Winter cassia shrub with arching branches and abundant golden-yellow flowers beside a block wall

Winter Cassia

Senna bicapsularis
Categories:
Shrubs  ·  
Desert Shrubs
Light
Full sun
Water
Moderate water for best growth and flowering. Water deeply, then allow the upper soil to dry; irrigate more often during extreme summer heat and less in winter.
Size
6-10 ft tall × 6-8 ft wide
Habit
Mounded – spreading shrub
Toxicity
Toxic — Pets
Description
A fast-growing, subtropical shrub with arching branches, rounded leaflets, and abundant golden-yellow flowers during Phoenix’s cooler months.
Bloom Time
Fall to winter
Deciduous / Evergreen
Semi-evergreen
Special Features
Attracts Bees / Pollinators, Attracts Butterflies, Showy Flowers
Growth Rate
Fast
Growth Habit
Mounded – spreading shrub
Mature Size
6-10 ft tall × 6-8 ft wide
Flower Color
Yellow
Foliage Color
Medium green
Landscape Use
Border / Bed, Container / Patio, Hedge / Screen, Pollinator / Wildlife Garden, Specimen / Accent
Garden Style
Hedge / Formal, Pollinator / Wildlife
Soil
Alkaline Tolerant, Sandy / Rocky, Well-Drained
Companion Plants
'Little John' bottlebrush, Autumn sage, Deer grass, Desert marigold, Red yucca
Toxic — Pets
Seeds/pods toxic if ingested (cathartic)
Care Instructions

Light: Full sun to light shade; afternoon shade is beneficial in Phoenix, especially near heat-reflecting walls.

Water: Moderate water for best growth and flowering. Water deeply, then allow the upper soil to dry; irrigate more often during extreme summer heat and less in winter.

Soil: Well-drained soil; tolerates sandy or loamy soils and some alkalinity. Avoid persistently wet soil.

Mature size: Typically 8–12 feet tall and 6–10 feet wide; frost and pruning may keep it smaller.

Bloom: Primarily fall into early winter; flowering may continue longer during mild, frost-free weather.

Evergreen / deciduous: Evergreen in frost-free conditions; semi-evergreen or deciduous during colder Phoenix winters.

Growth rate: Fast with adequate warmth and irrigation.