Atami Bloombastic - High-PK Finishing Booster for the Last Weeks of Bloom
Best for: growers in the final weeks of flower who want a concentrated phosphorus and potassium push to finish flowers denser and heavier before harvest.
Our thoughts
Bloombastic is Atami's premium finisher, not their everyday bloom additive - that's the B'Cuzz Bloom Stimulator, which is a different, cheaper product for a different stage. This one is thick, concentrated, and meant for the last stretch of flower only, so a little goes a long way and you don't need much of it per plant.
Bloombastic is a highly concentrated PK booster from Atami's premium Bastics range, formulated with a high phosphorus and potassium content (broadly in the region of PK 14-15% w/w) alongside amino acids, plant extracts and micronutrients including iron. It's designed to be used in the last few weeks of flowering, when demand for phosphorus and potassium peaks as flowers fill out and ripen.
The formula is noticeably thick and needs a good shake before use. Atami's own guidance is not to combine it with other PK-type boosters at the same time, since stacking multiple concentrated PK products risks over-fertilisation rather than adding any extra benefit.
How it compares
Bloombastic sits at the premium end of the finishing-booster category, going up against the best-known names in late-flower PK boosters.
- Directly comparable to Canna PK 13/14 and House & Garden Bud-XL - all three are concentrated late-flower PK finishers used in the final weeks only.
- Also comparable in role to Advanced Nutrients Overdrive, another concentrated bloom-phase booster aimed at finishing weight and density.
- Sits above Atami's own B'Cuzz Bloom Stimulator in both concentration and price - that's the everyday additive, this is the finisher.
If you want a full-cycle bloom additive, B'Cuzz Bloom Stimulator is the better fit; if you want a short, sharp push in the final weeks before flush, Bloombastic is built for exactly that.
Usage guidance
Bloombastic is used late and briefly, not from the start of flower.
Dosage
Use 0.5-1ml per litre of water. Start at the lower end and only increase toward 1ml/L once you've confirmed your plants tolerate it.
Timing
Introduce it for roughly the last 4 weeks of flowering, through to the point you begin flushing.
Mixing
Shake the bottle thoroughly before each use, as the concentrate settles. Don't dose it alongside other PK-type boosters in the same feed.
Technical specifications
- Format: Highly concentrated liquid PK booster
- PK content: Approx. PK 14-15% w/w
- Additional ingredients: Amino acids, plant extracts, micronutrients including iron
- Dosage: 0.5-1ml per litre of water
- Timing: Last 4 weeks of flowering, through to flush
- Sizes available: 100ml, 325ml, 1.25 litre, 5.5 litre
- Range: Atami Bastics (premium line)
- Compatibility note: Not recommended alongside other PK boosters
Who this is for
- Growers in the last month of flower looking to add finishing weight and density.
- Anyone already using a B'Cuzz or other base nutrient line who wants a dedicated late-flower PK boost.
- Growers who prefer a single concentrated finisher over stacking several bloom additives.
Best suited to the final 4 weeks of bloom rather than full-cycle use.
Our take
It's a serious, concentrated finisher rather than a general bloom additive, and it's priced and dosed accordingly - a small bottle covers a lot of late-flower feeds. The instruction not to stack it with other PK boosters is worth taking seriously; more isn't better here.
If you're looking to add finishing density in the last stretch before flush, this is a proven way to do it. One we sell a lot of for growers wanting a stronger finish.
