Updated at: 15-01-2023 - By: Sienna Lewis

For growing marijuana in a greenhouse, you’ll find out which soil is optimal. Isn’t it a lot of detail? Have you ever considered growing marijuana in your garden if you own a greenhouse and are interested in these crops?

What Is Marijuana?

There are numerous different names for marijuana. Weed, pot, dope, and cannabis are some of the names given to the dried flowers and leaves of the Cannabis sativa plant. THC, or tetrahydrocannabinol, is a psychoactive chemical having mind-altering characteristics, while cannabidiol, or cannabidiol, is a non-psychoactive substance.

Marijuana can be consumed in a variety of ways, with varying results. You can wrap it up and put it in your cigarette or even use a pipe to smoke it. Some people mix it with food and drink, while others use it as a tea infusion. Marijuana can also be found in the form of concentrates, smoking oils, extracts, and more.

Growing marijuana in greenhouses may be one of the most cost-effective ways to obtain marijuana. Marijuana’s effects on a person may be affected by a variety of circumstances, including prior drug use, the method of preparation, and the potency of the medicine.

What Is The Best Soil To Use For Growing Marijuana In A Greenhouse? - Krostrade

What Is The Best Soil For Growing Marijuana?

As with any other crop, the best soil for growing marijuana in a greenhouse is a critical factor to keep in mind when growing marijuana.

There are occasions when you’ll have to grow your own marijuana rather than buy it from a store, so you’ll need to know how to do it. Wow, isn’t that amazing? Soil selection is critical when growing this in a greenhouse since you want your plants to perform at their peak.

It is important to remember that the soil that will house the roots of your plants must meet the plant’s needs. There are a variety of factors to consider, as well as soil types to choose from, while trying to achieve this goal. But these are the most critical characteristics to keep in mind: pH level, water retention, texture, nutrient composition, and drainage.

Loam soil

As the name suggests, loam soil forms a loose ball that can contain an object for a short period of time before coming apart. Near-neutral pH, water retention, drainage, nutrient retention, and the ability to support microorganisms are all characteristics of this type of soil. But keep in mind that loam soil is more expensive than the other options.

Sandy soil

As a result of its large granular size, sandy soil has a low pH and high oxygen levels, as well as great drainage, compaction prevention, and excellent drainage. You must, however, exercise caution when working with sandy soils, since they tend to dry out rapidly, retain little water, and lose nutrients readily.

Clay soil

When it comes to clay soil, you’ll find it has high pH levels and small granular sizes, which will help retain water and provide minerals to your plant life, as well as stabilize them. Despite this, they have poor drainage, thick soil, and can be difficult to work with; they should be avoided.

Silt soil

The silt soil is last but not least. In addition to supporting the plant and holding water, it has a medium granular size. Despite this, the earth is readily compacted and has poor drainage.

This brings us to the subject of marijuana cultivation.

Tips On How To Grow Marijuana

There are a variety of soils that can be used to grow marijuana in a greenhouse, so knowing which one to use is essential. However, once you know what kind of soil to use, it’s time to understand how to produce marijuana.

To grow marijuana in your greenhouse, there are two ways to go about it. One method is to plant them in individual pots, or the gardener may opt to plant them directly in the ground. In the end, it’s up to you to decide which one is best for you.

If you cultivate your marijuana in a pot, you’ll have the flexibility to move your plants around as you see fit. If you frequently visit the garden, this will come in handy.

Planting marijuana directly in the ground on the other hand is ideal for leaving them there for an extended time period. It is important, however, to ensure that they are planted to the greatest standards.

As a result of this, hydroponics enters the picture. Even if you’re a novice gardener, you may want to give this method a go if you’ve got some gardening experience under your belt.

Choosing The Best Soil For Cannabis: A Home Grower’s Guide

Using soil to cultivate cannabis yields large, flavorful buds. Soil is also one of the more forgiving surfaces available. Cannabis plants thrive in what soil? Make your own soil? Here’s all you need to know. These and other concerns are addressed by our expert.

The best soil for growing cannabis at home.

