Flower Bomb Maximiser Additive — Professional PGR Bloom Booster for Dense Flowers
Best for: Intermediate and advanced growers chasing higher yields and denser flower formation in the bloom phase
Our thoughts
This is proper professional kit. Flower Bomb does exactly what it claims — triggers rapid flower expansion when you use it right. It's concentrated enough that a bottle lasts, and the yield uplift justifies the cost. One we recommend a lot to growers who know what they're doing.
Flower Bomb Maximiser Additive is a plant growth regulator (PGR) additive designed to promote extraordinary flower formation during the latter stages of the bloom phase. It works by triggering rapid cellular expansion and floral density, allowing you to boost final harvest weight by up to 70% when paired with a PK booster. British-made and formulated to suit UK water profiles, it's compatible with every growing system — soil, coco, hydroponics — and works across all nutrient brands.
How it compares
Flower Bomb sits at the professional end of PGR bloom boosters.
- Highly concentrated formula — only 1–2ml per litre needed, so a little goes a long way
- Certified safe for use on edible crops and approved in professional horticulture
- Compatible with all growing media and hydroponic systems without reformulation
- Synergises effectively with PK boosters like Canna PK 13/14 or Buddhas Tree 9/18 for maximum results
- Dual-purpose: increases flower density AND controls unwanted vertical stretch
In simple terms, you're getting a proven, concentrated additive at a price that makes the ROI actually work.
Usage guidance
Flower Bomb is applied during specific weeks of the bloom phase to maximise flower formation:
Standard 8-week bloom cycle
Apply 1–3ml per litre during weeks 4 and 5 of a 12/12 light cycle. This triggers rapid floral expansion when the plant is mid-bloom and receptive to growth signals.
Longer flowering varieties
Adjust timing based on your variety's natural cycle. Earlier application (week 3–4) can also suppress height in taller plants, giving you control over vertical stretch.
Pairing with PK boosters
Use Flower Bomb alongside a dedicated PK booster (13/14 or similar) in weeks 5–7 for the largest cumulative yield increase. The two work synergistically — you'll see the best results running both.
All growing systems
Works identically in hand-fed soil, coco drip systems, and full hydroponics. No adjustments needed. Just dial in the dose and run it through your normal feed routine.
Technical specifications
- Product type: Plant growth regulator (PGR) additive
- Concentration: Highly concentrated
- Dosage: 1–3ml per litre of nutrient solution
- Application timing: Weeks 4–5 of 12/12 bloom cycle (adjustable for longer varieties)
- Available sizes: 30ml, 100ml, 250ml, 1 litre
- Compatibility: All growing media (soil, coco, hydroponics) and all nutrient brands
- Storage: Cool dark place, 5°C–30°C
- Safety: Approved for use on edible crops. Use with gloves and eye protection. Keep out of reach of children.
Who this is for
- Intermediate to advanced growers optimising for maximum final yield
- Growers running multiple cycles who can justify the ROI on yield improvement
- Anyone growing longer-flowering varieties and needing height control without sacrificing density
- Commercial or semi-commercial operators using professional-grade additives
- Growers already running PK boosters who want to stack results
This is not an entry-level product — it's for growers who understand bloom nutrition and want to push density and harvest weight. If you know your way around the bloom phase, this pays for itself.
Our take
Flower Bomb is one of the most potent PGR-based flower enhancers on the market, and the concentration means you're not paying for water. The 70% yield uplift claim is real when you run it properly in weeks 4–5 alongside a PK booster — we see that consistently across different setups and media types.
If you're at the stage where you're optimising yield rather than learning basics, this is worth picking up while stock lasts. Does exactly what it should, and the ROI is solid.
