In order for your plants to grow and thrive they need a good mix of both water and oxygen at the roots at all times: too much water and the roots can't get enough oxygen but if there's not enough water they can be injured from drying out too quickly. What gets the best results for growing your plant is a soil with a light texture that is good at retaining water - but not too much!
What also really helps with getting oxygen to the roots of your plants is using a breathable pot (see here for our page explaining the benefits of these compared to standard plastic pots).
On this page, we break down our recommendations into:
- Photoperiod: flowering happens naturally when the amount of light per day reduces, or
- Autoflowering: flowering after a certain time period regardless of the hours of light per day.
In either case, the most important aspect of any soil is its texture, ability to drain, and overall water "holding" ability. It’s important to note that there should be absolutely no "time release" chemical nutrients in the soil – these types of soil slowly release nutrients over the course of months, which provides too much nitrogen in the flowering stage and could impair overall bud growth.
Buying from a garden centre
Depending on where you live, you’ll have a different experience finding a quality soil mix that fits your needs. Generally speaking, our advice is to visit your local nursery or grow store and talk to the experts - if you’re shy about mentioning your particular plant type, ask for a rich soil suitable for tomatoes which thrive in similar soil.
Unlike anything that you would find in a garden centre, the 100% organic Biobizz All-Mix is a specialist soil-based growing medium with a long-standing reputation for producing excellent results.
GroWell have their own soil mix that has been recommended to us. It’s 40% coco, 60% peat and contains both calcium & magnesium at just the right ratio (2:1). It will hold a lot of water, since it’s 60% fine grade Irish peat. For strong rooting, the mix is 40% high grade coco - this gives it a light & airy structure. To prevent deficiencies & enhance nutrient uptake, Tropic Mix contains an actual magnesium limestone, a rich source of calcium & magnesium.
Growers everywhere choose Soil Supreme because it's easy to use and the quality has stayed consistently high over many years. It features a blend of sphagnum peat and fytocell foam that's enriched with organic growth stimulants. It has a lovely, fluffy consistency and is only lightly fertilised, so there's no risk of causing burning when potting up younger plants.
These strains prefer a light to non-fertilised soil mix. A 50–50 mix of coco coir and light peat-based soil with plenty of perlite for drainage is recommended for autoflowering and young photoperiod plants. It’s always best to go easy on the fertiliser during the seedling stage for any kind of cannabis.
BioBizz Light Mix is an ideal potting soil for organic gardeners who want to have control over the growing process through the application of liquid fertilisers. With a low dose of fertiliser, it ensures a fast development of roots and vigorous new growth. The soil composition is ideal for optimum drainage throughout the medium, which is essential for usage with automatic watering systems.
This is made using the same Swedish virgin white peat and high quality perlite for maximum aeration and water retention but with less added nutrients. The lower concentration of nutrition enables quick root formation and the ability to refine your nutrient regime from the very start of a plants life cycle. This mix is also mixed with Swedish clay, lime, minerals, trace elements and organic fertiliser to make a light soil mix thats ready straight out of the bag.
Many potting soils come pre-fertilised to levels that are often too high for younger plants, causing over-feeding issues and stunting growth. Seed Mix is much gentler and won't burn young plants! You can then have complete control over fertilisation levels, administering nutrients as and when you need them.
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