Spray2Grow Gnat Off Root Drench – Fungus Gnat Killer
Spray2Grow Gnat Off Root Drench – Fungus Gnat Killer
£59.99 per litre · 5L
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Order by 3pm Mon–Fri — we aim to post same day · FREE Express Delivery over £60 · 1–2 working days · Free Wembley pickup
- 14-day returns
- Price match promise
- Free Wembley store pickup
- Advice from the team: 020 3488 0419
Description
Stop Fungus Gnat Larvae Before They Damage Roots
Spray2Grow Gnat Off is an organic root drench that instantly kills fungus gnat (sciarid fly) larvae in the growing medium, then breaks down into plant-safe nutrients within hours of application. It is a soil sterilant rather than a foliar spray, so it targets the maggots feeding on roots rather than the adult flies buzzing around the canopy.
Key Benefits
- Insta-Kills Larvae – highly potent formula knocks down fungus gnat maggots in the root zone on contact
- Breaks Down Safely – converts to plant-safe nutrients within hours, leaving no harmful residue
- Speeds Recovery – helps roots recover quickly after an infestation has been brought under control
- Certified for Organic Growing – safe to use on organic crops
- Works in Any Medium – suitable for soil, coco and hydroponic root zones
Fungus gnat larvae feed on fine root hairs and organic matter in wet growing media, and a heavy infestation shows up as stunted growth, wilting and poor nutrient uptake long before the adult flies become obvious. Drenching the root zone stops the larvae at source instead of only knocking down the adults you can see.
How to Use
- Apply as a root drench directly to the growing medium, soaking the area where fungus gnat larvae are active.
- Use at the first sign of larvae or as a preventative drench when conditions are consistently damp.
- Safe for use on organic crops; the concentrate breaks down to plant-safe nutrients within hours of application.
- Repeat if a fresh infestation appears, particularly after overwatering or in humid grow rooms.
- Format: concentrated root drench
- Target: fungus gnat (sciarid fly) larvae
- Suitable media: soil, coco, hydroponic root zones
- Organic growing: suitable

FREE Express Delivery on orders over £60. We aim to post same day on Express Delivery — order by 3pm Mon–Fri — and delivery takes 1–2 working days. A few harder-to-stock or large, bulky items can take a little longer — we'll tell you if that applies to your order. 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.
