Dalmatian pellitory - Tanacetum cinerariifolium also known as Chrysanthemum cinerariaefolium. The dried flowers of Pyrethrum are used as an insecticide and fumigant. The flower buds are picked when they are in full bloom this is when they have the highest pyrethrin content. A good insect repellent for the garden. Grow in well drained soil in full sun. Sow seeds spring onwards. Perennial