Yes, rhubarb is poisonous to deer. The leaves of the rhubarb plant contain a compound that is toxic and harmful if ingested by deer.
Rhubarb (Rheum rhabarbarum) is a common garden plant known for its edible stalks, but its leaves pose a significant health risk to various animals, including deer, as well as humans.
Why Rhubarb is Toxic to Deer
The primary reason rhubarb leaves are poisonous is due to their high concentration of oxalic acid. This naturally occurring substance, when consumed in sufficient quantities, can lead to toxicity.
Here's a breakdown of rhubarb's parts and their toxicity:
| Part of Rhubarb | Toxicity Level | Notes |
|---|---|---|
| Leaves | Highly Toxic | Contain high levels of oxalic acid, making them dangerous for consumption. |
| Stalks | Edible | The petioles (stalks) are the only part of the plant safe for consumption. |
| Roots | Not Typically Consumed | While not commonly eaten by animals, the leaves are the primary concern for toxicity. |
When deer consume rhubarb leaves, the oxalic acid interferes with calcium absorption in their bodies and can cause kidney damage, among other health issues. This makes the plant an unattractive and harmful food source for them.
Rhubarb as a Deer-Resistant Plant
Because of the toxic nature of its leaves, rhubarb is often considered a deer-resistant plant in gardens. Deer typically avoid eating it, which can be a valuable characteristic for gardeners looking to protect their crops from browsing.
- Natural Deterrent: The inherent toxicity acts as a natural deterrent, discouraging deer from feeding on the plant.
- Protection for Other Plants: Planting rhubarb around more vulnerable garden plants might offer some level of protection, as deer are less likely to venture into areas where they encounter unpalatable or harmful vegetation.
Gardeners can utilize this characteristic to their advantage, incorporating rhubarb into their landscaping as an ornamental and functional plant that helps deter deer browsing.
