Canna PK 13/14 0.25l

Canna PK 13/14 250 ml is a phosphorus-potassium additive with a guaranteed 13% P2O5 and 14% K2O, suitable for every growing medium. At 15 ml per 10 litres of tap water, this bottle makes 166 litres of solution — enough for the single week per cycle in which it is used.

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Canna PK 13/14 250 ml – for the last weeks before harvest

There is a point late in flowering where the plant's demand for phosphorus and potassium climbs sharply, and a base nutrient alone no longer covers it. PK 13/14 exists for exactly that window. It is an additive, not a nutrient: it runs alongside your normal feed for one week. A 250 ml bottle makes 166 litres of solution.

How to use it

  • Add to the reservoir three to four weeks before harvest, once flowers have formed across the whole plant.
  • 15 ml per 10 litres of tap water, provided your base nutrient EC is not above 1.8 mS/cm.
  • One week maximum.
  • Check EC and pH after every addition.
  • Never use it undiluted.

Guaranteed composition

Unlike lower-grade potassium products, PK 13/14 carries a guaranteed 13% P2O5 and 14% K2O. Phosphorus drives metabolism and energy transfer and strengthens cell formation in the flowers; potassium handles water and nutrient transport and sugar production. Both are immediately available to the plant.

Keep the pH below 7.0

After adding PK 13/14, avoid letting the reservoir pH rise above 7.0. Higher values increase the risk of saturation, which forms irreversible salt compounds the plant can no longer take up. The solution becomes unusable and the tank needs cleaning. Combined with CANNA pH MIN bloom this can occasionally occur; switch to pH MIN grow, which is nitric acid based rather than phosphoric.

Who it suits

Growers who already run a complete base nutrient and want to cover the late-bloom peak without changing their whole schedule. It works with every medium — soil, coco, recirculating systems, run-to-waste — indoors and out.

Where it sits

CANNABOOST lifts the plant's metabolism and strengthens the effect of PK 13/14. The same additive comes as a 500 ml bottle and a 1 litre bottle. See the Canna category.

Frequently asked

How much solution does 250 ml make?

166 litres at 15 ml per 10 litres. The 500 ml bottle makes 333, the litre 666.

Does it replace my base nutrient?

No. It is added alongside the normal feed for one week, not instead of it.