PHAT · Flower enhancer
Build the bud.
Set sites are just potential. PHAT is the mid-flower bulker that turns them into heavy, dense, structured buds — weeks 3 to 4 of flower, when it counts.
Australian-made · 26 years in the US · N-P-K 0.0051–0.5258–0.0143
Why it matters
Sites are potential. PHAT is weight.
The flip sets your sites; the mid-flower weeks decide how heavy they finish. PHAT drives the swell that puts on real, dense weight.
Heavy, dense bud
Turns set sites into weight, not just size.
A phosphorus-driven swell
Fuels the cell expansion that puts on bulk.
Structure, not fluff
Tightens and hardens the bud through the mid-flower window.
What’s in the bottle
Two kelps. Real bulk.
Here’s what’s actually in it — read straight off the current bottle — and what each part does through the mid-flower swell.
Laminaria japonica Kombu / Japanese kelp
A brown kelp bringing alginates, mannitol, iodine and natural growth compounds — part of the phosphorus-forward push behind the mid-flower swell.
alginatesmid-flower swell
Lessonia nigrescens Chilean bull kelp (huiro)
A second brown kelp, harvested off Chile, adding its own high alginate content and growth compounds — backing the density and structure PHAT builds into the bud.
alginatesstructure
Boric acid + sodium molybdate Boron · molybdenum
Two mineral salts declared on the label — boron and molybdenum, both trace nutrients the plant needs in small amounts through the bulk window.
boronmolybdenum
Humic acid + B1 Leonardite humic · thiamine
Humic acid keeps minerals available so the plant takes them up efficiently through the bulk window, with a touch of vitamin B1 alongside.
humic acidvitamin B1
What growers are seeing
Chunky. By the chop.
“The Phat charged my plants with a noticeable swell on bud size and significant frost — definitely better than my old go-to bloom booster.”
@jacksonbinan
Verified grower review · shared via Instagram
“Ultra weeks 1–2, then Phat — finishing early with major bulk.”
@greendiamondgarden_est2015
“Bloom’s Phat made this round of flower extra chunky.”
@ich
“Loving the Phat — it’s making the plants nice and lush.”
@apollos_oasis
Why growers switch
A base alone vs. the bulk.
A base feed alone
✗
Feeds maintenance, not bulk.
✗
Sites stay small through mid-flower.
✗
No phosphorus surge for the swell.
✗
Good buds — not heavy ones.
Base + PHAT
✓
A phosphorus-forward bulk surge.
✓
Sites swell into dense, structured bud.
✓
Mid-flower density, not just size.
✓
A heavier, harder finish.
A little goes a long way
1 L → 400 L
of finished feed at 2.5 ml/L — the mid-flower weeks that decide how heavy the bud finishes.
Proof — label & MSDS
Straight off the label.
N – P – K
0.0051 · 0.5258 · 0.0143
Type
Flower enhancer
Dose
2.5 ml/L
Made in
Australia
Twin kelp + boron + molybdenum + humic
100% biodegradable
pH 8–10
By Agricultural Organics, South Australia
N-P-K from the product label. Composition and properties from the manufacturer MSDS.
When to use it
Mid-flower. Weeks 3 to 4.
Veg
Flip
Bulk wk 3–4
Late flower
Flush
Weeks 3–4 of flower, weekly2.5 ml/L
Soil / coco / hydroany medium
Hand from ULTRA, into OOZEthen finish
Fill the frame.
Bank the weight.
Shop PHAT →
Or DM FEED CHART to @bloom_crew_nate for your full feed schedule.
Keep reading
Ooze: the back half of flowerWeek 5 to the flush, on its own page
PHAT builds the canvas, OOZE paints itFrom the blog: the timing of the two
Ultra first (weeks 1 to 2)The bottle that hands into Phat
Then OozeWeek 5 to the flush, the back half of flower
FROST revisited: layer, don’t replaceFrom the blog
Images on this page are a mix of real photos and AI-generated illustrations, used to show how things work.