These seeds were collected from Romneya coulteri, also known as Coulters Matilija Poppy, and California Tree Poppy. This shrub likes to live in full sun where it can grow to about 6 feet high. The very large white blossoms with yellow centers are on display from late spring until early fall where they attract many different birds, bees, and butterflies. USDA Hardiness Zones 7 to 11.