The Grow Superstore

Grow room humidity control means holding relative humidity inside a stage-specific band: 65-80% for seedlings and clones, 50-70% in veg, 40-50% in early flower, 30-40% in late flower — with extraction, a dehumidifier and a humidifier backed by steady air movement.

Match the nutrient line to your growing medium and your tap water; brand loyalty comes second. Canna is the benchmark, Biobizz the organic soil pick, Dutch Pro the UK hard/soft-water value line, Plagron the flexible system, Gold Label the hydro specialist.