NUTRIENT REQUIREMENTS FOR SEEDLINGS, VEGGING, AND FLOWERING WEED PLANTS
Cannabis’ nutrient requirements change depending on which stage of life it’s in.
NUTRIENTS FOR CANNABIS SEEDLINGS
Cannabis seedlings get all their nutrients from their seed, and absorb water via their leaves as their root system develops (that’s why it’s important to keep them in a warm, humid environment).
You won’t need to start feeding your seedlings until they’re about 3–4 weeks old, at which point they’ll have developed 3–4 true leaves, thus entering the vegetative growth phase.
NUTRIENTS FOR VEGETATIVE CANNABIS PLANTS
Some growers opt to start their plants off on a light fertiliser (there’s that NPK ratio) for one week just when their seedlings start to enter their vegetative growth phase. This step can be a great way to introduce your plants to their fertiliser and avoid nutrient burn. However, some growers see great results immediately starting their plants on a fertiliser to kickstart growth.
By the mid-vegetative phase (roughly 6 weeks after germinating), you’ll want to aggressively increase your plants’ nutrients to help them develop strong, healthy foliage. Most growers opt for a fertiliser by this stage.
These heightened levels of nitrogen will help your vegging plants produce luscious, green foliage and develop plenty of bud sites in time for flowering.
Towards the end of the vegetative phase, it’s a good idea to start lowering your nitrogen levels and preparing your plants for the switch to their bloom booster. Most growers use a fertiliser in the last week of the vegetative phase.
NUTRIENTS FOR FLOWERING CANNABIS PLANTS
Flowering best cannabis nutrients need less nitrogen and more potassium to promote the growth of big, resinous flowers. During the first two weeks of flowering, most growers feed their flowering plants with a 5:7:10 fertiliser. From here on out, it’s common practice to keep dialling up the nutrients on all fronts, always keeping potassium concentrations higher than the rest. By mid-flowering, most growers will be using a 6:10:15 nutrient solution.