The Grotek range as it is actually used in a schedule rather than as it appears in a catalogue: Monster Bloom and the flowering boosters, the Gro-Silic silicon supplement, Vitamax Pro, and where each of them belongs between transplant and harvest.
Grotek is a Canadian line distributed in Southeast Asia through AZ Growshop, which is why product questions, availability and feeding schedules collect in one place here. The threads below cover the individual products; anything not tied to this brand belongs in General Nutrients Q&A instead.
Two points recur often enough to state once. The flowering boosters are concentrated phosphorus and potassium with no nitrogen, which makes them easy to overdo: they are a supplement bolted onto a complete base during a defined window, and running them long or heavy shows up as burnt leaf margins rather than as extra weight. And the silicate supplement is a strong base: Grotek’s own instructions say it must never go into nutrient concentrate, so it is pre-diluted, added to the tank before the nutrients, and the pH is checked afterwards rather than before.
Where to start