Fertile soil is one of the most important aspects for a successful breeding. Whether you grow indoors or outdoors, autoflowers or photoperiod strains, a home grown weed plant needs nutrients from the soil for its growth and flowering. However, many growers often wonder which soil is cannabis friendly and which soil should be avoided. Here the starting point is clear and simple; cannabis friendly soil has a loose structure, sufficient drainage and is able to retain sufficient water at the same time. So what is the best soil for growing weed? You read it in this blog.
Best soil for weed
Of course you can already think about adding nutrients to your soil, but let’s start off with the basics.
The best soil for weed is a soil that provides a good balance between oxygen and water at the roots. Too much water causes stifling roots (the plant gets too little oxygen), but if it drains the water too quickly, the roots can dry out. So you need soil with a loose texture that is capable of retaining water and draining the excess water at the same time.
Related article: Cannabis growing tips
How to recognize the best soil for growing weed?
- The soil has a fairly dark color. Light-colored, sandy soil usually does not have (sufficient) nutrients that can reach the roots of the plant.
- Look at it and feel it. Cannabis grows best in the soil with a light, airy texture and good drainage, which appears almost fluffy when dry. As a test you can apply the following: turn the soil into a ball. The soil of which the ball is made must stick loosely together, but also fall apart easily if you squeeze it.
- The earth contains small white downy rocks (perlite). This is usually a good sign because it means that this soil mixture is meant to have good drainage. The structure is loose and drains well (after adding the water, the puddle of water on the earth quickly disappeared)
- Contains no chemical nutrients. Do you read the word “chemical” somewhere? Do not buy the product. After all, chemical fertilizers will release slow chemicals. Exactly what you don’t want for your plant.
- Check for wood or bark in the soil. Often that is not a good sign. Unless it explicitly states that it is an organically composted soil.
What is the best soil mix for growing weed when it comes to photoperiod strains?
We have explained in a simple way what the characteristics of good soil are for growing a weed plant, but of course you would like an answer to the question: what is the best soil for growing weed when it comes to commercial soil? We show the best options below:
As a beginner, we recommend to keep your grow as simple as possible and choose composted Super Soil. Although this soil isn’t cheap, it contains all the necessary nutrients, a loose structure, drains well and retains sufficient water. So all you have to do is add water. With Super Soil you don’t have to add extra nutrients.
What is Super Soil and why is it suitable for growing cannabis?
Super Soil is a type of soil with slowly released organic food sources parallel to the life cycle of the plant. Moreover, the soil has a perfect PH value. The microorganisms that live in the soil provide nutrients to your plant, and in return they eat the sugars that are secreted by your roots. So Super Soil is actually a living soil full of microorganisms and it mimics very well what happens in nature.
When you decide to use Super Soil, it is advisable not to give too much water at a time. Watering too fast and too much can drain off the nutrients and that is a shame, because your plant needs them. So give enough water to saturate the soil without draining much water from the soil.
Fox farm soil is very suitable for growing weed plants and is particularly popular in the US. The two most suitable types are the Fox Farm Happy frog and the Ocean Forest.
Fox Farm Happy frog
Fox Farm Happy Frog is a very suitable soil for seedlings and clones, but also contains sufficient nutrients for the entire life cycle. When you choose Happy Frog you do not have to transplant your plant if you don’t want to.
Fox Farm Ocean forest
In addition to the Happy Frog, the Ocean Forest is a very suitable soil type for growing your cannabis plant. Especially since the soil contains enough nutrients for the entire process from seed to harvest. However, Ocean Forest is “hotter” than Happy Frog. This means that the soil contains higher levels of nutrients. This may be undesirable for seedlings. A seedling needs very few nutrients and is also capable of burning very few nutrients. Although the chance is very small your seedling can die from overfeeding, but you can easily exclude this risk by starting with Happy Frog soil and transplanting to Ocean Forest soil after 2 weeks.
If you cannot get Super Soil, we recommend you choose organic pot mix.
What is organic pot mix?
Organic pot mix is a soil mix without the addition of slowly degradable chemical release nutrients.
Points of attention
- In many stores, almost all pot mix is presented as “organic”. It is therefore important to check whether your potting soil is really organic. Slowly degradable chemical release nutrients must be avoided at all times.
- Organic potting soil usually doesn’t have enough nutrients to feed your plants for longer than a few weeks. It is therefore wise to add extra cannabis-friendly nutrients, especially during the flowering phase, which will increase the phosphorus and potassium levels.
What’s the best soil for autoflowers?
Autoflowers are known for their strong character and ease of breeding. Especially due to their low-maintenance nature and light-independent genes. The enormous resistance, rapid growth and ability to flower without changing light makes the autoflower a sought-after choice among both novice and advanced growers.
The autoflower contains genes from the ruderalis and is generally a small and compact plant. This is a species that has evaluated itself in the high northern hemisphere and adapted to extreme weather conditions, which has resulted in a short vegetative phase. As a result, the autoflowering is not as fussy about the soil. Moreover, autoflowers don’t need many nutrients to flower successfully. In fact, too many nutrients can have a negative impact. However, this doesn’t mean that an autoflower cannot benefit from fertile soil. In fact, optimized soil and nutrients can significantly improve their harvest and quality.
Related article: how to grow autoflowers?
So what is the best soil mix for autoflowers?
For an autoflower it is important that the soil is light and airy. Because the nutritional requirement, in contrast to photoperiod types, is lower, many premixed soil species aren’t suitable. In many cases premixed soil contains too many nutrients. For an autoflower it is therefore better to make your own soil mixture. You also prevent your earth from being overfed. Curious how you can make your own soil mix for your autoflower? Check the recipe below:
- 1 part pre-moistened vermiculite
- 2 parts pre-moistened perlite
- 3 parts of peat moss
- 3 parts of compost
What else do you have to take into account?
- An autoflower seedling needs no nutrients in its first two weeks. It’s therefore important not to add any. This way you prevent damage to your seedling. After 2 weeks you can gently enrich your soil with nutrients, but keep the dosage low. Even in the flowering period, the autoflower needs few nutrients.
- Like photoperiod types, autoflowering species prefer a slightly acidic medium. That means a PH value of 6.2 to 6.5.
- Add mycorrhiza fungi for an extension of the root system. Your plant will then be better able to reach more distant nutrients. In addition, mycorrhiza fungi helps to catch and kill vermin such as parasitic nematodes.