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Make Your Own Organic Soil Mix

– with Slow-Release Nutrition

Want to save money, skip unnecessary additives, and give your plants a healthy, nutrient-rich foundation from the start?
It’s easy and sustainable to make your own organic soil mix – no synthetic fertilizers needed, just the essentials your plants crave.

This mix is ideal for medium- to high-demand crops like tomatoes, chilies, and cucumbers. Growing herbs? Check out our dedicated guide for herbs.

Basic Organic Soil Mix Recipe

This is a well-balanced base mix, designed to give your plants a strong start – comparable to a high-quality potting soil.

Component

Purpose

%

Soil (coco coir, seed starting mix, or quality potting soil)

Base structure

50–60%

Perlite, grow clay or fine LECA

Drainage and root aeration

10–20%

Compost (or heat-treated soil conditioner)

Organic nutrients and microbial life

15%

Lime (preferably dolomitic)

Balances pH, adds calcium and magnesium

5%

Rock dust (basalt or granite)

Trace minerals and soil texture

~2%

No compost? No problem
  • Free compost is often available at local recycling stations in the spring.
  • Soil conditioner (heat-treated compost) is available at most garden centers and hardware stores.
  • Try Bokashi composting – a low-odor fermentation method that creates rich soil in just a few weeks. Read more

Extra Nutrition

Want even stronger growth and better yields? Supplement your base mix with:

Add-on

Benefit

%

Worm castings

Organic nitrogen, improves soil structure

5%

Kelp meal (or home-dried seaweed)

Trace minerals, strengthens cell walls

2%

Potash  (clean wood ash)

Potassium for flowering and fruiting

0,5-1% (add more later if needed)

Worm castings, also known as vermicompost, are a nutrient-rich, gentle fertilizer that improves soil structure and supports microbial life. You can find it at most garden centers or order it online directly from producers.

Seaweed you can forage and rinse thoroughly, dry, crush and store (or buy kelp meal online).

Potash (wood ash) you can choose to apply later as a topdressing at the end of the vegetative phase. If you’re using bottom watering, let the soil dry out for 24–48 hours, then water from the top a few times to help the potash soak into the root zone. Be cautious, potash is highly concentrated and can burn plant roots ”less is more”. Ensure that it comes from clean wood. Can also be purchased online.

Natural Boosters: Banana Water and Seaweed Tea

No kelp meal or potash? Try these homemade alternatives:

  • Banana water: Soak organic banana peels in water for 1–2 weeks
  • Seaweed tea: Soak dried seaweed overnight in water


⚠️ Watch for smell – and only use these teas for soil watering, not as foliar sprays, to avoid fungal issues.

Let It Rest

For best results, mix your soil 1–2 weeks before use.
This gives time for microbial life to activate and for pH and nutrients to stabilize – especially important if you’re using fresh compost or lime.

When Is This Mix Enough?

This soil mix typically supports the full lifecycle of:

  • Dwarf and compact varieties
  • Smaller chili, tomato and cucumber plants
  • Any crop grown in large containers or raised beds


If your plants grow large or start showing signs of nutrient deficiency – especially during flowering and fruiting – you can top up with extra organic nutrition.

Ready to Mix?

Make a big batch and store it in a sealed container.

It will keep moisture and microbial life stable – and your plants will reward you with stronger roots, healthier growth, and less need for external fertilizers.

Self-watering pots

Upgrade your plant care routine with our stylish self-watering pots, perfect for herbs, flowers, and even small veggies like chilies or tomatoes. Available in three sizes, these pots combine sleek design with smart functionality to keep your plants thriving.

Equipped with a built-in wick system and a handy water level indicator, these pots ensure consistent hydration and make it easy to know when it’s time to refill. Simple, elegant, and hassle-free – perfect for busy plant lovers. Read more

Build in anywhere and grow everything from sprouts to dwarf trees

CultiKit is your Plug & Grow solution with efficient full-spectrum grow lights and low energy consumption. With CultiApp, you can easily control lights, fans, and pumps. Easy to integrate under shelves, in cabinets, bookcases etc. The only limit is your imagination.

1.137 Kr.

 850 Kr.

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Low energy consumption

20-40 KW

Incl. two Arctic fans!