what is the best soil for weed seeds

If you’re planning on planting a large container cannabis garden outdoors, Roots Organics Formula 707 is a versatile and capable option. An organic soil designed with greater water-holding capacity, Formula 707 contains ingredients and beneficial microbes specific to using larger containers.

But just as important as what’s in this soil is what’s not: less perlite, less pumice, and fewer amendments. This makes Formula 707 a highly customizable soil, allowing you to add your topsoil and liquid nutrients at various growth stages depending on your cannabis plants’ needs.

If growing cannabis is an art, then the soil is the canvas, paint and even a little bit of the brush. As your “grow medium” (the material that your plants grow in), the balance of nutrients your soil contains shapes how your plants grow, how fast and abundantly they flower and how many buds they yield.

From planting seeds to harvesting buds, Nature’s Living Soil’s Organic Super Soil has you covered through cannabis’ entire grow cycle. Reviewers love the ready-to-use simplicity this soil provides: just plant, water and wait. For those growing on their own for the first time, this is one of the best soils you can buy.

At a price point that won’t put a hole in your pocket, Black Gold boasts all of the essential traits of a strong soil for growing weed. Its loamy mixture contains an optimal blend of pumice and perlite for hydration and microorganism development, and its balanced nutrient blend won’t burn young cannabis plants. Those features have won this soil praise from gardeners of all stripes, cannabis growers included.

Red’s Premium Biochar-Based Soil.

Designed for indoor and outdoor cultivation, Happy Frog potting soil takes care of young cannabis plants’ essential needs, from correct pH levels to balanced nutrients, including a vital combination of microbes and fungi from earthworm castings and forest humus.

If you’re digging through the literature on growing weed, you’ve probably seen the term “super soil” come up quite a bit. Coined by the legendary grower and seed producer Subcool, the term generally describes a neutral organic soil base that’s been enhanced with a comprehensive range of “amendments,” i.e., added nutrients and microorganisms. Using a super soil eliminates the need for liquid nutrients as your cannabis plants grow.

Red’s Premium is another all-in-one, ready-to-use soil blend. But what makes it one of the best soils for weed is its stand-out feature: biochar. Biochar is an amendment that excels at protecting and promoting the growth of bacteria, fungi and other microorganisms that are essential for root development and strengthening your plant’s immune system.

Cannabis plants spring up like a literal weed. But growing weed optimally — in a way that allows it to express its best traits and produce trichome-rich flowers — demands care, attention to detail and a bit of trial-and-error. At the same time, there’s no better way to develop a closer, more connected and more rewarding relationship with cannabis than growing some yourself. To get you started, here’s our list of the five best soils for healthy weed.

Fox Farm’s specialized line of soils for cannabis are some of the most widely acclaimed grow mediums available. If you’re beginning your grow journey from the ground up, Happy Frog is an excellent soil to nurture seeds and seedlings.

Your soil’s nutrients and the water you provide need to link up to be available for and absorbed by plants’ roots. Biochar, a carbon-rich charcoal amendment, not only facilitates this process but it also provides a large surface area for microorganisms to live and thrive. Red’s Premium Biochar-based soil thus creates an ideal “habitat” for all the living beings that help your cannabis plants reach their full potential.

Still, Formula 707 has enough nutrients to last 10-14 days before you need to add anything. And for convenience, you can use the soil bag itself as a pot. Just cut off the top, poke some holes in the bottom, plant your seedlings and you’re ready to grow.

The best soils for weed don’t always have to be products specialized for cultivating cannabis. Sometimes, a good organic potting soil is all you need, and Sungro’s Black Gold all-organic potting soil is an excellent case in point.

Every ingredient in Black Gold is organic, and it’s suitable for a wide range of environments, from patio containers to indoor hanging baskets. The bottom line: Black Gold is a reliable and high-performance base soil for cannabis. You can also get hands-on with this soil, since adding amendments as your plants grow is super easy.

Aurora Innovations Roots Organics Formula 707.

Fox Farm’s Happy Frog Potting Soil.

Nugbuckets is a famous organic soil grower! Check out his plants!

This plant is growing in Fox Farm Ocean Forest Soil.

If you are willing to keep transplanting to bigger pots as your plant uses up the nutrients in the soil, you don’t need to supplement with extra nutrients. However, even if you grow in the same pot from seed to harvest, Fox Farm offers a complete nutrient system that is also formulated for plants like cannabis and goes perfectly with their soil to make sure your plant is getting the right levels of nutrients throughout its life.

Espona Organic Potting Mix is found in many stores in the US, and works for growing cannabis!

