CANNA PK 13/14 – Concentrated Flowering & Fruiting Booster

CANNA PK 13/14 is a highly concentrated blend of phosphorus and potassium developed to meet the increased nutritional demands of plants during the flowering and fruiting stage.

As plants move further into flowering, their requirements change. Phosphorus plays an important role in plant metabolism, energy transfer and flower cell development, while potassium contributes to nutrient and water transport, plant strength and sugar production.

CANNA PK 13/14 provides these two important macronutrients in a concentrated, readily available form at the point in the flowering cycle when plants require them most.

Why choose CANNA PK 13/14?

• Designed for the flowering phase – supplies additional phosphorus and potassium when demand increases.
• Supports flower & fruit development – formulated specifically for generative plant growth.
• Highly concentrated – only 15 ml is required per 10 litres of water.
• Readily available nutrients – CANNA formulates PK 13/14 so phosphorus and potassium are quickly available to the plant.
• Suitable for all growing media – use with soil, potting mixes, coco and hydroponic systems.
• Indoor & outdoor use – suitable across a wide variety of cultivation methods.
• Works alongside your base nutrient – designed as a short-term flowering supplement rather than a complete standalone feed.
• Pairs perfectly with CANNABOOST – the two additives perform different but complementary roles during flowering.

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Why phosphorus & potassium matter during flowering

A plant's nutritional requirements change significantly once flowering is underway.

Phosphorus (P) is an essential macronutrient involved in energy transfer and plant metabolism. During flowering, additional phosphorus supports the development and formation of flower cells.

Potassium (K) is involved in numerous plant processes, including the movement of water and nutrients and the production of sugars. These sugars become particularly important during flower and fruit development.

CANNA PK 13/14 provides additional P and K for the relatively short period when flowering plants have an increased requirement for these nutrients.

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How to Use CANNA PK 13/14

Shake the bottle thoroughly before use.

Add PK 13/14 to your normal nutrient solution at:

1 litre of water

1.5 ml CANNA PK 13/14

10 litres of water

15 ml CANNA PK 13/14

Dilution ratio: 1:666

CANNA recommends introducing PK 13/14 approximately three weeks before harvest, adding it to the full nutrient solution for 3–6 days.

Important

PK 13/14 is intended as a short-term flowering supplement, not something that should simply be increased or used continuously.

CANNA advises using PK 13/14 for no more than one week, helping avoid unnecessary accumulation of phosphorus and potassium in the growing medium.

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Use Alongside Your Regular Nutrient Programme

CANNA PK 13/14 is not a complete base fertiliser.

It should be added to an established nutrient programme during the appropriate stage of flowering.

For growers wanting to build a complete feeding system, we recommend exploring our:

Full CANNA Nutrient & Additive Range

Here customers can find the appropriate base nutrients and additives for soil, coco and other growing systems.

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Perfect Partner for CANNABOOST

CANNA specifically recommends combining PK 13/14 with CANNABOOST Accelerator.

The two products perform different roles:

PK 13/14 provides additional phosphorus and potassium during the period when flowering plants demand more of these nutrients.

CANNABOOST supports plant metabolism and is designed to complement the plant's regular flowering programme.

They are therefore complementary products rather than substitutes for one another. 

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Suitable for All Growing Media

CANNA PK 13/14 isn't restricted to one growing method.

It can be used with:

• Soil and potting mixes
• Coco coir
• Coco-perlite substrates
• Recirculating hydroponic systems
• Run-to-waste systems
• Indoor growing
• Outdoor growing

CANNA specifically describes PK 13/14 as suitable for every medium, including soil, coco, recirculating systems and run-to-waste cultivation. 

Explore our Soils & Growing Media

Whether they're looking for a specialist houseplant mix, living soil or a free-draining coco-based substrate, they can choose the growing medium that best suits their plants and feeding system.

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Storage & Care

• Shake well before use.
• Always dilute before application.
• Add to your normal nutrient solution.
• Avoid over-fertilising.
• Store tightly closed in a dark, frost-free location.
• Keep out of reach of children.

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Available Sizes

250ml – ideal for smaller growing setups or occasional use.

1L – suitable for regular growers and larger plant collections.

5L – economical option for larger-scale or frequent use.