Best Soil For Marijuana Seeds


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Your access to this site has been limited by the site owner If you think you have been blocked in error, contact the owner of this site for assistance. If you are a WordPress user with Soil is the most common medium used when cultivating weed. But with so many options to choose from what is the best soil for growing weed? In this article we give you all the information you need to choose the right mix for you. If you have an indoor cannabis grow set-up, you need the best soil for growing weed indoors. Our guide dives into what factors to consider and the best ones.

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Best soil for growing weed

For cannabis. you’ve got to nourish to flourish, and it all begins with the roots or base of your plants. Using soil is one of the most popular growing mediums, and is ideal for beginner growers. But, choosing the right or best soil for marijuana is key. The type of cannabis soil you choose can not only affect your plant’s life cycle of growth, but your end yields at harvest time too. So, what is the best soil for growing weed? We’ll answer that question and more in our in-depth guide to the best soil for cannabis growing.

The Pro’s and Con’s of Growing in Soil

With the emergence of hydroponic growing, many cannabis growers are now asking – to grow in soil, or not to grow in soil? Like many of the factors that go into growing healthy marijuana plants, your soil is just another that will be just as important to choose. Of course, there are pro’s and con’s of going with cannabis soil as a growing medium, so we’ve compiled a simple breakdown to best understand.

Pro’s of Growing with Soil

Hydroponics systems can be expensive, so the first advantage of growing in soil is the simplicity and cost-effectiveness. Plus, it’s likely you have prior knowledge of how to grow in soil since most plants besides cannabis are grown in such a way. The ease of growing in soil is ideal for beginner growers, which is why it’s more popular than most other growing mediums. Overall, soil is easier to maintain, more forgiving with any mistakes and can help boost the flavours of your final product, too.

Con’s of Growing with Soil

With dirt, comes pests, so that’s the first major con of growing in soil to consider. Soil is perfect for detrimental pests to hide and thrive in, so if going with this method you’ll want to ensure you’re buying new and clean bags of the type you choose. Additionally, soil can lead to slower growth when compared to hydroponics and can be hard to manage with big bags, and mixing balanced ratios. Last but not least, hydroponics are known to produce higher yields which is a con for many when choosing to grow with soil.

Factors to Consider when Choosing a Soil

To figure out which is the best soil for marijuana, you should understand the factors that soil lends to the health of a growing plant. To create an optimal environment for growth, soil traits that should be considered include –

  • Texture
  • Drainage
  • pH Value
  • Water Retention
  • Nutrients
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Types of Soil

Once you decide to cultivate using soil, that’s not the last decision you’ll have to make. Then, it’s time to choose what type of soil is best for your operation or the growth you’re trying to achieve. Luckily, over the years, the growing community has learned what works and what doesn’t. So, using this knowledge can help boost success from the start. The most popular types or textures of soil include –

  • Sandy soils – Sandy soils contain lower levels of pH which will help you along the way when balancing pH for nutrient uptake. Higher oxygen levels also make sandy soils, helpful for optimal growth. The granules are larger so sandy soils also help promote proper drainage and avoids compactness. On the flip side, better drainage means less water retention and can lead to sandy soils drying out more quickly than others.
  • Silt soils Silt soils have a smaller granular size compared to sandy, so conversely it retains water better, with less than ideal drainage. But, it naturally contains beneficial nutrients which can help stabilize plants for a more healthy growing environment.
  • Clay soils – Clay soils are the smallest in granular size in comparison to sandy, and silt, but comes with a higher pH level than most. It’s consistency may be hard to work with, but the material has a high level of beneficial minerals that promote healthy growth. Again, like silt, it retains water better than sandy soils, yet lacks in drainage.
  • Loam soils So, what happens when you combine soil types to benefit from the varying types’ individual advantages? That’s the purpose of loam soil. Cannabis plants flourish with mixed materials like loam soils provide. Due to the soil’s neutral pH levels, fertile nature, high oxygen levels, and ideal drainage and retention. The only downside, is loam soils can be more expensive in cost.