Utilization of the proper soil is critical for producing cannabis. As it turns out, finding the greatest soil isn’t always easy. When it comes to growing cannabis, there are a plethora of possibilities, from cannabis-specific soils to cheap universal substrates and pre-fertilized varieties. How about making your own soil from scratch?

Is there a particular type of soil that’s optimal for producing cannabis?


There are a variety of soils that can be used to cultivate cannabis, and not all cannabis plants require the same soil. What sort of cannabis you’re growing, your environment, whether you’re growing at home or in the wild, etc., all have a role in choosing the best soil.

Aside from these characteristics, all cannabis soils share a few characteristics in common. Let’s check them out:

• Texture

Cannabis thrives in soil that is both light and loose. It is easier for roots to form and flourish when the soil has a light texture, which allows more oxygen to reach the roots.

• Able to drain

Excellent drainage is required for cannabis soil. When watering your plants, avoid letting the water sit in puddles on top of the soil. Your plants will become ill and produce mediocre crops, or even die, if the soil is poorly drained.

• Retention of water

Water retention, or the soil’s ability to store water, is just as critical as good drainage. Water retention and drainage are in perfect harmony in healthy cannabis soil.

pH (potential hydrogen ion) measurement

Acidity and alkalinity can be measured using the pH scale. This is critical because cannabis thrives in a narrow pH range. Soil with a pH of 6.0 or above is ideal for weed growth. If your pH is between 5.8 and 6.3, you should be fine, but if it varies too much, your yields will suffer. Your plants will perish if the pH is severely wrong.

• Nutrients

Your cannabis plants require minerals to thrive in the soil. As a result, the majority of soils on the market already include them. However, keep in mind that these nutrients can last only a few weeks at a time. It is possible that commercial soils will be depleted of nutrients around the time your plants begin to flower. This is the time to begin supplementing your diet with nutrients.

Organic matter such as humus, compost, worm castings, and guano are essential if you want to develop plants without adding additional nutrients. Your plants will be able to get these nutrients whenever they need them thanks to the microorganisms in the soil.


If you’re using pre-mixed potting soil, it’s already been “tuned” to the needs of growing plants. If you’re expanding organically, things are a little different. Sand, silt, loamy, and clay are all types of natural soil. However, keep in mind that most soils include varied amounts of each of these soil types in them.

As an example, clay and loamy soil, or sandy and silty soil, can exist.


Sand is a gritty soil that drains well, although it holds little water. It is a fact of life that nutrients like nitrogen wash away quickly when a plant is irrigated. Cannabis producers might benefit from sandy soil because it is easier to cultivate.

An unwieldy framework

• Decreased acidity of the solution

• Pros: Drainage is good, soil is kept open, oxygen levels are high, and working with it is simple.


Silty soil is a medium-coarse soil type with a high concentration of minerals and organic matter. Although it has strong water retention, it also has good drainage. Working with silty soils is a cinch. It is one of the most fruitful soil types because of the minerals and organic elements it contains.

Coarse to medium-fine

Minerals and nutrients, as well as hydration retention, are some of the advantages.


Loamy soil is a mixture of sand, silt, and clay soils with organic chemicals added to it. Soil that is rich in nutrients and oxygen, as well as water retention and drainage, is ideal for growing cannabis. The downside is that this type of soil is pricey.

• Sand, silt, and clay in a slurry

Contains nutrients and has high oxygen levels, thus it retains water well.

A primer on growing greenhouse weed | Weedmaps


Fine mineral particles make up clay soils. Despite its weight, this sort of soil is difficult to work with. Adding it to an organic garden is a smart move because of the high concentration of nutrients and minerals it contains. Clay soil is excellent at retaining water, but bad at draining it.

• Particles with a small diameter

• A high pH

Cons: Doesn’t hold water, yet it’s high in nutrients


Natural soil isn’t going to be ideal for growing cannabis from the start if you’re using it. For example, the texture may not be ideal or the drainage may be inadequate. However, soil supplements, the majority of which can be bought at your local grow store, can be used to improve any type of soil.


