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How To Activate Biochar

What does “activating” biochar mean?

Biochar is like a rechargeable battery or a sponge in the soil.

  • Fresh (raw) biochar is very absorbent.
  • If you add it straight to soil, it will soak up nutrients first, then slowly release them later.
  • This can temporarily rob your plants of nutrients for the first few months.

Activating (also called charging or inoculating) biochar means pre‑loading it with nutrients and beneficial microbes so it starts helping your plants immediately rather than taking from them.

How to activate biochar with Earthly’s inoculant

When you buy Earthly Organic Biochar, it comes with a small pouch of inoculant powder.

This blend contains:

  • Beneficial bacteria and fungi
  • Seaweed extract
  • Humic acid

To activate your biochar:

  1.  Add the inoculant powder to water following the packet instructions.
  2.  Stir well until the powder is fully mixed.
  3.  Soak your biochar in this liquid for a few minutes so it can absorb the solution.
  4.  Apply the activated biochar to your soil or potting mix.

For best results, add activated biochar at about 10–20% by volume in beds, borders, raised beds, or containers.

How to activate biochar with compost tea

Another excellent way to charge biochar is with compost tea. This is how we activated our biochar when we tested it on 4,000 plants at a local nursery.

Basic method:

  1.  Take finished, mature compost.
  2.  Mix the compost with water to create a liquid compost tea.
  3.  Optionally add a small amount of sugar (like molasses) and bubble air through the mix for 12–24 hours to boost microbial life.
  4.  Add your biochar to the compost tea and let it soak so the liquid and microbes can move into the pores.
  5.  Drain and apply to soil or mix into potting media.

This method loads biochar with a rich community of beneficial microbes as well as nutrients.

Other ways to activate biochar

You can also charge biochar using other organic liquid feeds:

  • Liquid seaweed
  • Well‑diluted organic liquid fertilisers
  • Home‑made plant feeds

You can use liquid fertiliser and water alone, but you’ll get better results if microbes are present, because it’s the microbes that transform nutrients into plant‑available forms.

Charging biochar with compost

A simple, low‑effort activation method is to mix biochar directly into finished compost.

  • Blend biochar into compost at around 10% by volume.
  • Leave the mix for about two weeks or more.

During this time, nutrients and microbes will gradually move into the pores of the biochar, “filling” it so it’s ready to benefit your soil as soon as you apply it.

Key reminder

  • Do not add large amounts of completely raw biochar straight to soil unless you plan to leave the soil for 6-8 weeks before planting
  • Do charge it first with nutrients and microbes so it supports plant growth from day one.

If you tell me your main use case (pots, veg beds, perennial borders, field scale), I can suggest a specific activation method and mixing ratio tailored to that.