Previously included in Cassia and still often sold as such, these species have been reclassified as Senna—a move not accepted by all botanists. Grown for their lavish show of bright yellow, five-petaled flowers that look something like those of potentilla. Blossoms are followed by seedpods that may create litter; to reduce pod production, prune lightly after flowering. Rangy, rank growers should also be cut back periodically to encourage more compact growth. Good for screens, massing, background plantings. Prefer well-drained soil.Senna nemophila
FromCalifornia. Erect or sprawlingto 2–3 ft. high and 3 ft. wide.Ovate green leaves to 13/4 in.long. Purple, 1-in. flowers inlate winter, spring. Superiorforms include ‘Mountain Pride’and ‘Salmon Creek’. Little orno water.
From Taiwan. To 15–30 ft. high and wide, with drooping branchlets and glossy green, oval, 2&ndash
Open, graceful habit to 8 ft. tall, 12 ft. wide. Narrow, bright green, 1-in. leaves are dark green abo...
Native to Africa. Slow grower 20 to 30 ft. tall, 20 to 35 ft. wide. Open, spreading habit; graceful, w...