Rhododendron: poisonous or not?

Are rhododendrons poisonous to humans? And what about the danger to pets like cats and dogs? We clarify.

Rhododendrons (rhododendron) are popular evergreen shrubs that can be found in many gardens and parks. But just because the rhododendron can be found everywhere does not mean it is harmless. Because certain ingredients that the plant use as natural protection against eating should also be kept away from humans and pets.

Is rhododendron poisonous?

The flowers, leaves and fruits, but also in smaller quantities the other parts of the plant, contain poisonous diterpenes. Skin irritation can already occur upon contact with the plant. Therefore, gloves should always be worn when caring for and planting a rhododendron. The following symptoms of poisoning can already occur when consuming a leaf or a flower:

• Nausea
• diarrhea
• stomach pain
• nausea
• Hypersensitivity of mucous membranes and extremities
• Increased salivation

These arise from the fact that certain channels are blocked at the cellular level, whereby the stimulus reproduction between the Cells of the gastrointestinal tract, the heart, the skeletal muscles or the nervous system no longer functions. In an emergency, this can lead to breathing disorders, seizures, severe cardiac arrhythmias, symptoms of paralysis or even death. If the symptoms are more severe, a doctor should be consulted at the latest. If the symptoms are mild, it is sufficient to drink plenty of fluids. Compared to other ornamental plants, the rhododendron is not considered particularly poisonous. Planting is therefore only advisable if there are small children in the household.

The nectar also contains certain diterpenes - the gayanotoxins. As a result, the honey in some regions such as the Turkish Black Sea coast contains small amounts of the toxin. This pontic honey or mad honey can cause symptoms of poisoning such as nausea, vomiting and hallucinations.

Rhododendron poisonous for cats, dogs & Co.?

There are also many dangers lurking in the garden for the four-legged friend at home. The toxins are also poisonous for pets such as dogs and cats, horses, cattle and tortoises. The same symptoms occur as in humans, only that these occur more intensely and from a lower amount. If you recognize one of these symptoms of poisoning, it is therefore advisable to consult a veterinarian.