Tansy, scientifically known as Tanacetum vulgare, is a flowering perennial herb native to Europe and Asia. Historically used in folk medicine and as a natural insect repellent, tansy is recognizable for its clusters of bright yellow button-like flowers and feathery, fern-like leaves.

Characteristics

• Appearance: Tansy plants grow up to 3-4 feet tall, with erect stems and deeply divided, serrated leaves that are dark green. Its small, button-shaped yellow flowers grow in dense clusters at the top of the stems, blooming in late summer.
• Aroma: The plant has a strong, camphor-like scent, which is partly responsible for its repellent qualities.
• Toxicity: Tansy contains compounds such as thujone, which can be toxic in large amounts if ingested. Its use is generally restricted in herbal medicine due to potential toxicity, and it should be handled carefully.

Common Uses

• Insect Repellent: Tansy has traditionally been used as a natural repellent for insects, including ants, mosquitoes, and flies. Fresh or dried tansy leaves are sometimes placed around the home or garden to keep pests away.
• Traditional Medicine: In historical folk medicine, tansy was used in small amounts for various applications, but it is generally no longer recommended for internal use due to toxicity concerns.
• Ornamental: Tansy’s bright yellow flowers and attractive foliage make it a popular addition to ornamental gardens, especially in wildflower or herb gardens.

Due to the risks associated with thujone, tansy should not be ingested without proper guidance, and it’s best used externally as an insect repellent or simply grown for its beauty in gardens.