Privet Cassia (Senna ligustrina) is an evergreen perennial shrub that may grow approximately 3-8 feet high and up to 4-6 feet wide. It prefers full sun with slightly moist to very dry soil. It blooms clusters of beautiful yellow flowers that the pollinators love in fall through spring months and sometimes even summer months. A nice ornamental to add to your butterfly garden. Privet Cassia is the larval host plant for the Cloudless Sulphur, Sleepy Orange and Orange-barred Sulphur butterflies.