PK Bulk is a highly concentrated, 3-in-1 phosphorus and potassium biostimulant formulated to support and extend the bloom phase in fruiting and ornamental plants. One of the most concentrated PK additives available, it remains a true solution with no suspended insolubles — ensuring consistent, reliable performance across all growing systems.Free from plant growth regulators (PGRs), PK Bulk uses natural plant extract biostimulants to increase bloom sites, support substantial fruit set and development, and extend the productive bloom phase.Key Benefits Highly concentrated 3-in-1 PK formula — more concentrated than most competitor products True solution with no suspended insolubles for consistent dosing Supports increased bloom sites and an extended bloom phase Promotes substantial fruit set and development and increased end-weight Natural plant extract biostimulants — no PGRs Compatible with any base nutrient and all growing systems Analysis Phosphate (P₂O₅): 180g/l Potassium (K₂O): 200g/l How to Use Weeks 2 to 6 of bloom: 2.5ml per 10 litres of nutrient solution Week 7 through to flush: 5ml per 10 litres of nutrient solution Can be used with any base nutrient line Available sizes: 250ml | 1L | 5L