House & Garden Shooting Powder — Late-Stage PK Bloom Booster for Hydroponics
Best for: Growers wanting measurable yield increases in the final three weeks of flowering without overcomplicating their nutrient schedule
Our thoughts
Shooting Powder does what it says on the tin — it triggers a secondary growth phase when your plants should be winding down. House & Garden make solid kit, and this sits in that premium-but-purposeful bracket. It's not cheap, and it divides opinion, but if you're serious about maximising yield in those final weeks, it's worth understanding how it works and why growers keep coming back to it.
House & Garden Shooting Powder is a concentrated phosphorus and potassium bloom booster supplied in easy-to-mix sachets, designed to trigger a late surge of flower development during the final three weeks of the growing cycle. Rather than simply fattening existing blooms, Shooting Powder signals your plants to produce an entirely new layer of growth over what's already forming — the result being significantly larger, denser flowers and measurable yield increases. It's a targeted, high-impact additive for growers running precision hydroponic setups who want proper results.
How it compares
Shooting Powder sits at the premium end of the PK booster market, with some clear trade-offs.
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Vs cheaper alternatives (MOAB, Bloombastic): Similar yield results, higher cost, but House & Garden reputation and concentrated formula mean smaller application volumes and easier integration into existing feeds
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Vs liquid boosters (KoolBloom, Top Shooter): Powder format is easier to store, travels better, and mixes reliably; some growers prefer liquids for convenience
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Vs general bloom boosters: Shooting Powder is specialised for the final three-week window only — not a full-cycle product — which means you run it alongside your base nutrients, not instead of them
In short: you're paying for concentration, brand heritage, and a formulation that's been tested to work. Whether that premium is worth it depends on your budget and your commitment to yield maximisation.
Usage guidance
Shooting Powder is mixed into your feed water during the final three weeks of flowering. The sachets are designed for 100-litre batches.
Week one of final stage
Add 1 sachet to 100 litres of feed water. This triggers the secondary growth phase.
Weeks two and three
Increase to 2 sachets per 100 litres. This sustains the growth surge through to finish.
Base nutrient adjustment
Reduce your standard base nutrient strength slightly when running Shooting Powder — you're adding significant phosphorus and potassium, and overfeeding at this stage will cause problems. This is where growers trip up.
Media compatibility
Works in hydroponics, coco, and all inert media. This is a water-soluble powder with no synthetic plant growth regulators, so it integrates cleanly into any precision feeding programme.
Mixing tip
Break up any lumps in the sachet before mixing — powder can compact in storage. A quick squeeze and shake will help it dissolve smoothly into your water.
Technical specifications
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Format: Powdered sachets, 65g per sachet
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NPK Ratio: 0-39-25 (high potassium and phosphorus, zero nitrogen)
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Active composition: Potassium Sulfate, Potassium Carbonate, Potassium Phosphate
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Application rate: 1 sachet per 100 litres (week 1); 2 sachets per 100 litres (weeks 2-3)
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Synthetic PGRs: None — formulation relies on nutrient chemistry, not hormones
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Heavy metals: Non-detectable
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Storage: Keep sealed, 7–29°C, use within one year of opening
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Media compatibility: All growing media — hydroponics, coco, rockwool, soil-based systems
Who this is for
- Hydroponic growers running multi-stage nutrient programmes and looking to squeeze measurable yield increases
- Commercial or semi-commercial cultivators where yield per cycle directly impacts return
- Experienced growers already familiar with base nutrients and ready to layer in targeted boosters
- House & Garden customers building out a complete nutrient line with aligned products
- Anyone prepared to dial in their base nutrient slightly lower to accommodate a high-concentration PK additive
Not ideal for: Beginners still learning their base nutrient, or growers uncomfortable making mid-cycle adjustments.
Our take
Shooting Powder is proper kit made by a brand that knows what they're doing. The mechanism is sound — triggering a secondary growth phase in the final weeks absolutely can deliver 20–30% yield increases, and plenty of growers swear by it. The cost is real, and cheaper alternatives do exist, but you're paying for a concentrated formula that integrates properly and a track record that holds up.
The key is respect: this is a specialist product that demands attention to your base nutrient strength and strict application windows. Run it half-arsed and you'll waste money. Run it properly and you'll see why House & Garden have such a loyal following. Worth picking up if you're serious about maximising your final weeks — just go in with your eyes open and don't skip the base nutrient adjustment.
