PK 13/14 Flower & Fruit Booster by CANNA | UK Stockist

£5.95

Size 250ml 1 Litre 5 Litres 10 Litres Syringe Only

PK 13/14 – One Week, One Bottle, Noticeably Bigger Fruit

Most plant feeds ask for a long-term commitment: every watering, every week, all season. PK 13/14 asks for one week. That's it. Used at the right moment, when a plant's demand for phosphorus and potassium suddenly surges as fruit and flowers swell, a single week of PK 13/14 delivers exactly what the plant needs, exactly when it needs it. It's the horticultural equivalent of a well-timed espresso rather than a pot of coffee drunk all day.

Made by CANNA, one of Europe's most respected plant nutrition specialists, PK 13/14 combines pure phosphorus and potassium in very high concentrations through a special production process, so both elements are available to the plant quickly and directly.

Why Phosphorus and Potassium?

Phosphorus drives energy transfer inside the plant and strengthens cell formation in flowers and developing fruit. Potassium moves water and sugars around the plant, builds firmness and quality, and ensures there's enough sugar available for fruit to swell and sweeten. During flowering and fruiting, a plant's appetite for both rises sharply, often faster than a standard feed can keep up.

Perfect For

Greenhouse and patio tomatoes, chillies and peppers, aubergines, strawberries and soft fruit, courgettes and cucumbers, citrus and fig trees in pots, and flowering houseplants coming into bloom. Suitable for soil, coco and hydroponic growing, indoors or out.

Key Benefits

Bigger, better-developed flowers and fruit
Pure, highly concentrated phosphorus and potassium
Fast, direct availability to the plant
Needed for just one week per crop cycle
Works with any growing medium and any base feed

How to Use

Add 1.5ml per litre of water for one week during flowering or fruiting, following the timing on the label for your crop. Pairs well with Boost Accelerator, which helps the plant make full use of the extra nutrition.

🌿 Rose's Pro-Tip: with tomatoes and chillies, the sweet spot is when the first fruits are set and starting to swell. Earlier, and the plant isn't ready to use it; later, and the fruit has already decided how big it's going to be.