. The texture of the soil, which is determined by the size of the rock particles it contains, influences its water-holding abilities and drainage. For instance, sandy soil drains quickly, silt soil holds moisture well, and clay soil is dense and can become compacted, making it difficult for water to penetrate.
For cannabis cultivation, loam soil, a mix of sand, silt, and clay, is considered ideal as it provides good drainage, water retention, and is easy to work with.
However, potting mixes based primarily on the organic fraction of soil can also be beneficial. They might not contain as many minerals as soil, but they can be improved by increasing soil organic matter through cover crops, manures, and compost.
Living soil, a popular option for cannabis growers, contains microorganisms and beneficial bacteria that help break down organic matter and release nutrients to the plants over time. This type of soil is highly sustainable and promotes healthy plant growth. It typically contains organic fertilizers that are broken down over time by microbes, providing slow-release nutrients to the plants.
Loam
By far the most highly recommended type of soil for cannabis, loam is a mix of sand, silt, humus, and clay. This combination is uber fertile and provides plants with the drainage they need to prevent root rot while also holding enough moisture and nutrients to support growth. You can never go wrong choosing loam.
Humus
This organic ingredient of outdoor soil is what you’ll find at your neighborhood gardening shop. While some people refer to it as compost, it’s actually not quite there. Compost is the final product of the decomposition process, while humus is just one organic matter added into compost. It’s a great option, but just know that even though many humus soils claim to be bug-free, you can usually find at least one or two critters.
Moss
As it turns out, the layer of leaves, twigs, and other decomposing organic matter that you find on the ground in forests are actually great for growing weed.
Moss—particularly sphagnum and peat moss—is dense yet airy and has an uncanny ability to absorb and retain nutrients. It also helps to keep the soil moist, making it an ideal growing medium for cannabis.
pH
Marijuana plants are very particular about the levels of acidity and alkalinity in their soil. Striking the perfect pH balance is essential to ensuring a healthy, robust crop. The general scale runs from 0 (very acidic) to 14 (very alkaline). Guess where your plant’s preferred pH range falls? Right in the middle, at 7.
To achieve the ideal middle-of-the-road pH level, look for soil that has pH 7 labeled clearly on its bag. You might also want to grab a cheap pH monitor to check the level periodically throughout the grow cycle so you can make adjustments as needed.
Nutrients: Living Soil and Slow-Release Nutrients
If you want to be the ultimate cannabis plant parent, commit the following acronym to memory: NPK. It stands for nitrogen, phosphorus, and potassium.; A.K.A., the vital nutrients your indoor nursery needs to survive and thrive.
While you can always use a fertilizer that contains all ingredients, it’s much easier to cut out the additional step and find soil that already has them mixed in. Most high-quality potting soils will have NPK values listed on the front of the bag so you can make an informed decision. The best combinations are 20:20:20 and 12:12:12.
One way to support nutrient uptake and plant health in general is the use of living soil and slow-release nutrients. Living soil is a type of soil that is teeming with beneficial microorganisms and bacteria. These tiny life forms help break down organic matter in the soil, gradually releasing nutrients to the plants over time.
This process of slow nutrient release mimics the natural nutrient cycle found in the earth’s soil, providing a sustainable and balanced nutrient supply for your cannabis plants. Living soil not only enhances the nutrient availability for the plants but also contributes to the overall health of the soil ecosystem, leading to robust and vigorous plant growth. This approach to soil management can lead to higher quality cannabis, with improved flavors and aromas, making living soil a popular choice among many cannabis growers.
Composition
You want the composition of your soil to be a bit like Goldilocks porridge—not too moist, not too dry, but just right. Anything too wet will block airflow and lead to root rot. Too dry, and your plant’s growth will be stunted.
There will be a label on the bag that states whether the soil is wet or dry, but it’s always a good idea to test it out for yourself. The perfect mix will have a crumbly texture that is loose but feels slightly heavy. You can mix the different soil types above to get that perfect consistency.
Tips for mixing soil for cannabis
As nice as it would be, there is no perfect mix of soil for cannabis. Different strains have different nutrient requirements. So a great deal of your plants’ success depends on how well you understand their individual needs.
Most strains fall into three categories: needing high levels, normal levels, and low levels of nutrients.
- If your strain falls into the high category, you’d do best with soil that had a 20:20:20 NPK ratio.
- Normal levels require a little fewer nutrients with an NPK ratio of 10:10:10.
- And, of course, low levels require much less. A 5:5:5 NPK ratio is plenty.
If you really want to get geeky with your grow, follow these other tips for mixing soil:
- Really get to know the specific needs of the strains you’re using so you can choose a soil mixture that will support them throughout the entire grow cycle.
- Mix different soil types together to create a custom blend that meets the specific needs of your plants.
- Never bring natural outdoor soil into any indoor growing operation because bugs and other nasty pets can totally comprise your crops.
FAQs
Growing cannabis is by no means an easy hobby. It takes time, patience, and a fair bit of knowledge to get it right. But if you put in the effort, you will be rewarded with some of the best herb around. Below are some answers to common questions about cannabis soil to help you get started.
What is the best soil for growing cannabis?
It depends on the specific strain you’re growing. But loam with a 20:20:20 NPK ratio is a good place to start.
What is the best store-bought soil for cannabis?
Overall, Super Soil Autoflower Concentrate is the best store-bought soil for cannabis. It requires no additional nutrients, and it has everything your plant needs to thrive.
Can you grow cannabis in regular potting soil?
No, you cannot grow cannabis in regular potting soil. Cannabis has specific nutrient requirements that regular potting soil does not provide.
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Marquis *wants* to know how to keep happy and healthy plants, but had a hard time finding information that wasn't written by just another copywriter. After nearly losing one too many plants, it was time to take matters into her own hands. A team of plant scientists and nursery hands was brought together and The Indoor Nursery was born.