Coconut husks are used to make coco coir (coco fiber). Fibers of this fineness are great at retaining water and are useful in loosening up heavy soils. Some people grow their cannabis on a pure coco substrate supplemented with specialized nutrients. For soil amendments, coco coir is a decent addition of anywhere up to 30 percent of your foundation soil.


It is the most common soil supplement. Because of its light weight and dazzling white color, perlite is a popular choice for improving soil drainage and airiness. Perlite, on the other hand, has a good capacity to retain water. Perlite can be used to improve your soil by adding 10–15 percent to it. Your soil may become excessively light, allowing nutrients to be leached out, if you apply too much at once Perlite is a common ingredient in commercial soils.


Clay pebble hydroponics is a common practice among cannabis farmers. You may not have known this, but soil amendments can also be utilized to improve it. Clay pebbles can help with drainage and prevent water from accumulating at the base, which is a major risk factor for root rot in raised beds and containers.

Clay pebbles can also be used as mulch on top of containers and beds. By avoiding excess evaporation, they help to keep the growing media moist. Additionally, the shade provided by clay pebble mulch helps control weeds and protect beneficial bacteria from the sun’s heat.


The heat-treated mineral vermiculite, like perlite, can be used to lighten your soil. Additionally, it is an excellent water-retentive material. Vermiculite and perlite have many similarities, however they are used for quite different purposes. Perlite and vermiculite are great for drainage and airiness, whereas perlite is great for retaining water. Fortunately, perlite and vermiculite work well together, so you can use both in your project. Vermiculite, which contains about ten percent of the mineral, has numerous advantages.


For most people, worm castings are considered a nutritional soil amendment since they are rich in beneficial microbes. In addition to improving soil texture, drainage, and water retention, worm castings can also increase the quality of your soil. Use 25–30% of worm castings while enriching your soil.


Adding nutrients to your own cannabis soil is not necessary if it is rich with organic material. Many farmers make the mistake of “fertilizing” their soil by adding manure and vegetable scraps. Because of this, the soil becomes too hot for the plants, causing their growth to be hindered. You must first compost your veggie leftovers if you want to utilize them in your garden.

In the event that you feel the need to add nutrients to your cannabis soil, you can easily buy pre-packaged remedies that are specific to each stage of growth.


Growing photoperiod or autoflowering weeds requires different soil than growing non-photoperiod weeds. In order to get the best results, autoflowers need a low-nutrient mix. A 50/50 combination of coco coir and a light, peat-based soil with some extra perlite for drainage is ideal for your autoflowering ladies.

Do not use bat guano or other high-nitrogen additions in your autoflower gardens because these will cause your plants to overheat and become nutrient-deficient. Cannabis seedlings, on the other hand, aren’t a fan of high levels of nutrients.

In the last growth pot, dig a cup-sized hole in the soil in the center of the autoflowers. Place your seed in the hole after it has been filled with nutrient-free seedling/starter soil. The hot dirt would otherwise burn your seedling if it were placed this way.

Start photoperiod plants in small seedling pots/cups with soil that lacks nutrients. It’s time to start over again. Seedlings cannot handle increased fertilizer levels as well as adult plants.


Pre-made soil from the grow shop is an option if you’re just starting out with cannabis cultivation. Good-quality cannabis soil usually contains all the nutrients your plants need to thrive in the correct proportions. If you’d like, you can add a few handfuls of perlite to your store-bought soil to promote drainage, but that’s about it.


The other option is to manufacture your own soil if the need arises. What’s the point of shelling out money for dirt when you can make your own? Make your own cannabis soil with this easy formula.


• 1 part of vermiculite

• 1 part coir peat in coconut milk

The compost is made up of two parts


1. Use a sieve to separate the compost into smaller pieces.

Warm water should be used to soak the coco coir peat. Check the product’s instructions to discover how much you’ll get.

Mix the vermiculite with the coco coir peat in a bucket.

Done! Make sure your homemade soil has a pH of 7.0 or more. 5.8–6.3 is the ideal range.

Using the above mix, you should be able to grow most plants well both indoors and out, regardless of climate. In addition, organic fertilizers can be added to your soil mix to make it even better.

