Bloom Grow A and B 1L bottles, two-part coco veg base nutrient set by Bloom Advanced Floriculture

Grow A&B by Bloom — Two-Part Coco Base Nutrient for Vegetative Growth

BLOOM-GROW-SET-1

$29.95
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Two-part coco base nutrient for veg, sold as an A + B set in every size. 1–2ml per litre of each part, in equal amounts, from seedling to the flip.

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Pairs well with

Veg is where you build the frame the flowers will hang on, and the base feed does most of that work. Grow A&B by Bloom is a two-part base nutrient made in South Australia and tuned for coco: Part A carries the nitrogen, calcium and chelated iron, Part B the phosphorus, potassium, magnesium and trace elements, with vitamin B1 in A and humic acid in B. You run them in equal parts at 1–2ml per litre each from seedling through veg, then switch to Flower A&B at the flip, and at 2ml per litre a litre of each part makes 500 litres of feed. It's the base the Bloom veg additives sit on. Bloom labels it for coco and doesn't publish soil or hydro rates, and it isn't certified organic.

Every size is an A + B set. You get one bottle of Part A and one of Part B in the size you pick, so the 1L set is 2 × 1L bottles and the 25L set is 2 × 25L drums. The two parts only work together, in equal amounts.
Two parts, one complete feedPart A brings nitrogen, calcium and iron; Part B brings phosphorus, potassium, magnesium and trace elements. Equal parts, every feed.
Tuned for cocoBloom balances it for the way coco holds and releases feed, and labels it as a coco base.
Chelated trace elementsIron as EDDHA in Part A; copper, iron, manganese and zinc as EDTA chelates in Part B.
A set in every sizeOne Part A and one Part B in every size, from 2 × 1L for a tent to 2 × 25L drums for a room.
1L of each makes 500LAt 2ml per litre per part, the 1L set makes 500 litres of feed and the 2.5L set makes 1,250.
The base for Bloom's veg programRoots, Pre and Organic Sweet sit on top of it in veg, then Flower A&B takes over at the flip.

Specifications
Brand: Bloom (Agricultural Organics)
Type: Two-part vegetative base nutrient (coco)
Part A NPK: 9 - 0 - 7
Part B NPK: 2 - 3.1 - 9
Part A inputs: Potassium nitrate, calcium nitrate, ammonium nitrate, iron EDDHA, vitamin B1
Part B inputs: Monopotassium phosphate, potassium nitrate, magnesium sulfate, chelated copper, iron, manganese and zinc (EDTA), boric acid, sodium molybdate, humic acid (leonardite)
Rate: 1–2ml per litre of each part, in equal amounts
When to use: Seedling through veg, every feed; switch to Flower A&B at the flip
Yield: 1L of each part makes 500L of feed at 2ml/L
Built for: Coco
In each size: One bottle of Part A and one of Part B
Sizes: 2 × 1L, 2 × 2.5L, 2 × 15L, 2 × 25L
Made in: South Australia
Biodegradable: Yes, 100% (manufacturer)
Certified organic: No

Grower's Tip
  • Add Part A to the water and stir it through before Part B goes in. Never pour the two concentrates together undiluted.
  • Running Silica? It goes in first, into plain water on its own, before Part A.
  • Start at the low end of the 1–2ml per litre range on seedlings and fresh transplants, then build to the full 2ml per litre per part through veg.
  • Keep A and B equal. Running more of one part than the other throws the whole feed out of balance.
  • Add your additives after the base, then check EC and adjust pH last.
  • Grow A&B is a veg base. Switch to Flower A&B with the first feed after you change to your flowering light schedule.

How To Use It
1Fill your reservoir with plain water. If you run Silica, add it first and stir it through.
2Add Part A at 1–2ml per litre and mix thoroughly.
3Add the same amount of Part B and mix thoroughly.
4Add any additives, then check EC and adjust pH last.
5Feed every watering through veg, building up to the full 2ml per litre per part, and switch to Flower A&B at the flip.

Pairs Well With

Frequently Asked Questions
Do I get both Part A and Part B?

Yes. Every size is a set of one Part A and one Part B in that size, so the 1L set is 2 × 1L bottles and the 25L set is 2 × 25L drums.

Can I use Part A or Part B on its own?

No. They're two halves of one feed and only work together, in equal amounts.

How much Grow A&B do I use?

1–2ml per litre of each part, in equal amounts. Bloom's full rate is 2ml per litre of A plus 2ml per litre of B.

Why are A and B in separate bottles?

Because the calcium in Part A would react with the phosphate and sulfate in Part B if they were packed together as concentrates. Keeping them apart keeps everything in solution until you dilute it.

When do I switch to Flower A&B?

At the flip. Grow A&B is the veg base, and Flower A&B takes over with the first feed on your flowering light schedule.

Can I use it in soil or hydro?

Bloom builds and labels it as a coco base and only publishes its rates for coco. If you're feeding soil or a recirculating system, talk to us before you buy and we'll help you pick the right base.

How long does a set last?

At 2ml per litre per part, the 1L set makes 500 litres of feed, the 2.5L set 1,250 litres, the 15L set 7,500 litres and the 25L set 12,500 litres.

Is it certified organic?

No. It's a mineral base nutrient, and Bloom's range is not certified organic, so we don't sell it as organic.

Select Set Size

Build the Frame Before the Flip

Free shipping over $499* on bottles up to 2.5L. 15L and 25L drums ship at freight rates.

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