Cultured Labz ROIDZ Natural PGR Bloom Booster
Cultured Labz ROIDZ Natural PGR 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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Natural Power. Serious Flower Density.
ROIDZ is a high-strength bloom additive built to maximise flower production, stack on weight and drive faster development through peak flowering. It uses natural, plant-derived PGRs alongside amino acids, trace elements and fulvic acid, delivering fast results without the harsh synthetics some growers will not touch. Used early it reins in vertical growth and tightens structure; used late it goes after density at the stage that decides final quality. Dosed at 1-2ml per litre, it slots in alongside most PK boosters rather than replacing them.
Key Benefits
- Natural plant-derived PGRs instead of harsh synthetic growth regulators
- Controls stretch when applied early, keeping internodes tight and the canopy even
- Builds flower density and adds late weight when applied through peak bloom
- Aminos, trace elements and fulvic acid support uptake as well as structure
- Suits indoor and greenhouse growers chasing top-shelf density
Excessive Stretch and Light, Airy Flowers
Two problems account for most disappointing bloom results. First, stretch: plants run away in the opening fortnight of flower, internodes open up and lower sites never see enough light. Second, airy buds that set but stay soft, so the harvest weighs far less than it looked like it would. ROIDZ addresses both, depending on when you apply it - early for structure, late for density.
How to Use
- To control stretch: apply 1-2ml per litre in weeks 2 and 5 of flower to reduce vertical growth and build early structure
- To target density: apply 1-2ml per litre in weeks 5 and 6, the most critical stage for flower development
- Mixing: add to a filled tank after your base feed and PK, stir, then check and correct pH for your medium
- Start low: begin at 1ml per litre on a new strain and move up only if the plant handles it
Technical Specifications
- Product type: High-strength bloom additive
- Active approach: Natural, plant-derived PGRs
- Also contains: Amino acids, trace elements, fulvic acid
- Dose rate: 1-2ml per litre
- Timing, stretch control: Weeks 2 and 5 of flower
- Timing, flower density: Weeks 5 and 6 of flower
- Compatibility: Works alongside most PK and bloom additives
- Best for: Indoor and greenhouse growers, including natural-leaning setups

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.