Tansy

A tansy plant

Tansy (Tanacetum vulgare) is a perennial herb with fern-like leaves and yellow button flowers. It has numerous medicinal properties, but should be used with caution as excess may cause abortion, venous congestion of abdominal organs and convulsions.

Aside from any culinary uses it may have, tansy has bright yellow flowers which are supposed to make a good yellow dye stuff. (see Dyeing)

This is a fantastic herb to grow is you want lots of coverage, as they will tend to grow everywhere. Unfortunately this makes it a noxious weed in some areas.

Tansy can also refer to the entire genus Tanacetum, which includes plants such as pyrethrum, alecost, feverfew and members of the daisy family.