Poisonous Plants: 31 Common Garden Species That Can Cause Harm

Many familiar garden plants have compounds that can hurt people or animals if touched or eaten. This guide lists 31 such species, explains how often serious outcomes occur, and offers a framework to decide whether to grow them.

Kids and pets are the primary concern. They put things in their mouths and have smaller bodies, so lower doses can matter. Livestock are also vulnerable because grazing animals aren't selective and yew poisoning in livestock is notably more common than in companion animals. If you have toddlers, curious dogs, or grazing animals, skip or fence out plants with highly toxic parts (for example, red berries or attractive seed pods).

Make choices based on exposure risk

Not every poisonous plant must be removed. Many listed plants have ornamental value or medicinal uses when handled correctly. Decide which species to avoid by asking: Will unsupervised children or pets reach it? Does the plant produce tempting fruit or colorful berries? Can livestock access it? For picky adult pets or gardeners who supervise children closely, some traditionally labeled "extremely poisonous" plants may be acceptable in the landscape.

• Aconite (monkshood/wolfsbane): contains aconitine, which can cause numbness, muscle weakness, and cardiac effects.
• Aloe: widely used for human topical care, but can be toxic to dogs and cats if ingested.
• Castor bean: seeds contain potent toxins.
• Datura / Jimson weed and Angel's trumpet: contain tropane alkaloids that affect the nervous system.
• Foxglove: source of cardiac glycosides used medicinally but dangerous if misused.
• Lily (some species) and Lily of the Valley: problematic, especially for pets or children in certain cases.
• Oleander, yew, rhododendron, and azalea: known for potentially severe cardiotoxic or systemic effects.

• Supervise young children and pets in garden areas where hazardous plants grow.
• Remove or fence plants that produce attractive berries, pods, or brightly colored parts if kids or curious animals are present.
• Educate household members about which plants are risky and what the symptoms of poisoning can look like (gastrointestinal upset, drooling, weakness, unusual behavior, breathing changes, or cardiac symptoms).

If you find a child or pet has chewed or eaten part of a plant on the list and you see symptoms such as vomiting, diarrhea, excessive drooling, muscle weakness, altered consciousness, or breathing issues, call Poison Control or emergency services. If there's no symptom and the exposure was minor, Poison Control can advise whether home observation is sufficient.

This list is a reference for potential risks, not an instruction to avoid all named species. Balance the toxicity potential against who uses your yard, how likely exposure is, and whether supervision or physical barriers can reduce risk.