Best Soil for Weed in South Africa

If you’re asking this question, then we’re guessing you’re probably new to growing – or you’re serious about getting it right. We’re passionate about helping people grow their own plants, and we do so by providing some tried-and-tested tips, tricks and guides on how to grow your own cannabis at home.

If you’re looking to find the best soil for growing marijuana, then you’ve come to the right place. By the end of this guide to the best soil for growing weed – you’ll be able to pick the right soil with confidence. You can thank us with a snapshot of your yield later!

best-soil-for growing-weed

Best soil for cannabis

Growing cannabis in soil is far cheaper, and a lot easier, especially for beginners. Whether you’re growing your weed indoors, in a small grow tent, or outdoors in the garden, whatever your choice of location, growing in soil is a great and natural way to crop fat, beautiful buds.

What’s more, is that soil is probably the most forgiving medium for growing. The biggest challenges are managing the watering of your plants, and the potential for problems caused by pests and diseases. Both of these risks are quite easily minimized through good management of your plants, as well as good hygiene.


When it comes to growing in soil, it is very important to choose (or make) a soil that will be best absorbed by your plants. The biggest mistake that growers make when using soil is to ‘stuff’ their soil with nutrients.

Overusing nutrients is not going to somehow yield a super-plant. Cannabis plants actually require different levels of nutrients during different stages of their life. And these nutrients are best absorbed at a pH level of 5.5 – 6.

How to test the pH of my soil?

For this you will need a pH tester kit. These can be bought at any nearby garden centre and they are fairly inexpensive. Or you could try this DIY method of testing your soils pH too.

Why is the right soil important?

Yes, cannabis is technically a weed, and yes, weeds can grow in a wide range of soils. But do you want your marijuana plant to truly flourish? To produce lots of THC, CBD and other cannabinoids? We thought so, therefore your future plants need the right balance of variables in their soil.

These are:

  • Good drainage (you do not want muddy, clumpy and waterlogged soil)
  • Also, good water retention
  • The correct balance of fungi to bacteria
  • A soil pH of around 6
  • The right texture (as in how does it feel? Yes. It should be loose and not compact or very hard)


Okay, now it’s time to get into the best soils available for you to buy in South Africa for growing your bud:

Best potting soil for weed

Getting a soil that has good drainage, good water retention and well balanced nutrients, all bagged up into a soil with the perfect texture – is the aim here.

Here are some choices of the best soils for marijuana. They can be mixed up to create the perfect soil for growing cannabis plants:

Freedom Farms Soil Premium Growing Medium

This organic blend is formulated in South Africa mainly for organic growing practices and organic nutrients.

Freedom Farms produces a range of craft soils, for the connoisseur-grower and the gardener that requires optimal plant growth that can’t afford to skip a beat in production. According to some local South African growers, this is the best soil for growing weed.


Coco Coir, Worm Castings, Compost, Perlite (10%), Vermiculite, Bone Meal, Gypsum, Fermented probiotic bran.


Around 6

Used for

  • Growing in small pots
  • Indoor, Greenhouse or Outdoor growing
  • Organic potting soil for vegetables, herbs and general plants
  • Growing organic marijuana plants

Where To Buy

Cape Town:

Contact: 021 671 9447
Address: 125 Belvedere Road, Claremont, 7708, Western Cape

Contact: 011 462 6093
Shop 2, Riverbend Junction, Cnr Riverbend Road & Witkoppen Road, Fourways, JHB


Contact: 031 569 5329

Address: 51 Columbine Place, Glen Anil, Durban, KZN

Stodels Red Tractor Potting Soil

If you’re planning on getting your bud on, this is a simple potting soil mix that has worked really well for many weed growers on a budget. The Stodels red tractor potting soil is great for mixing up the perfect soil to grow your plants in.


Coco coir is an ideal grow medium because it holds water exceptionally well. The physical properties of coco soil ensure an even balance of water and air in the root zone. It drains very well well too.

