Dutchfest FAQ's
Match it to what you are growing in. Hydro Grow and Bloom A&B suit recirculating and run-to-waste hydroponic systems on inert media. Coco A&B is formulated for coco coir, which binds calcium and magnesium and releases nutrients differently. Using the hydro formulation in coco is the most common cause of calcium shortfall partway through a cycle.
They are the vegetative and flowering halves of the same base system. Grow carries higher nitrogen for leaf and stem development; Bloom shifts the balance towards phosphorus and potassium for flower production. You switch from one to the other as the plant changes stage rather than running both together.
Early — through propagation, transplant and the first weeks of vegetative growth, when the plant is building its root system. Root products give the least return when added late, because by then the root mass is largely set. It comes in 1L, which covers a considerable number of feeds at typical dose rates.
It is the flowering additive, run through the second half of the cycle alongside the Hydro Bloom or Coco base rather than replacing part of it. As with any flowering booster, follow the label rate rather than assuming more is better — additives raise total feed strength, and pushing EC too high in flower causes more problems than it solves.
The Hydro Grow and Bloom bases come in 1L, 5L and 20L, Coco A&B in 1L and 5L, and both additives in 1L. That covers a home tent through to a commercial room on the hydro side. Buy the size you will realistically use within a season, since concentrates do not improve with age.