Organic fertilizer made from bat guano is good for growing marijuana plants because it is cheap and easy to obtain. Spread it on top of the soil and soak it in later if you choose. Time-release nutrients like Easy Boost Organic Nutrition pellets are another option. You can feed your cannabis plants throughout their whole life cycle by adding a cup of them to your soil. Is there anything else I can do?

The Definitive Guide To The Best Soils For Cannabis

It doesn’t matter what you name it—dirt, soil, growth medium—a it’s vital part of any cannabis cultivation business. Indeed, choosing the ideal soil for cannabis is one of the most critical decisions you will make in the process of cultivating your own pot plants.

It can make the difference between a successful harvest and a total failure. Bountiful buds or a diseased plant that can’t even be composted the following year? That’s what may happen when the correct soil is used. So, yes, there’s a lot at stake here.

But what kind of soil is ideal for growing marijuana? pH: What’s the greatest one? Suppose you’re doing your growing outside? Is it possible to grow indoors? The list of possible answers is seemingly endless. But don’t worry, I’m here to help. Honest Marijuana’s knowledgeable staff is ready and willing to assist you in any way they can!

The best cannabis in the world has been grown by us for nearly a decade. As a result, we’ve been growing our food the natural way, without the use of any pesticides, chemicals, or growth regulators at all.

During that time, we’ve learnt a lot, and we’d like to share that with you. You don’t need to worry about your head blowing up from having to sort through all the information because we’ve put up a comprehensive reference to the finest soils for cannabis cultivation! First, let’s talk about the fundamentals of a healthy cannabis soil.

The Basics Of Good Cannabis Soil

Because it can grow and thrive in a wide range of environments, cannabis is frequently referred to as a weed. If you want to grow sensimilla, you don’t just need to spread some seeds in your garden and hope for the best. It’s not Jack and the Beanstalk here, bro.

Cannabis marijuana can grow in many soils, but to properly thrive—to produce large amounts of trichomes, THC, and other cannabinoids in the soil—it must have just the perfect balance of soil factors. These factors are:

  • Drainage systems that work properly
  • It’s not a contradiction to the first variable, but water retention is a good thing.
  • Composted food has a proper ratio of nitrogen to phosphorus.
  • As long as there is an even split between fungi and bacteria, it’s fine because cannabis needs soil that is somewhat acidic.
  • The pH of the soil is 6.

Let’s take a closer look at the last bullet point—pH.

Best Soil pH for Cannabis

the lowercase ‘p’ stands for potential hydrogen in case you were wondering. It’s a chemistry scale for describing a substance’s acidity or basicity (alkalinity).

Liquid drain cleaner (14 oz.) and bleach (13.5 oz.) are both fairly basic examples. Hydrochloric acid (pH 0) and battery acid (pH 0) both have a high acidity. Items that fall somewhere in the middle of the two extremes include:

  • Sodium bicarbonate of soda (9.5)
  • Ocean water (8)
  • Water that has not been tainted by anything (7)
  • a cup of joe (5)
  • Juice from a lemon (2)

Make sure to keep in mind that numbers above 7 are alkaline (basic) and those below 7 are acidic.

Soil has a pH because it includes water. Cannabis thrives in soil that is slightly acidic, as previously noted. 6.8 and 6.3 are acceptable alternatives, but the best value is 6.

While plants can thrive in soil with a pH slightly higher than 6.3 or lower than 5.8, they won’t yield as well. If you want a good harvest, try to keep your soil at a pH of 6.

Purchase a soil pH tester for this task. There’s no getting around it, I’m afraid. The pH of your saliva is not accurately measured by dipping your finger in soil and then sucking it up.

But at least they’re not outrageously priced. For less than ten dollars, you can get a decent soil pH tester from Walmart or Amazon.

As far as I’m concerned, there’s no reason to shell out for a more expensive model if you can have the same features for less money. It doesn’t matter what kind of pH tester you have.

Best Soil For Outdoor Cannabis

There are three basic varieties of natural soil: loam, sand, and clay.