Best soil for growing weed indoors

When it comes to growing weed indoors, the soil you use will be fairly similar to the soil used outdoors. Sun, water and nutrients are everything. So go and get yourself some Seagrow (not for your germinating seeds or seedlings just yet) from your local spar or garden centre, and ensure your plants get enough sun and/or light!



The best ratios

So how does one go about mixing up the perfect soil for growing weed? Well, if you’re going with something like Freedom Farms premium growing medium (see the ingredients), you will notice that it has everything your plant may need, you’ll just need to top it up as your plant happily eats through the nutrients in the soil.

Here are the ratios for making the perfect soil mix:

The Germination Phase:

During this phase, nutrients, drainage, sunlight, ect. don’t have a say – they only feature once we’ve successfully helped our babies through this phase first.

Here are two methods you could try for this phase:

A: Gently plop your seeds between two wet paper tissues (or cotton buds) and place them in a plastic container. This is done indoors, and try to place the container in a spot where there will be higher humidity levels inside the container (put the lid on top of the container, BUT DON’T CLOSE IT). Temperatures in the container should be around 23 °C, and moist, but not overly wet. End goal? You’re waiting to see the first few millimeters of the root breaking through. This can take a few days, so be patient.

B: Fling your seeds into a glass of drinking water and wait a day or two until seeds have cracked. Keep waiting until you see the first few millimeters of the root. Place your cup somewhere light doesn’t reach it, but it will still be warm.

The Seedling Stage:

Your marijuana plants will never be as vulnerable as they are in their seedling stage, and this is often when people think they should jam-pack its diet with nutrients. Nope, don’t do that. ‘Nutrient stuffing’ is a mistake that can easily end your plant’s life before its even properly started, and some well meaning nutrient supplements could easily poison your seedlings.

Plant seedlings in very small individual containers, such as a peat pot, or even one of these Jiffy pallets. However you can’t keep them in this forever, as their roots will outgrow the small space. Both of these mediums mean that they can be direct planted into the soil/bigger pot when the seedling is established and ready to move on.

If you provide your seedlings with nutrients when they are too young, they might have a sort of nutrient overdose. So as long as your initial potting soil is of a high quality, you shouldn’t need to worry about adding any more until after a minimum of a few weeks.

The Vegetation Phase:

The vegetation phase comes after the germination and seedling phases, the stem grows thicker and taller and will begin to develop new nodes. These nodes will produce more leaves and even some new branches.

For this important stage of your plants life, high quality organic soil that is “minimalist” when it comes to pre-added nutrition works best.

Bottom half of the pot: equal parts coco, perlite and worm castings

Top half of the pot: 70% worm castings, 25% coco and 5% perlite (used for aeration and water retention).

Molasses and Other Flowering Nutrients:

Your plant will naturally eat through what you are growing it in, so as the plant grows – soil levels will drop. Therefore, in this stage, you should be topping your soil up with pure worm castings and feeding it with water and Bio-Bloom or Molasses.

Bio-Bloom should be mixed at around 4 ml per litre.  When watering your plant alternate between using normal water and the Bio-Bloom mixture.

In addition, blackstrap molasses is a great nutrient to offer your plant during mid-to late-flower. One of blackstrap molasses uses it’s known best for is as an agent to deliver important nutrients to plants, such as carbohydrates, amino acids, and minerals. The benefits of blackstrap molasses will also help you bulk up the size of your buds.

Simply add between ¾ and 1 tablespoon of molasses per plant (depending on plant size, most will be fine with ¾ of a spoon) into your watering regime once a week, and stand back to watch the results.

You can buy blackstrap molasses here, and it’s one of the most beneficial organic nutrients for your plant, that also happens to be one of the cheapest. Your plants won’t be disappointed with a little added sugar.

In Conclusion

This guide on the best soil for weed should give you an idea of what to look for when purchasing your soil. And remember that when growing marijuana; sun, water and nutrients are your best friends, so you may as well start getting to know each other!





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