House & Garden Top Booster - PK Additive for Bigger, Denser Flowers
Best for: growers in the early-to-mid flowering stage who want a short, sharp PK boost to increase flower size and density.
Our thoughts
Top Booster is a short-course product, not a season-long additive, so don't dose it constantly and expect it to keep working. Use it for the week it's designed for and you'll see the point of it. Just don't combine it with Top Shooter or other PK boosters at the same time, House & Garden are clear that stacking them isn't the way to get better results.
House & Garden Top Booster is a PK additive built to increase flower formation, bud size and final yield quality during flowering. It supplies highly available phosphorus and potassium along with added iron for foliage health, giving plants the extra P and K they demand during peak bloom without diluting the rest of the feeding programme.
It's designed to be used for a short window, typically 3 to 4 days during the early-to-mid flowering stage, around week 5 or 6, rather than continuously through bloom. Used correctly alongside the rest of the House & Garden range, it's aimed at improving flower density, weight and structure rather than acting as a general-purpose flowering nutrient.
How it compares
Top Booster sits in the well-established PK booster category alongside some of the biggest names in flowering additives.
- Versus CANNA PK 13/14: both are classic phosphorus/potassium boosters used for a short burst during flowering; Top Booster adds iron to the mix for foliage support.
- Versus Advanced Nutrients Big Bud: Big Bud is marketed as a broader bloom-boosting formula, while Top Booster is a more targeted, short-duration PK hit.
- Versus House & Garden's own Top Shooter: Top Shooter is the later-stage, more potent sibling used in the final 3 weeks before harvest; Top Booster is used earlier and shouldn't be combined with it.
A focused, no-nonsense PK product rather than a do-everything bloom formula, which suits growers who already have their base feeding sorted and just want a targeted flower boost.
Usage guidance
Timing and dosage both matter more with Top Booster than with a standard base feed.
Dosage
Use at around 1.5ml per litre of nutrient solution.
Timing
Apply for 3 to 4 days during early-to-mid flowering, roughly week 5 or 6 of the flowering cycle, not for the whole bloom period.
What to avoid
Don't combine with Top Shooter, PK 13/14 or Shooting Powder at the same time, House & Garden specifically warn against stacking PK boosters.
Technical specifications
- Type: PK flowering booster additive
- Key nutrients: Phosphorus, potassium, added iron
- Dosage: Approx. 1.5ml per litre
- Application window: 3-4 days, early-to-mid flowering (week 5-6)
- Compatible media: Soil, coco, hydroponic
- Format: Liquid concentrate
- Sizes available: 500ml, 1 litre, 5 litre
- Manufacturer: House & Garden, Netherlands
Who this is for
- Growers who already run a base House & Garden (or compatible) feeding programme
- Anyone wanting a targeted mid-flower PK push rather than a general bloom booster
- Growers comfortable following a specific short dosing window rather than a flat daily dose
Not intended to be used at the same time as Top Shooter or other PK finishers.
Our take
Top Booster does one job for a short window, pushing phosphorus and potassium availability right when the plant is building flower structure, and it does it without overcomplicating the rest of your feed.
Does exactly what it should, day in, day out, provided you follow the timing.
