Ed Rosenthal's Zero Tolerance Concentrate by Ed Rosenthal — Organic Herbal Concentrate for Thrips, Mites & Fungus Gnats
ER-PEST-ZT-250CONC
Pairs well with
Ed Rosenthal's Zero Tolerance Concentrate is the high-volume, dilute-your-own version of the iconic herbal pesticide trusted by organic growers across Australia. Same OMRI-listed food-grade oils of cinnamon, clove, rosemary, and thyme — this time in a concentrated format so you can dial the strength to suit seedlings, mature plants, or prop domes, and treat rooms the aerosol just can't keep up with. 1L makes up to 40L of finished spray; 250ml makes up to 12.5L. Kills on contact, repels for ongoing pressure, leaves no residue at harvest.
Specifications
- Dilution rates vary by plant maturity. Use lighter concentrations (around 20ml/L) on young plants and cuttings; stronger (around 40ml/L) on established canopies. Always test a single leaf first.
- Shake the concentrate well before every pour — the essential oils will separate during storage.
- Mix only what you'll use in one session. ZT works best fresh; leftover diluted spray loses potency within 24 hours.
- Use ZT preventatively. Spray tent walls, zippers, and the inside of propagation dome lids to create a residual pest barrier — cheaper than treating an outbreak later.
- Spray lights-off or well-dimmed. Hot leaves plus essential oils is the recipe for burn marks you didn't want.
- Pair with beneficial predators 3–4 days after your last application. Because ZT leaves no residue, predators move straight in and handle any pests that re-emerge.
How to Mix & Apply
Pairs Well With
The grab-and-go ready-to-use version. Keep the concentrate for room treatments, the aerosol for spot fixes.
Spray Mate 2L SprayerBattery-powered 2L sprayer for even coverage under leaves. The tool you want once you're mixing dilutions.
Insect Traps & MonitorsSticky traps catch pressure early so you know when to dilute up a preventative round.
Organic RangeRound out a clean-input program — nutrients, substrates, and amendments that match the ZT philosophy.
FAQ
What dilution rate should I use?
Start at 20ml per litre of water for young plants, seedlings, and cuttings. Step up to 30–40ml per litre for mature canopies and active infestations. Always test one leaf first — sensitive varieties show mild burn at higher strengths. If burn appears, dilute further (1 part ZT mix to 3–4 parts water).
Concentrate or aerosol — which should I buy?
Concentrate wins on value per mL of usable spray and lets you adjust strength by growth stage — best for rooms over 1m x 1m, commercial setups, or anyone rotating ZT through multiple tents. Aerosol wins on convenience for spot fixes, small tents, and quick room barrier sprays. Many growers keep both.
Can I use it during flower?
Yes. ZT is safe through flower up to around 5 days before harvest. Spray lights-off, use lighter strength (around 20–30ml/L) on dense buds, and mist rather than drench to avoid pooling in the heads. The oils evaporate fully so there's no residue or taste impact at harvest.
Does it really kill thrips and broad mites?
Yes — it's one of the few organic options with a track record for both. The key is thorough coverage (underside of leaves, inner canopy, nodes) and three applications spaced 2–3 days apart to catch eggs that hatch after round one. Single passes won't clear any mite — organic or not.
Is it safe for pets, fish, and beneficials?
Yes — a key advantage over pyrethrum, which is toxic to fish and reptiles. Keep pets out while spraying, let foliage dry, and release beneficial predators 3–4 days after your last application to avoid hitting them with residual oils.
Can I mix ZT with other foliar sprays or nutrients?
No — spray ZT on its own. Mixing with neem, soap sprays, or foliar feeds raises the risk of leaf burn and unpredictable reactions. Keep it simple and run ZT as a standalone application in your IPM rotation.
How long does it keep after opening?
Concentrate stays good for around 12 months sealed and stored in a cool, dark place. Diluted spray should be used within 24 hours — the oils lose potency once mixed with water. Mix what you need, spray what you mix.
Does it ship to Tasmania and regional Australia?
Yes — ships Australia-wide. Free shipping over $499*. Concentrate ships as standard freight (unlike the aerosol), so delivery to WA/NT/TAS is usually on the same timeline as the rest of the country. Questions on your postcode? Flick us a message.
Select Size
Dial the Strength. Scale the Room.
Organic pest control that scales from prop dome to full commercial canopy. Free shipping over $499*.