In SoCal Feverfew can be an invasive weed. Tanacetum parthenium is a perennial herb that has been used as a fever reducer and headache remedy. It has single Daisy flowers and I have to pull it from many jobs. But this is a double flowered variety that I love! It doesn't reseed all over like the common variety. And the flowers are like cute buttons. The plant grows best in full sun to about 2' tall and blooms in warm weather.