Tanacetum vulgare, or Tansy is a herbaceous, perennial with finely divided, fern-like, compound foliage and Terminal clusters of yellow flowers that look like clusters of small buttons on erect stems.
The flowers have a distinctive fragrance that combines camphor and rosemary - however beware that both flowers and leaves can be toxic if consumed in larger quantities.
It has been used as a medicinal plant for millennia, especially to treat intestinal worms, rheumatism and digestive problems. In the middle ages it was also used to induce abortions.
Tansy repels moths, flies and ants.
Plant beneath fruit trees to repel harmful flying insects and alongside potatoes as a companion plant to keep Colorado beetle at bay. Also good when planted with any curcurbits like squash or cucumbers and even amongst roses to keep bugs away.
Tansy leaves also assist in compost fermentation.