Nutrients for indoor growing: NPK and stages guide

On every nutrient label you'll find three numbers: N-P-K, i.e. Nitrogen, Phosphorus and Potassium. Nitrogen (N) drives the vegetative growth of leaves and stems; phosphorus (P) is key for roots and flowering; potassium (K) regulates many processes and supports bloom.

There's no single "best" ratio: it changes with the plant's stage.

In vegetative growth you need more nitrogen and a "grow" nutrient with higher N. In bloom the plant needs more phosphorus and potassium: you switch to a "bloom" nutrient and often add flowering stimulators.

Alongside these, use root stimulators in the first weeks and specific additives (e.g. for the substrate's microlife).

Organic nutrients (e.g. the Biobizz line) work with the life of the substrate, are more forgiving and ideal in soil. Mineral ones (e.g. Canna, Hesi) are more direct and precise, perfect in hydroponics and coco where readily available nutrients are needed.

Choose the line based on your growing method and — importantly — stick to the same line: the products are designed to work together.

Most problems come from giving too much, not too little. Start with reduced doses compared to the maker's chart, watch the plant and increase gradually. Keep an eye on the water's EC/pH if you grow in hydro.

When in doubt, less is better: a slightly under-fed plant recovers; one burnt by salts struggles far more.

Rely on complete professional lines: Biobizz, Canna, Hesi and others. You'll find nutrients, stimulators, substrates and additives in the growing and nutrients section. If you don't know where to start, write to us: we'll build a feeding plan suited to your setup, without pushing you to the priciest product.