Soil Additives to Consider

After you’ve decided which soil to purchase, if it’s not a combination made specifically for growing weed – you can easily add materials to improve the base’s quality. Soil additives can improve drainage, increase water retention and the uptake of nutrients for optimal growth. The most popular items to add to soil, to do so are –


Perlite is white pebbles in varying size, that feel like styrofoam in consistency. When adding to soil, they help improve overall texture by better holding water and air. Perlite also helps improve drainage when using 10-20% in your soil mix.

Coco Coir

Coco Coir is a unique material that’s made of coconut husks. The consistency helps promote ideal water retention without causing the soil to become too heavy. Coco Coir’s biggest advantage is it helps the root of your plants develop more quickly. It is possible to grow your plants in strictly coco coir, but the soil can be costly. If creating a blend of soils, it’s recommended to add up to 30% of your final mixture.


Vermiculite is often used with perlite, and are similar in shape and color. The additive lightens the weight of the soil, while improving water retention.

Clay Pebbles

Clay Pebbles while often used with hydroponics, can also be added to your growing containers for unique benefits, too. Most growers place clay pebbles at the bottom base of their cannabis soil, which prevents water from pooling. This enhances overall drainage, and avoids root rot that can occur from poor drainage. Other growers add clay pebbles to the top of their soil mix, to trap moisture that would normally escape through evaporation. On top, clay pebbles also serve as ‘mulch’ hindering weed growth, and protecting beneficial nutrients from hot sun or lights.

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Worm Castings

Worm castings. or, yes, worm ‘poop’ is a highly beneficial soil additive used by a variety of gardeners and growers. It can help cannabis soil by enhancing the overall texture for better water retention and drainage. Worm castings, and other ‘icky’ materials like manure or compost naturally also contain beneficial nutrients like phosphorus, potassium, and nitrogen that slowly release over time.

Photoperiod Plants vs. Autoflowering

Of course, keep in mind that photoperiod plants will require differing soil content versus autoflowering plants. That’s because autoflowers require fewer nutrients overall for optimal growth. Plus, autoflowers are more finicky to stress, and high levels of nutrients can actually burn the seedling or early veg plants.

When mixing soil for autoflowers, an ideal mix to implement would be –

  • 3 parts peat moss
  • 3 parts compost
  • 2 parts perlite or coco coir
  • 1 part vermiculite

Best Recipe to Mix Your Own

There are many viable options for purchasing a ready-made mix of soil, specifically formulated for cannabis. But, when you make your own you can pick and choose which factors are most important to the health of your crops. If you’re looking to experiment with mixing your own soil, below is a simple base of ingredients you can follow for success.

Making your Own Cannabis Soil Ingredients –

  • 1 part potting soil – a high quality soil for the base, is recommended.
  • 1 part compost – you can purchase compost, or make your own at home. Adding worm castings with your compost is highly beneficial, too.
  • 1 part perlite or coco coir
  • 1 part vermiculite
Soil Matters for Growth

Overall, once you understand the in’s and out’s of how growing in soil works – it’s by far, the easiest and highly effective grow medium to implement. With the information you’ve gained today, now you can start your crop off on the right foot, with the best soils for growing weed. The more you learn about the factors and environments that can affect your operation, the better your plants can thrive.

Best Soil For Growing Weed Indoors

If you have an indoor cannabis grow set-up, you need the best soil for growing weed indoors. Our cannabis soil guide dives deep into the factors to consider when shopping for soil for pot plants including its drainage, water retention, and texture.

In addition, we list our favorite potting soil products for cannabis, so you can grow big and bountiful yields time after time.

Choosing the Best Soil for Indoor Cannabis Gardens

When shopping for the best potting soil for cannabis, there are few factors to consider. First, how many plants are you intending to grow? This will help determine the amount of soil you will need.

Above all, you want soil with plenty of nutrients, proper drainage, and good water retention. Here are some factors to consider when buying the best potting soil for weed.


