These seeds were collected from Callistemon rigidus, also known as Red Cluster Bottlebrush Tree, and Clemson Hardy. These trees like to live in full sun where they can grow to about 20 feet high. The red blossoms are on display from late winter until early summer where they attract a wide variety of birds, bees, and butterflies but are deer resistant. USDA Hardiness Zones 7 to 11.