  • Sandy
  • Loamy
  • Clay

However, not all soils are the same. It is possible to have a sandy/clay, loamy/clay, or sandy/clay mix. To add to the confusion, there can be varying proportions of each soil type in the landscape. In addition, the advantages and disadvantages of every type of soil vary.

Dig a three-foot-wide by three-foot-deep hole and fill it with the organic super soil we’ll show you how to make if you must grow cannabis outdoors. This will assist your cannabis plant grow tall and strong by providing the optimum drainage, water retention, and nutritional amounts.

Outside in a pot, you can also grow your cannabis plants. The organic super soil we describe below can be used to fill a three- or five-gallon pot (or bucket) before you plant your seed(s). If you wish to cultivate your cannabis outdoors, you’ll need to keep an eye on the weather conditions, including temperature, humidity, rainfall, sun exposure, and pest activity.

Growing cannabis in containers is convenient because it’s easy to move anywhere. What’s wrong with the weather? Incorporate the plant into your home’s decor. Leaves being attacked by pests? Take the plant indoors and grow it there.

The main drawback to this strategy is the additional cost of purchasing equipment to regulate the environment’s lighting, airflow, and humidity. But once you’ve got the proper equipment, you’ll be able to offer your plant exactly what it needs to thrive rather than relying on the unpredictable and brutal nature of the weather.

Best Soil For Indoor Cannabis

Organic super soil and 420 fertilizer combination is the ideal soil for indoor cannabis cultivation. In the next two sections of this tutorial, we’ll show you how to produce these two essentials.

Your cannabis plant will get exactly what it needs to thrive in the organic super soil since it has just the appropriate amount of carbon, nitrogen, phosphorus, and other nutrients. The 420 fertilizer (which you can manufacture yourself) is a fantastic addition to the mix if you want to develop tall plants with lots of buds and a high concentration of cannabinoids.

You may, of course, buy soil instead of making it yourself. In particular, this is a wonderful option for individuals who lack the room to build a compost pile outside. The best bagged soils will be discussed in the following three areas.

Best Potting Soil For Cannabis

Anything labeled “organic potting soil” or “organic potting mix” would suffice if your local garden center doesn’t have many options. If you’re in a pinch, this will do.

One of the organic soils suggested below, or the homemade super soil we discuss at the conclusion of this article, is your best choice.

When shopping for cannabis potting soil, be sure it does not contain any chemical fertilizers that release slowly over time. Using time-released pesticides in your potting soil could harm the health of your marijuana plant. That might spell doom for your marijuana harvest..

Look for one of the following brands if your local garden center has a wider selection.

Best Organic Soil For Cannabis

Cannabis-friendly organic soils have been tried and tested. 420 fertilizer and organic super soil are still preferable, but you can get by without them. Almost any marijuana-growing chatroom will have at least a few mentions of these items.

Black Gold Soil For Cannabis

When it comes to potted plants, Black Gold has been the go-to soil for many years. Peat moss, earthworm castings, perlite, compost and vermiculite are just a few of the various additions made by Black Gold that can be used to make up for the lack of essential cannabis nutrients.

Fox Farm Soil For Cannabis

Fox Farm is another bagged soil that is commonly utilized in the cannabis industry. With the Ocean Forest soil mix, your cannabis plants will have the perfect growing conditions to make the most of their potential.

Just to give you an idea, below is a list of the Ocean Forest components:

  • An emulsion of fish from the sea
  • Meal of crab
  • Meal of shrimp
  • humus from a forest that has been composted
  • Peat moss that is made up of sphagnum
  • Castings from worms
  • Shells of oysters
  • sand and clay
  • Guano excreted by bats
  • Granite sand and grit
  • Kelp from Norway

Cannabis plants, on the other hand, eat it up like it’s a piece of cake.

Best Soil For Autoflowering Cannabis

The amount of light that a plant receives during the day is what causes it to bloom. It is a type of plant known as a photoperiod. It takes between 12 and 15 hours of sunlight a day to cultivate cannabis plants outside. Late summer is usually when that happens.

