In stock now. Phosphorus and potassium at 14:15, for the hungriest weeks.IONIC PK replenishes the phosphorus and potassium that hard-working crops strip fastest, lifting the K to N ratio exactly when flowering demands it. Fortified with iron for the energy demands of bloom, and highly concentrated at 14:15.Use alongside any base feed through peak flowering.Key features P and K at 14:15, highly concentrated Replenishes what heavy-feeding crops strip fastest Fortified with iron for bloom Use alongside any base feed .hb-qff .hb-qff-row { display: grid; grid-template-columns: 140px 1fr; gap: 14px; align-items: baseline; margin: 0 0 10px; } .hb-qff .hb-qff-row:last-child { margin-bottom: 0; } .hb-qff dt, .hb-qff dd { margin: 0; } @media (max-width: 480px) { .hb-qff .hb-qff-row { grid-template-columns: 1fr; gap: 3px; } } .hb-range-list { margin: 16px 0; border-top: 1px solid #ded6bf; } .hb-range-item { padding: 12px 4px; border-bottom: 1px solid #ded6bf; } .hb-range-item.hb-self { background: #f6f3ea; padding-left: 10px; padding-right: 10px; } .hb-range-name { font-size: 14.5px; font-weight: 700; color: #2f5f46; margin: 0 0 3px; } .hb-range-item.hb-self .hb-range-name { color: #262319; } .hb-range-does { font-size: 13.5px; line-height: 1.45; color: #262319; margin: 0 0 2px; } .hb-range-when { font-size: 12.5px; line-height: 1.4; color: #756f5c; margin: 0; } Quick Feed Facts THE HYDRO BROS Dilution / Dose 1ml/L, added on top of your base Bloom feed. When To Use Weeks 8–12, the heaviest-demand flowering weeks Substrate Fit Works alongside every IONIC Bloom formula — Soil Bloom, Hydro Bloom, Hard Water Bloom and Coco Bloom. Grower Notes Bring PK in from week 8 (once Tonic and Flower Boost are already established) and run it through week 12, alongside your base Bloom feed and Flower Boost. Good practice Add products to the water one at a time, stirring between each. Never mix concentrates neat. Keep any stored solution covered — light in stored solution eventually means algae. Measure every dose — eyeballing is where most feed problems start. The Ionic Range IONIC is one system, twelve products — a dedicated Grow and Bloom feed for each growing medium, plus four boosters used across all of them. Here's the full range: Soil Grow Vegetative base feed for soil Weeks 1–5 of the grow cycle (soil) Soil Bloom Flowering base feed for soil Weeks 6–12; water-only flush in week 13 (soil) Hydro Grow Vegetative base feed for hydro on soft/RO water Weeks 1–5 of the grow cycle (soft/RO water) Hydro Bloom Flowering base feed for hydro on soft/RO water Weeks 6–12; water-only flush in week 13 (soft/RO water) Hard Water Grow Vegetative base feed for hydro on hard/tap water Weeks 1–5 of the grow cycle (hard/tap water) Hard Water Bloom Flowering base feed for hydro on hard/tap water Weeks 6–12; water-only flush in week 13 (hard/tap water) Coco Grow Vegetative base feed for coco coir Weeks 1–5 of the grow cycle (coco coir) Coco Bloom Flowering base feed for coco coir Weeks 6–13; light feed continues right through to harvest (coco coir) Tonic Calcium & magnesium top-up that corrects deficiency Weeks 6–10 in soil/hydro; weeks 3–10 in coco; hard water only if a deficiency shows PK Phosphorus & potassium flowering booster Weeks 8–12, the heaviest-demand flowering weeks Root Boost 100% organic root stimulant Propagation through early vegetative growth (weeks 1–4; weeks 1–2 in coco) Flower Boost Bloom stimulant for yield and flavour Weeks 5–9, every week from first flower to mid-bloom FAQsWhen do I start PK?From week 8 of flowering, once your base Bloom feed and Tonic are already established — see any Bloom product page for the full feeding notes.Can I use PK with any medium?Yes — the same PK schedule (weeks 8–12) applies whether you're running Soil Bloom, Hydro Bloom, Hard Water Bloom or Coco Bloom.Is PK a replacement for my base Bloom feed?No — it's a booster used on top of your base feed, not instead of it.
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