100 (140)cm, Mexican Butterfly Milkweed is a fast growing annual to perennial native of Central and Northern South America and makes bright orange and red flowers in terminal clusters. It is an important host plant for the Monarch butterfly (Danaus plexippus) and easily grown in any rich, well drained soil in full sun. In colder climates plants will die back to the ground in winter, but may sometimes resprout from the rhizome in late spring. Alternatively plants can be grown as annuals from seeds sowed in late spring under glass. Transplant seedlings to the final spot in the garden after the last freezing nights. VI-IX.