Neem Oil
Quick Facts
- Type
- Botanical
- Source
- Cold-pressed oil from seeds of the neem tree (Azadirachta indica)
- OMRI Listed
- Yes ✓
- Bee Safe
- No — apply in evening
- Pet Safe
- Yes
- Residual
- 3-7 days; breaks down rapidly in UV and rain
- Best For
- Multi-pest situations on vegetables and ornamentals. Unique IGR action prevents immature insects from developing.
What Is Neem Oil?
Contains azadirachtin, which disrupts insect hormone systems (ecdysone), preventing molting, feeding, and reproduction. Also works as a physical suffocant and antifeedant. Dual modes: cold-pressed neem works as both IGR and contact killer; clarified hydrophobic neem extract works primarily as suffocant.
Source: Cold-pressed oil from seeds of the neem tree (Azadirachta indica)
What Pests Does Neem Oil Kill?
Neem Oil is effective against the following pests:
How to Apply Neem Oil
Best for: Multi-pest situations on vegetables and ornamentals. Unique IGR action prevents immature insects from developing.
Avoid for: Blooming plants during pollinator hours. Heat-stressed plants. Do not apply above 90°F.
Residual activity: 3-7 days; breaks down rapidly in UV and rain
Safety Profile
| Category | Rating |
|---|---|
| Bee Safety | 🔴 Toxic to bees while wet |
| Pet Safety | 🟢 Safe for pets |
| Overall Rating | Caution — Use with caution — timing and technique matter |
Why Isn't Neem Oil Working?
If Neem Oil isn't delivering results, check these common failure modes:
Temperature too high — never apply above 90°F, causes phytotoxicity
Insufficient emulsification — oil separates without proper mixing
Wrong product — clarified neem lacks azadirachtin; cold-pressed retains it
Applied in direct sunlight — burns leaves when oil heats up
DIY Neem Oil Recipe
Mix 2 tablespoons cold-pressed neem oil + 1 teaspoon liquid castile soap per gallon of warm water. Shake vigorously before and during spraying. Apply in evening.
Best Neem Oil Products
Organic Neem Bliss
Cold-pressed oil100% cold-pressed — retains full azadirachtin content
Garden Safe Neem Oil Extract
Clarified extractHydrophobic extract — primarily works as suffocant
Bonide Neem Oil
RTU SprayReady-to-use for convenience