Plagron PK 13-14 | Flowering Booster – Black Flag Horticulture

£5.99

Size 250ml 500ml 1 Litre 5 Litres 10 Litres 20 Litres

Type: Mineral
Mineral feeds are dissolved minerals your plant can use straight away. They're fast-acting and precise, but it is possible to overdo them, so stick to the dose.

Heavier Harvests in a Clear Bottle

Some products need a long explanation. PK 13-14 doesn't. It's one of the most widely used bloom boosters in the world for one simple reason: in the heaviest weeks of flowering, plants are hungry for phosphorus and potassium, and this gives them a concentrated dose of exactly that.

Plagron PK 13-14 is a mineral booster that delivers extra phosphorus and potassium during flowering, for more compact, solid and heavier fruit and flowers. It works alongside any base feed, in soil, coco or hydro. And yes, it's meant to be transparent.

Why It Works

Extra P and K: exactly what plants crave in mid-to-late flowering.
Denser, heavier results: more compact and solid fruit and flowers.
Works with any base feed: soil, coco and hydro.
Tiny dose: 0.5–2ml per litre.

For Houseplant & Garden Growers

Tomatoes, chillies and peppers put on noticeably heavier fruit with a little PK through the main fruiting weeks. Add a splash to your normal bloom feed once fruit is setting.

For Growers

Dose: 0.5–2ml per litre (max 1:500). Add PK 13-14 first, then add your base nutrient until you reach the desired EC.
When: at every watering from week 4 of flowering until one week before harvest.
Use with: Terra Bloom, Plagron Coco A&B, Hydro A&B or any other base feed.

Rose's Pro-Tip: Plagron print their feed charts per 10 litres, not per litre like most brands. Read one the way you'd read a CANNA chart and you'll be out by a factor of ten.