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How to Grow Cassia Plants in your Garden

Gardener's HQ Guide to Growing Wild Senna and Shower Trees

Cassia can be either hardy perennial or annuals.

They generally reach an height of 60cm to 1.2m in height, and resemble small perennial trees.

They have the common names of Wild Senna, Candle bush (Cassia alata) American Senna, Golden shower tree (Cassia fistula) and Partridge tree.

Cassia have small pea shaped yellow flowers.

Cassia javanica
Cassia javanica - Pink shower tree by Tatters.

Senna Macranthera
Senna Macranthera by Mauroguanandi.

Cassia Growing and Care Guide

Common Names: Senna, Pink Cassia, Desert Cassia, Golden Shower Tree, Pink Shower tree, Sicklepod, Wild Senna, Kassod Tree, Appleblossom Shower, Sensitive Pea, Partridge pea.
Life Cycle: Hardy annual. Hardy perennial.
Height: Garden species: 24 to 300 inches (60 to 750 cm).
Native: Mainly to tropical regions, though some species are native to temperate areas.
Growing Region: Zones 6 to 11.
Flowers: Mainly summer. Some species flower in autumn/winter.
Flower Details: Yellow, pink, orange-red. Senna: Pea-like.
Foliage: Green. Compound leaves. May be evergreen.
Growing Cassia
Sow Outdoors: 1/8 inch (3mm). Summer or autumn. Spacing: Small species: 24 to 36 inches (60 to 90cm); large species (trees) 25 to 30 feet (7.5 to 9 metres).
Sow Indoors: Chip seeds. Soak in water for three hours. Germination time: one week to three months. Temperature 70 to 75°F (21 to 24°C). Seven or eight weeks before transplanting outdoors; either following the last frost or in autumn.
Requirements: Full sunlight or light shade. Good drainage. Regular watering. Regular feed. Thin plants in the autumn. Taking cuttings in spring. Divide in spring.
Family:
Closely Related Species:
Miscellaneous: Many species are now included within the Senna and Charmaecrista genera; classification of species into these genera is still ongoing. Synonymous with Carthartocarpus. Do not confuse the genus name Cassia with one of the common names for Cinnamon: Cassia; this is a member of the genus Cinnamomum.

How to Grow Wild Senna - Cassia

If planning to grow Cassia outdoors from the off it is best to sow out the seed in either Summer or autumn at a depth of 3mm. Wild Senna like species should be grown in soil that has good drainage, in either a sunny or partly shaded part of the garden. When growing Cassia indoors first then you will first need to chip the seeds, then soak in warm water for three hours before sowing. They should be planted about 7 weeks before you transplant the seedlings outdoors, in the autumn or after the last frost of the spring. When putting the seedlings out they should be spaced at about 60 to 90cm apart.

Caring for Cassia

Once established Cassia requires regular fertilisation and watering; ideally they should be thinned in the autumn.