The best soil for growing weed indoors includes an optimum mixture of silt, sand, and clay soil, known as loamy soil. Ideally, the mix should have about 40% silt, 20% sand, and 40% clay.

Make sure your plants get a loose and light soil texture to help with root growth and ensure oxygen gets to your roots.


Cannabis potting soil requires proper soil drainage. When watered, the soil should not hold the water too much to where it pools on the top. If you have bad drainage, your plants can be vulnerable to root rot and mold.

Water Retention

While you want soil with proper drainage, you also don’t want the water to completely flush through without allowing the roots to take in water and nutrients.

Water retention refers to your soils ability to hold water. The best soil for growing pot indoors has balanced drainage and water retention properties.

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PH refers to how alkaline or acidic solution is. Cannabis thrives in a soil pH range between 5.5 and 6.5. Deviating slightly from this range won’t cause too much damage but if it goes well beyond the range, you can get stunted growth, lower yields, and dead plants.


Nutrients are your cannabis plants life force. Most ready-to-use and organic soil mix for weed is packed with nutrients for your cannabis.

Keep in mind, the nutrients in your soil mix don’t last forever. At most, they can last a few weeks and require you to keep a close eye on any nutritional deficiencies or signs of overfeeding.

Best Soil for Growing Weed Indoors

1. FoxFarm Happy Frog Potting Soil

FoxFarm’s Happy Frog Potting Soil is ready-to-use for indoor and outdoor applications. Happy Frog potting soil features soil microbes such as mycorrhizae and humic acid to improve root growth and nutrient uptake.

Other goodies include bat guano, aged forest products, and earthworm castings. Keep in mind, this soil is designed for container planting.

Learn How To Grow Cannabis!

2. FoxFarm Ocean Forest Potting Soil

FoxFarm’s Ocean Forest Potting Soil features a robust blend of ingredients from the “earth and sea.” Its powerful ingredients include fish emulsion, aged forest products, earthworm castings, crab meal, and sphagnum peat moss.

Its sandy loam, aged forest products, and sphagnum peat moss give this soil a properly aerated texture that is sure to improve nutrient uptake. This soil is also designed for container use.

3. Super Soil Organic Concentrate

From Nature’s Living Soil, the Super Soil Original Organic Concentrate comes in a 1, 5, or 10 lb. bag. All you need to do is add your preferred organic potting media to complete your mix. It contains all organic ingredients that your plant will need to thrive.

Full of helpful microorganisms and fungi, this concentrate can produce the best-looking and tasting buds around. Ingredients include organic earthworm castings, bat guano, blood meal, bone meal, azomite, epsom salt, coconut water powder, kelp meal, alfalfa meal, and so much more.

4. FoxFarm Coco Loco Potting Mix

FoxFarm’s Bush Doctor Coco Loco is a coconut coir potting mix meant to recreate the tropical jungle floor. Light and airy, it does this by incorporating layers of exotic coconut palm humus which can hold more than its weight in water while still retaining great drainage characteristics.

Its ability to hold onto water will mean you wont need to water your garden as often. Water every few days for best results.

5. Big Rootz All-Purpose Potting Soil

Big Rootz’s All-Purpose Potting Soil features a professional-grade composition at a budget-friendly price. This cheap soil for growing weed is meant for indoors or outdoor gardens and has been Certified Green Clean (CGC).

A team of weed growers developed this high-quality formula that combines rapid-release amendments with medium and slow release for an optimal performance.

6. Roots Organics Rod Original Potting Soil

Roots Organics Original Potting Soil is ready-to-use for your indoor garden. Its formula is perfectly designed for aeration and water retention so you can feed your plants frequently for fast growth.

Plus, the soil bags can be used as pots. Simply cut off the top, add in your plant, and you’re set. Ingredients include coco fiber, perlite, peat moss, pumice, composted forest material, bat guano, worm castings, fish bone meal, and much more.

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