Pyrethrum

Pyrethrum, common name Painted Daisy, is used in the garden as an ornamental perennial.  But the flowers also are made into a very strong insecticide.  The stems and leaves can also be used, but the center of the flower is the most powerful part of the plant.  The plant parts should be dried and ground into powder to make insecticide.  Pyrethrum can be interplanted with vegetables in the garden because it is a very effective insect repellent as well.  The live plant is not toxic to insects.  My pyrethrum is growing in partial shade, so I don't get many flowers.  The other useful plant in the Tanacetum family is Feverfew.  Feverfew is very effective treating migraine headaches and menstrual pain.