Cyco Swell Late Flowering PK Bloom Booster
Cyco Swell Late Flowering PK Bloom Booster
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Order by 3pm Mon–Thu for next-working-day delivery · FREE delivery over £50 · Free Wembley pickup
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Push the Bloom Cycle to Its Full Potential
Cyco Swell is a flowering booster built around three elements that do the heavy lifting late in the cycle. The phosphorus plays an essential part in photosynthesis, assists maturation and helps the plant withstand stress, increasing growth and encouraging bloom. The potassium enhances fruit quality, and the magnesium activates the plant enzymes needed for growth. It is recommended for the later flowering stages, where P and K demand climbs sharply.
Key Benefits
- Phosphorus for photosynthesis and maturation, supporting the plant through the final swell
- Potassium to enhance fruit quality, improving density and finish
- Magnesium to activate growth enzymes, keeping late-flower leaves working
- Targeted at the later flowering stages rather than being run all cycle
- Maximises the bloom cycle alongside your existing base nutrients
Airy Flowers That Never Fill Out
Late flower is where a lot of grows quietly lose weight. Phosphorus and potassium demand rises just as roots become less efficient, and if the feed does not follow, flowers stay light and airy and yields come in below what the canopy promised. A dedicated P and K source with magnesium alongside keeps enzyme systems and sugar transport running while the plant fills.
How to Use
- Soil and coco: add to the reservoir at the rate on the Cyco feed chart for your current bloom week, after base nutrients
- Hydroponics and recirculating systems: add at the same chart rate, stir the tank thoroughly and check EC before feeding
- Timing: introduce in the later flowering stages and taper off before your final flush
- Mixing order: base feed first, then Swell, mixing fully between additions
- pH: set to 5.5-6.0 for hydro and coco, or 6.2-6.5 for soil, after everything is mixed
Technical Specifications
- Key elements: Phosphorus, potassium, magnesium
- Stage: Later flowering stages
- Role: Bloom booster, used alongside a base feed
- Phosphorus function: Photosynthesis, maturation, stress tolerance
- Potassium function: Fruit quality
- Magnesium function: Activates plant enzymes
- Suitable for: Soil, coco and hydroponic systems

Free next-day delivery on orders over £50 (order by 3pm Mon–Thu). Heavy-item surcharges are always shown at checkout before you pay — we only ever charge what delivery costs us. Prefer to collect? Free pickup at our Wembley store.