Rhubarb Leaf Tea
Quick Facts
- Type
- Toxic botanical (dangerous)
- Source
- Steeped rhubarb leaves — the leaves (not stalks) contain high concentrations of oxalic acid
- OMRI Listed
- No
- Bee Safe
- No — apply in evening
- Pet Safe
- Caution
- Residual
- Short — oxalic acid degrades in days
- Best For
- Nothing. The rhubarb stalks make excellent pie.
What Is Rhubarb Leaf Tea?
Oxalic acid in rhubarb leaves is corrosive and toxic. Causes kidney damage in mammals (calcium oxalate crystals block renal tubules). While it does kill some soft-bodied insects on contact, the concentration needed also makes it dangerous to handle.
Source: Steeped rhubarb leaves — the leaves (not stalks) contain high concentrations of oxalic acid
What Pests Does Rhubarb Leaf Tea Kill?
Rhubarb Leaf Tea is effective against the following pests:
How to Apply Rhubarb Leaf Tea
Best for: Nothing. The rhubarb stalks make excellent pie.
Avoid for: ALL pest control. Oxalic acid is a kidney toxin.
Residual activity: Short — oxalic acid degrades in days
Safety Profile
| Category | Rating |
|---|---|
| Bee Safety | 🔴 Toxic to bees while wet |
| Pet Safety | 🔴 Use caution around pets |
| Overall Rating | Warning — Organic but toxic or dangerous to non-targets |
Why Isn't Rhubarb Leaf Tea Working?
If Rhubarb Leaf Tea isn't delivering results, check these common failure modes:
Oxalic acid causes kidney damage in mammals
Dangerous to handle — corrosive to skin and eyes
Illegal to recommend as pesticide in many jurisdictions
Ineffective against anything other than soft-bodied insects