Humic acid is a soil conditioner and nutrient unlocking agent derived from leonardite — ancient, highly decomposed organic matter. It does not directly feed plants but makes the nutrients already in your soil more available to roots by improving the soil's cation exchange capacity and chelating bound minerals.
Dissolve humic acid granules or powder in water at the recommended ratio and water into the soil around the base of plants. This is the most effective application method — the humic compounds penetrate the root zone, chelate bound nutrients, and improve soil structure directly where it matters most.
Pro Tip: Apply humic acid the day after applying vermicompost or cow manure. The humic acid will chelate and mobilise the nutrients you have just added, making them available to roots faster.
Add humic acid granules to your potting mix at 2–3g per litre of medium before potting. Mix thoroughly. This pre-charges the growing medium with humic compounds that will work throughout the growing season as the plant roots expand.
Dissolve in water at 1–2g per litre and spray onto leaves in early morning or evening. Foliar application of humic acid increases the permeability of cell membranes, improving the uptake of other nutrients applied at the same time. Particularly effective when combined with a seaweed foliar spray.
Dissolve 1g of humic acid per litre of water. Soak seeds for 2–4 hours before sowing. The humic compounds improve germination rates, stimulate early root development, and improve seedling vigour. Particularly effective for vegetable and flower seeds.
When transplanting, water the new location with humic acid solution (2g per litre) immediately after planting. The humic compounds help establish root contact with soil particles and accelerate the uptake of available nutrients during the critical establishment period.