This is what kind of soil to get if you don’t have any “good” soil available, but want something that is known to work for growing cannabis.

Organic Potting Mix.

Coco Coir.

Note: Don’t worry, there’ll be examples of good and bad soil in just a bit!

However, when growing with Super Soil, it’s a good idea to avoid watering too much at a time, as extra runoff waterwill drain away some of the nutrinets. Try to give just enough water to saturate the soil with very little extra coming out the bottom. Since you won’t be adding more nutrients through the grow, you want to conserve what’s in the soil!

The composting process creates a “living” soil that is full of microorganisms in the rhizosphere (area around the roots). Properly composted soil has nutrient sources that slowly break down over the course of your plant’s lifecycle. It very closely mimics what happens in nature.

Good Cannabis Soil Another light, rich soil mix with great drainage. Although there is a wood chip in this picture, for the most part the mix is completely composted and broken down. It’s normal to see some wood pieces in composted soil, but you don’t want to have to wait for a lot of wood to break down while your plants are growing – you want all that rich nutrient goodness to be readily available to your plant roots 🙂

I think most growers agree a good cannabis soil should look dark and rich, with a loose texture that drains well and can hold water without getting muddy (you want wet soil, not dirt-batter!). But beyond that, what do you look for?


If you get the soil part right, you have almost everything you need to get to harvest! With the correct texture, drainage and water retention, you’ve got a perfect base. Add good soil cannabis nutrients, especially in the budding phase, and you should get to harvest with great results!

In order for a cannabis plant to grow and thrive, it needs a good mix of both water and oxygen at the roots at all times! Too much water and the plant roots can’t get enough oxygen (lack of oxygen at the roots is why plants get droopy from overwatering) but on the flip side if there’s not enough water retention the roots can be injured from drying out too quickly!

Good Cannabis Soil The plant is growing in organic, composted “super soil” which has enough amendments to last your entire grow, so the only thing you do is add water!

Fox Farm Ocean Forest Soil.

Bad Cannabis Soil Cannabis soil should not have a whole lot of big visible wood chips in it. That means the soil hasn’t been fully composted, and all the nutrients and goodness in that wood is mostly unavailable to your plants.


Although that list looks vague and complicated at the same time, the requirements you want to meet are actually pretty simple; let me break it down!

Generally, anything labeled as an “organic potting mix” will work. This type of mix hasn’t been amended with chemical slow-release nutrients, which is one of the main things you want to avoid with soil for cannabis. I know it sounds like heresy, but even the Miracle-Gro version of “organic potting mix” will work okay, because unlike their original potting mix it doesn’t contain chemical nutrients (though it still has poor drainage and moisture retention – almost any other type of organic potting mix is better!).

Some growers choose an amended and composted “hot” soil that slowly releases nutrients over time. With this type of soil, you typically just add water or natural supplements like worm tea from seed to harvest. Other growers prefer a lighter potting mix so they have more control, and give nutrients in the water once the plant roots have used up the nutrients in the soil. But which brands can you trust?

What should you look for in good cannabis soil?

Their Ocean Forest soil mix is “hotter” soil (higher levels of nutrients) that contains ingredients that cannabis plants love, including earthworm castings, bat guano, fish meal and crab meal. The nutrients contained in the soil will provide everything your plant needs for several weeks. Although it might give young seedlings just a touch of nutrient burn at first, they can be started in Ocean Forest soil and will soon be able to use the nutrients and start growing quickly. Some growers might put a little big of Happy Frog on top of a container of Ocean Forest, just to make it a little more gentle for seedlings the first week or two.

More About Common Amendments to Alter Texture, Drainage & Water Retention of Soil.

Usually an organic potting mix does not have enough nutrients to last your plants for more than a few weeks, so it’s a good idea to always supplement with cannabis-friendly nutrients, especially in the flowering stage when your plant is making buds and needs lots of extra Phosphorus and Potassium.

Super Soil has a colony of micro-organisms living in the soil which form a symbiotic relationship with your plant roots. They deliver nutrients to your plant, and in return they eat the sugars that get secreted by your roots!

Recommended soil nutrients:

Try to get soil that looks like this!

Good Cannabis Soil Rich and light composted soil. Since this soil doesn’t have a lot of perlite, it’s a good choice for a grower who doesn’t want to add a lot of extra nutrients or supplements in the water.

Example of happy marijuana plants in good soil!

When it comes to growing cannabis in soil, unless you’re using a brand that is known for making soil that is specifically cannabis-friendly, there are a few things that you need to consider before starting a grow.

Bad Cannabis Soil Don’t use dirt from outside! It almost never works, especially if it looks like this!

