Desert Cassia

Binomial name

Senna polyphylla

Common names

Small-leaf Senna, Desert Senna

Description

Small-leaf Senna is a drought-tolerant, low-growing shrub that brings a splash of sunshine to arid landscapes. It features small, bright yellow flowers that bloom in clusters, creating a cheerful contrast against its silvery-green, finely divided leaves. This plant is perfect for xeriscaping, rock gardens, or as a colorful addition to garden beds where water conservation is a priority. It's a hardy, resilient plant that thrives in hot, dry conditions, making it an excellent choice for low-maintenance landscaping.

Light requirements

Senna polyphylla thrives in full sun. It loves bright, direct sunlight and will bloom best when it gets plenty of exposure throughout the day. While it can tolerate some light shade, the plant’s growth and flowering will be more robust in sunnier spots.

Soil preferences, including pH and drainage

This plant does best in well-draining, sandy or loamy soil with a slightly acidic to neutral pH (6.0–7.0). It is particularly well-suited to dry, rocky soil and thrives in poor conditions where many other plants would struggle. As with most drought-tolerant plants, good drainage is essential to prevent root rot.

Water needs

Senna polyphylla is highly drought-tolerant once established and requires very little water. Water it occasionally during prolonged dry spells, but allow the soil to dry out completely between waterings. Overwatering can lead to root rot, so it's best to err on the side of dryness.