OG Rapid Flower Hardener – PK Bloom Density Booster
OG Rapid Flower Hardener – PK Bloom Density Booster
£168.95 per litre · 1L (CLEARANCE)
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Pairs well with
Description
Add weight and density to finishing flowers, fast
OG Rapid Flower Hardener is a concentrated bloom additive designed to activate flower production and pack on weight during bloom, aimed at growers whose flowers stay light and airy instead of swelling and hardening up. It runs as a short, intensive PK programme rather than an every-feed additive.
Key Benefits
- Rapid response, with visible changes typically within days of starting the programme.
- Increases flower density, helping flowers fill out and gain weight rather than staying loose.
- Works across hydro, soil and coco, recirculating, run-to-waste or hand-fed.
- Short 7-day burst instead of continuous dosing.
- Repeatable late in bloom to finish flowers with extra density.
Fixing light, airy flowers that never fill out
Loose flowers usually mean the plant is short of the phosphorus and potassium needed to build density once bulking starts, and a standard base feed does not always cover that demand. A short, concentrated PK boost during the response window gives the plant what it needs to swell flowers rather than just stack loosely.
How to Use
- Hydro and recirculating: 1-2ml per litre for 7 consecutive days, then flush with plain water before returning to normal feed.
- Soil and coco: 1-2ml per litre alongside your regular feed on feed days for 7 days, then flush.
- Start low: begin at the bottom of the range given how concentrated it is, increasing only if needed.
- Second run: a further 7-day course in weeks 6-7 of flower helps finish with extra density.
- Shake well before every use.
Technical Specifications
- Type: concentrated PK bloom hardener/additive
- Dose rate: 1-2ml per litre
- Programme: 7 consecutive days, then flush
- Repeat: optional second 7-day run in weeks 6-7 of flower
- Suitable media: hydro, soil and coco
- Systems: recirculating and run-to-waste
Questions & answers
What's the dose of Flower Hardener?
1–2ml per litre. Start at the bottom of the range because it's a concentrate, and shake well before every use.
Is it an every-feed additive?
No. It runs as a short 7-day course in bloom rather than continuous dosing, with an optional second 7-day course in weeks 6 to 7 of flower. Follow the feed chart on this page for the full programme.
Can I use it in soil and coco?
Yes. It works in hydro, soil and coco, in recirculating, run-to-waste or hand-fed setups. In soil and coco, add it alongside your regular feed on feed days.
Should I check pH after adding it?
Yes, check pH and EC after mixing, as you would with any additive.
