Quick Answer

Concentrated bloom enhancer, NPK 0-18-14, straight phosphorus and potassium with nothing else in the mix.
Runs alongside Bloom A&B from week 1 of flower, building to a peak at week 4 to 5 before tapering off by week 7.
Not a standalone bloom feed, this is a supplemental layer on top of a base nutrient, not a replacement for one.
Suits hydroponic, coco and soil systems.
Sizes: 1L, 5L, 20L, with 200L and 1000L available for commercial orders.

Same high grade inputs as the more expensive imported brands, manufactured right here in Australia, without the import price tag.

Phosphorus is the element behind the energy transfer that actually drives flower formation, and potassium is what moves the sugars and water a developing flower needs to bulk out once that formation is underway. PCS PK Plus supplies both at a concentration built to layer directly on top of a flowering base, with no nitrogen or trace elements diluting the dose.

Demand for both climbs as a plant moves deeper into flower, which is why the dosing in the feed guide is not flat. Building the dose through weeks 3 to 5 rather than holding a constant rate gives the plant more phosphorus and potassium precisely when flower development is drawing on them hardest, and tapering off again by week 7 avoids pushing more into the plant than it can still put to use as that development slows. The practical result of following the taper rather than a flat dose is fuller, more completely developed flowers rather than just a larger volume of underdeveloped ones.

How to Use, Full Feed Guide

Week	1	2	3	4	5	6	7	8	9
PK Plus	0.5ml	1ml	1.5ml	2ml	2ml	1.5ml	1ml	-	Flush

Add alongside Bloom A&B in the same reservoir. Follow the taper rather than holding week 4 and 5's peak dose through the rest of flower, the step down in weeks 6 and 7 matters as much as the step up did earlier.

Suitable For

Hydroponic, coco and soil systems.

Frequently Bought Together

PCS Bloom A&B, the base nutrient PK Plus is layered on top of, not a substitute for.
PCS Quality Enhancer, runs the same feed guide window for flavour and finish, a different job to PK Plus's phosphorus and potassium load.
Bluelab Combo Meter, worth checking EC after adding PK Plus, since it is a genuine concentrate and will move the reading.

Frequently Asked Questions

Do I use PK Plus instead of Bloom A&B?

No. PK Plus is a supplemental phosphorus and potassium layer added on top of the base nutrient, not a replacement for it.

When do I start using PK Plus?

From week 1 of the flowering feed guide, at a low dose that builds through weeks 3 to 5 before tapering off by week 7.

Can I keep PK Plus at the same dose the whole way through flower?

The feed guide is built around a rise and fall across the cycle rather than a flat dose, running it at a constant rate misses the point of the taper and risks overfeeding phosphorus and potassium late in flower when demand is dropping and the plant can no longer put the extra to use.