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The Grotek range
Grotek — Canadian high-analysis supplements
Grotek is a Canadian range built around high-analysis, concentrated formulas — Vitamax Plus is a vitamin and amino acid supplement dosed at a fraction of the rate most vegetative boosters need, and the range's other core products, Monster Bloom and Cal-Max, follow the same concentrated approach for late flower and calcium-magnesium correction respectively, both formulated for growers running larger numbers of plants per reservoir.
Because Grotek's formulas run more concentrated than most brands here, it's worth measuring doses carefully rather than eyeballing them against a more dilute product you're used to — overdosing is the most common mistake growers make switching to a high-analysis range for the first time. Once dialled in, though, a bottle lasts noticeably longer than an equivalent-priced product from a more dilute brand.
Grotek suits growers who've got their feeding schedule dialled in and want to reduce storage space and shipping cost by switching to more concentrated products, rather than as a beginner's first purchase where a more dilute, harder-to-overdose product is usually the safer start.
See vegetative boosters to compare Vitamax Plus against other supplements, and enzymes & other for cal-mag alternatives. Free UK delivery over £60.