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As the name implies, feathery cassia is a soft textured evergreen shrub growing 3-6 ft. tall and as wide. Foliage is comprised of finely divided gray-green leaves; intense yellow flowers cover the plant in mid winter to early spring for a striking floral display.

Native to Australia, feathery cassia is widely planted as a flowering accent shrub in drought tolerant and southwestern style gardens. It is adapted across the Inland Empire and grows best in sunny locations on well drained soils and with low amounts of summer water. It tolerates cold to 20°F and can be clipped to maintain smaller sizes in residential gardens.

Water Needs

Feathery cassia is well adapted to sunny locations on well drained soils and with low amounts of supplemental water during summer. The chart shown below provides a recommended baseline guide to the monthly irrigation schedule and volume of supplemental water needed to maintain healthy growth throughout the average year. As shown in the chart below, there are several months indicated by an asterisk (*) when winter rains can provide sufficient moisture and irrigation is not needed. The high and low range of moisture indicates it can grow with varying amounts of water. Once established, feathery cassia grows well on monthly deep water from July to October.

Irrigation Schedule and Graph

Low Water Use Plants

Irrigation Schedule 1

  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
Runs per Month 0x to 2x 0x to 2x 0x to 2x 1x 1x 1x 1x 1x 1x 1x 0x to 2x 0x to 2x
Inches per Run 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1"
Inches per Month 0" to 2" 0" to 2" 0" to 2" 1" 1" 1" 1" 1" 1" 1" 0" to 2" 0" to 2"

Range of supplemental summer water: 7"
Range of supplemental winter water: 0"-10"

  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
For more information on how to use this Irrigation Schedule and Graph, follow this link.

For information how to calculate your irrigation system’s schedule and precipitation rate, please follow this link.

Plant Properties

Plant Type: Shrub
Foliage Character: Evergreen
Habit: Mounding
Growth Rate: Fast
Height: 3 ft. - 6 ft.
Width: 3 ft. - 6 ft.
Water Needs: Low 1
Foliage Color: Pale green
Flower Color: Yellow
Flower Season: Winter, Spring
Soil Adaptations: Well-draining soil, Rocky soil
Exposure Adaptations: Wind, Heat, Frost, Drought, Aridity, All day sun
Function: Wildlife value, Residential spaces, Raised planters, Parks and open space, Grouped, Foundations, Flowering accent plant, Commercial spaces, Borders, Banks, Background plant, Attracts bees, Attracts butterflies


Very fast growing. Cut back as necessary to encourage more compact form (5). This can easily be accomplished by light pruning after winter and spring flowering (5). If flowers are left to develop seed pods, seeds may germinate and grow. Although it is not widely considered an invasive plant, because of this tendency, it is best not to plant this plant if your landscape is near a wild area (S).



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