Rudbeckia (Gloriosa Daisy) rood-BECK-ee-uh
Rudbeckia are perennial flowering plants that are hardy in Zones 4–9. Like many plants, they have several common names, among which are: Black-eyed Susan, Gloriosa Daisy and Yellow Ox Eye. They are members of the Asteraceae family and are native to both damp woodlands and dry prairies in North America. Rudbeckia have a clumping, but upright habit and coarse texture. Black-eyed Susans will average 2–3 feet in height and about 1–2 feet in clump width. However, colonies of Black-eyed Susans can become quite large. Proper spacing between plants will increase air circulation between the plants to keep leaves dry and help prevent the spread of diseases.