How to Grow Autoflowering Cannabis Plants in a Greenhouse

However, if you grow your cannabis indoors, you can manage this factor to some extent (where the plant needs closer to 18 hours of fluorescent light).

However, autoflowering cannabis plants exist. This indicates that the plant’s flowering stage isn’t dependent on how much light it receives. It is not uncommon for autoflowering cannabis plants to begin flowering as soon as they reach a particular developmental stage.

Light, airy soil with minimal levels of nutrients is ideal for autoflowering cannabis. A lot of what we’ve talked about so far are subpar because of this. Even yet, “regular” soil can still be used. It simply means that a lighter soil will produce greater results.

Autoflowering soil can be made at home by combining the following ingredients:

  • Three quarters of a pound of compost.
  • Peat moss
  • Perlite moist and two portions
  • 1 part vermiculite that is wet

With regular, photoperiod seedlings, the following two parts are your go-to for preparing the ideal soil for cannabis plants.

How To Make Your Own Organic Super Soil

Temperature, ventilation, and the carbon-to-nitrogen ratio must all be adjustable if you want to create your own organic super soil. In order to learn more about these aspects, consult the How To Grow Marijuana: The Ultimate Organic Guide published by Honest Marijuana. Here’s a step-by-step approach on making your own soil once you’ve figured it out.

  1. In the middle of the floor, draw a three-by-three-inch square.
  2. Cover the three-by-three square with a four-inch layer of carbon material such as dried leaves or straw.
  3. Add a four-inch layer of nitrogen-rich material, such as cow manure or ground coffee, to the soil before seeding.
  4. Add a half-inch coating of blood or bone meal on top of that.
  5. To build a three-foot-tall stack, repeat the previous methods layer by layer.
  6. Decompose the waste.
  7. The pile should be rotated no more than three times per week.
  8. Composted soil is soft, crumbly, and dark black in color, with a pleasant, nutty aroma.

Those seedlings can be planted in that soil, as well as 420 fertilizer.

How To Use That Soil To Make 420 Fertilizer

Cannabis plants can benefit from this 420 fertilizer throughout the growing process. Here’s how to make it.

  • A huge tarp or a plastic kiddie pool might be used to protect the floor. The kiddy pool makes it easier for us to combine and organize the fertilizer.
  • Apply your organic super soil in a thin layer, about one inch thick.
  • Coco fiber and mycorrhizae should be added to the mix.

Add this:

Rock phosphate weighs 0.75 kilos.

b. 18 cup of Epsom salts

4 tablespoons of Azomite (trace elements)

1. A half-cup of lime juice (dolomite)

  • One more inch of super soil is needed.
  • Apply 1 kilo of bat guano on the surface.
  • One more inch of super soil is needed.
  • Spread 1 kilo of blood meal on top of this.
  • One more inch of super soil is needed.
  • On a pound of steaming bone meal, spread
  • One more inch of super soil is needed.
  • With a shovel, combine all of the ingredients.
  • Put about three-quarters of the mixture into a garbage can (or garbage cans).
  • Each container should be filled with 2.5 liters of water.
  • Allow this to steep for a month in direct sunlight.


This liquid fertilizer can be used on your potted plants after thirty days.

Some Tips We’ve Learned Along The Way

Creating the ideal soil for cannabis plants can be made a little easier with a few more pointers we’ve gleaned along the road.

  1. Before you begin, gather all of the necessary ingredients.
  2. Go at your own pace. There’s no reason to haste.
  3. Keeping a journal of your soil-related activities will aid in process improvement.
  4. Use a pH tester and learn how to read the results.
  5. Make friends with the staff at your neighborhood garden center or greenhouse (but not too many!). They are a goldmine of knowledge when it comes to all matters related to soil.

After that, all you have to do is plunge right in. You will not be able to learn any other way. Good luck with your development!

Wrapping Up

If you have these resources, answering the question “what is the best soil to use for growing marijuana in a greenhouse?” will be easier. There are numerous medical benefits to marijuana, making it more than just a contentious drug. Use this as an opportunity to cultivate marijuana in the greenhouse if you or your roommates have medical ailments that could benefit from its use.