The soil in which you plant your seeds makes up the upper layer of the ground. In natural conditions, this is a mixture of organic remains, clay, sand, and tiny rock particles. If this is your first time growing cannabis, then you should invest in buying high quality soil. The soil ought to be sufficient to provide your plants with nutrients all throughout the growth cycle. That way, you won’t need to add any additional nutrition or growth boosters.

Your soil should be able to retain water. If the soil doesn’t trap water, it will simply drain away too quickly and the soil will dry out. This will cause nutrient shortages in your plant.

Find out how to germinate cannabis seeds in your soil!

Which Soil Should You Choose For Your Weed Plants?

The acidity of your soil is indicated by its pH value. Soil has a pH value, just like a jar of pickles or battery acid. pH values can be high (alkaline) or low (acidic). For weed plants, pH values ranging between 6 and 6.8 are ideal. Slightly lower values will still allow the plants to grow. Most commercial potting soil has a pH value somewhere between 6 and 7, so these are well-suited for cannabis plants.

So why would you bother with finding good soil? You just want to grow cannabis, right? Isn’t that just a matter of putting seeds in the ground and off you go? If only it were that simple. Without care for the right soil, you could get a meagre harvest, or your plants could even wither and die. With just a tiny bit of information on the best soil for cannabis plants, you’ll significantly increase your chances of healthy and bountiful weed plants.

The right soil texture helps your plants grow by allowing the roots to develop freely. Roots are vital in providing water and nutrients to your plants. Good soil texture ensures enough air and nutrients for the roots. It also regulates the balance between drainage and water retention. Texture simply means the firmness or looseness of your soil. Soil that is too firm will be too hard and form lumps that prevent the roots from penetrating the soil. Soil that is too loose will not retain enough water.

Cannabis loves soil that is light and crumbly. This type of soil promotes healthy root growth, while still getting your plants all the nutrients they need. There’s an easy way to test your soil for this. Just grab a handful of moist soil and squeeze it. When you open your hand, the soil shouldn’t stick, but just fall back to the floor as loose bits of soil.

So there you have it. Now you know what the best soil for cannabis plants is. Did you already purchase your cannabis seeds? Be sure to germinate them and then plant them in your nutrient-rich soil. You’ll be watching the miracle of growing your own weed plants from up close and personal before you know it!

You have a number of options at your disposal when choosing the best soil for your cannabis plants. You can also mix several types for your perfect personal blend. Sandy soil will not retain enough water. Silty soil drains a bit too fast, while clay soil will retain too much water. The best soil is a blend of these three: loam. Loamy soil is a mixture of sand, silty soil, and clay, with some added organic compounds. Loam has the optimal balance between retaining water and drainage, while also being rich in nutrients. The only downside to loam is its relatively high price. Still, you are bound to get a return on that investment. It will pay off in the form of big, strong, and healthy plants.

Water Retention.

Look for the following factors when buying soil for cannabis plants:

Your soil should be able to drain water as well as retaining it. Drainage means water slowly dropping down to deeper layers of soil. Without drainage, the soil gets too moist, drowning the roots of your plants. Overexposure of roots to water can cause them to die off. You also increase the risk of fungi and rot. Keep in mind that cannabis plants generally like their soil to dry up somewhat before they receive new water.

Coming Soon To A Flowerpot Near You…

Your plants take root in your soil in order to draw strength from the earth. Cannabis plants need nutrition, air, and water to grow. The wrong type of soil could cut off their supply of these essentials. In addition, it could increase the risk of contracting fungi or pests.


Keeping check of pH values is wise. If pH values deviate from your intended level, they may prevent your plants from absorbing water from the soil.

The nutrients present in the soil power the growth of your plants. The potting soil you buy usually contains enough nutrients. It might be wise to add some extra nutrients once your weed plants start to flower, since your soil could be depleted at that point. You can increase nutrient levels by adding compost, humus, or worm manure, for example.

Because Top Seeds Deserve Top Soil.

Soil quite literally provides the foundation for a good weed harvest. That’s why finding the right type of soil is important for growing cannabis plants. For good growth and flowering, plants need soil that meets certain conditions. Texture is an important factor, as are drainage capacity and pH values. Finding out what soil types are the best match for your weed plants is definitely worth your while. In the end, that knowledge will reward you with strong and healthy cannabis that yields the biggest and most fragrant flower buds.

Disclaimer: Local laws and legislation on cannabis cultivation and germination of seeds vary between countries and states. Amsterdam Genetics products and information are exclusively intended for use in areas where such use is fully legal. Check your local rules; do not act in conflict with the law!