Quick Answer

Two part flowering base, Bloom A (NPK 3-0-3) and Bloom B (NPK 1-5-6), mixed in equal parts.
Feed guide runs 4ml per litre early flower, stepping down to 2.5ml by week 8. Treat these as ceilings to build toward across the grow, not fixed starting doses.
Target EC depends on how dialled in your environment is and the cultivar you're running, use the feed guide dose as your reference point rather than chasing a fixed number.
Target pH 5.8 to 6.2 throughout.
Suits hydroponic, coco and soil systems.
Sizes: 1L, 5L, 20L, with 200L and 1000L available for commercial orders.

Australia's newest hydroponic nutrient line. Built with the highest quality minerals and made right here in Australia. The same level of mineral purity as the best imported brands, without the import price tag.

Phosphorus is what drives flower formation, potassium is what moves water and sugars through the plant while that flower mass is developing, and calcium keeps the new tissue structurally sound as it forms. PCS Bloom A&B delivers all three from week one of flower, with Bloom A carrying the nitrogen, potassium and calcium and Bloom B carrying the bulk of the phosphorus and additional potassium.

Running both together rather than either alone matters because a flowering plant genuinely needs all three simultaneously, not phosphorus without the potassium to move the resulting sugars, or potassium without the phosphorus actually driving flower development in the first place. The dosing tapers deliberately across the cycle too, easing off the base from week 4 as PK Plus takes on more of the load, which keeps the plant from being pushed harder on phosphorus and potassium than it can actually use as flower development progresses.

How to Use, Full Feed Guide

Mix Bloom A and Bloom B in equal parts into water, never combine the two concentrates directly before diluting.

Week	1	2	3	4	5	6	7	8	9
Bloom A&B	4ml	4ml	4ml	3ml	3ml	3ml	3ml	2.5ml	Flush

Treat every dose in this table as a ceiling to work toward rather than a fixed starting point. How much a plant can actually use at any given week depends on how stable your environment is and where the plant genuinely sits in its own development, both of which shift throughout veg and flower and rarely track a printed schedule exactly. Start conservatively and build up as root health and environmental stability prove themselves, rather than feeding to the top of the table from week one. Target pH sits at 5.8 to 6.2 across the full cycle. Flush with pH 6.0 adjusted water weekly, and in week 9 flush specifically with PCS Enzyme at 2ml per litre rather than plain water alone.

Suitable For

Hydroponic, coco and soil systems.

Frequently Bought Together

PCS PK Plus, steps in from week 1 and builds through mid flower as the Bloom A&B dose tapers, a separate concentrated PK layer rather than a duplicate of the base.
PCS Quality Enhancer, runs across the same feed guide to support flavour and finish, not another base nutrient.
PCS Cal-Mag + Fe, supplies calcium, magnesium and iron on top of the base through the full flowering cycle.

Frequently Asked Questions

Do I need to mix Bloom A and Bloom B in equal parts?

Yes. Bloom A carries nitrogen, potassium and calcium, while Bloom B carries the bulk of the phosphorus and additional potassium. Using one without the other leaves the formulation incomplete.

When do I switch from Grow A&B to Bloom A&B?

Switch at the start of flowering, typically when the light cycle changes to 12/12 for photoperiod plants or when pre-flowers appear on autoflowers.

Why does the Bloom A&B dose drop through the feed guide?

The base dose steps down from week 4 as PK Plus increases, moving a larger share of the phosphorus and potassium onto the dedicated bloom enhancer rather than the base nutrient alone.

Should I always feed to the top dose in the feed guide?

No. The feed guide numbers are a ceiling, not a fixed target. How much a plant can actually make use of depends on environmental stability and the cultivar you're running, both of which change how far up that ceiling you should actually go. Build up gradually rather than starting at the top of the table.