Description
CANNA PK 13/14 1L is the classic phosphorus and potassium flowering booster from CANNA that has been a staple of high-yield growing programmes in UK cultivation since its introduction. We have been recommending CANNA PK 13/14 to UK growers since 2017 as a powerful, well-understood flowering additive that consistently produces measurable improvements in bud density and weight when applied correctly.
Why PK 13/14 Accelerates Flower Production
During the peak flowering phase, plant energy demand shifts dramatically toward reproductive output. Phosphorus (P, atomic weight 13 in CANNA’s naming convention) drives the energy transfer mechanisms that fuel rapid cell division in developing flower structures, while potassium (K, atomic weight 14) regulates osmotic pressure, activates key enzymes involved in sugar synthesis, and directly contributes to the density and weight of ripening flowers. Standard base nutrients provide phosphorus and potassium throughout the grow cycle, but at the specific flowering peak — typically weeks 3–5 of a 8-9 week flowering cycle — a targeted, concentrated PK boost delivers these elements at levels that accelerate the plant’s natural flowering acceleration. CANNA PK 13/14 has a decades-long track record of delivering this effect reliably across soil, coco, and hydroponic growing media.
Application Protocol and Integration with the CANNA Range
CANNA recommends applying PK 13/14 for a single one-week period during peak flowering — typically around week 3–4 of the flowering phase when flower sites are actively developing but before they begin to mature and ripen. Introduce at the recommended dose on the CANNA feed chart alongside your regular base nutrient, then discontinue and return to base nutrients for the remainder of the cycle. Using PK 13/14 for too long or at excessive doses can lead to nutrient lockout — precision and timing are everything. The 1L bottle provides multiple crop treatments for home growers. CANNA PK 13/14 is fully compatible with CANNA Terra, CANNA Coco, and CANNA Aqua base nutrient ranges. For the final pre-harvest phase, transition to CANNA Flush or Ripen to complete your programme. Browse our full CANNA nutrient and additive range for the complete growing system.
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