Canna PK 13/14 — The One-Week Flowering Booster

Canna PK 13/14 is a high-grade mixture of pure phosphorus and potassium — the two elements a plant's demand for spikes hard during flowering. Through a special production process Canna combines both in very high concentrations that are quickly and directly available, so when you add it at the right moment, the flowering plant's increased needs are fully met and fruits reach maximum development.

Genuine UK Stock

We only sell genuine UK-market Canna, supplied through Canna's official UK distribution — current UK-label bottles, dispatched fast from our UK warehouse.

How to use PK 13/14 — Canna's actual instructions

When: add three weeks before harvest.
Dosage: dissolve 15ml per 10 litres of water (1:666) into a full nutrient tank.
Duration: one week only. This is Canna's explicit guidance — their base feeds already carry P and K, so PK 13/14 is a one-week ratio shift, not a running additive.
Works in every medium — soil, coco, recirculating and run-to-waste — indoors and out.
Exact timing against your schedule is in our Canna feed chart guide.

The Boost pairing

Canna designed Boost Accelerator and PK 13/14 as a pair: PK supplies the extra flowering minerals, Boost drives the metabolism that turns them into weight. After the PK week, run your normal feed down and finish with Canna Flush.

Frequently asked questions

Can I run PK 13/14 for several weeks at a low dose?
You'll see that advice around — but Canna's own answer is no: always one week. Their base nutrients already contain P and K; PK 13/14 exists to shift the ratio at one precise moment, and running it longer risks overfeeding. We follow the manufacturer.

Is PK 13/14 the same as Boost?
No — PK is minerals, Boost is a metabolism stimulator. They're designed to work together, not substitute each other.

Which week exactly do I add it?
Three weeks before your planned harvest. Check the feed chart to place it against your full schedule.

Browse the full Canna range — genuine UK stock, all lines.