About Bloom Boosters and Flowering Additives
A bloom booster, also sold as a flower booster or flowering additive, is something you add to your base feed during flowering to support flower and fruit development. Some add extra minerals, some feed the plant's own metabolism and some are made just for the last few weeks before harvest. None of them replace your base nutrient.
This range covers early, mid and late bloom from Canna, Plagron, House & Garden, Monkey, Shogun, Mills, Dutch Pro, Hydrotops, BioBizz, Advanced Nutrients and Ionic, for flowering tomatoes, chillies, peppers, strawberries and flowers in soil, coco or hydro.
Free UK delivery on orders of £94.99 or more (large 19L to 25L containers have a delivery charge shown at checkout), price match, and Click & Collect from our West Bromwich store.
How to choose a bloom booster
Start with the stage of flowering you want to support, then check the booster works with your base feed. This table uses each maker's own description.
| Booster | Stage | What the maker says it is |
|---|---|---|
| Buddha's Tree Flower Burst | Before and into flowering | A super concentrated pre flowering booster |
| Canna Boost | From the start of flowering | A flowering stimulator that boosts metabolism rather than adding base nutrients |
| Hydrotops Floral Boost | Mid bloom, around weeks 3 to 6 | Extra phosphorus, potassium, magnesium and ammoniacal nitrogen for peak demand |
| Dutch Pro Explode | Throughout flowering, 0.5 to 1.5 ml per litre | NPK 0, 0, 4 with micronutrients, vitamins and organic acids |
| Plagron Sugar Royal | Throughout flowering | Amino acids and natural plant extracts for taste and aroma, without raising EC |
| Ionic Flower Boost | Throughout flowering | A plant based source of triacontanol with unsulphured molasses |
| BioBizz Top Max | Flowering | A 100% organic flowering strengthener with humic and fulvic acids |
| Plagron Green Sensation | Last 4 to 6 weeks | An all in one late bloom additive combining a PK booster, enzymes and flower stimulators |
| Advanced Nutrients Overdrive | Final weeks of flowering | Readily available phosphorus and potassium to keep flowers swelling up to harvest |
| House & Garden Top Shooter | Last 2 to 3 weeks | A concentrated finishing booster; also sold as Shooting Powder |
Want a straight phosphorus and potassium boost instead? See our PK boosters, including PK 13/14 and PK 9/18.
Bloom booster FAQs
What is the difference between a bloom booster and a PK booster?
A PK booster adds extra phosphorus and potassium. Bloom boosters are a wider group: some add minerals, like Hydrotops Floral Boost, while others work on the plant's metabolism or flavour, like Canna Boost and Plagron Sugar Royal, which Plagron says works without raising EC.
When should I start a bloom booster?
Follow the maker's stage. Buddha's Tree Flower Burst is a pre flowering booster, Hydrotops Floral Boost is for around weeks 3 to 6, Plagron Green Sensation is for the last 4 to 6 weeks and House & Garden Top Shooter is for the last 2 to 3 weeks.
Can I use more than one booster?
Many brands design their boosters to run together on a feed chart, but some should not be stacked. Plagron says Green Sensation already contains PK and should not be combined with another PK booster. Our guide to reading a nutrient feed chart shows how boosters fit around a base feed.
Is there an organic bloom booster?
Yes. BioBizz Top Max is a 100% organic flowering strengthener, and Guanokalong Powder is a 100% organic flowering strengthener that you mix into soil or top dress. See the full BioBizz range.
Do bloom boosters replace base nutrients?
No. Every product here is used alongside your base nutrients. Add boosters after your base feed, then check EC and pH.
Browse all additives and boosters or see the full hydroponic nutrients and boosters range.
Need advice? Visit our West Bromwich store, call 0121 553 7872 or WhatsApp our experts.