SelecTree: Tree Detail
RAINBOW SHOWER TREE
Cassia × nealiae
Photo Locations: Foster Botanical Garden - Honolulu, HI, Hilo, Maui and Kona, HI
A spectacular flowering tree and one of the most commonly planted trees on the Hawaiian Islands. A mostly fruitless, sterile hybrid of the golden shower and pink shower that blooms profusely for several months, especially during the summer. The rainbow shower tree was designated the City Tree of Honolulu in 1965. Cassia x nealiae has a HPWRA (Hawai'i Pacific Weed Risk Assessment) score of -8 (Low Risk), and the Plant Pono link is: https://plantpono.org/pono-plants/cassia-x-nealiae/.
Native to Horticultural Hybrid.
Erect, Spreading or Weeping Low or High Canopy.
Has Partly Deciduous foliage.
Height: 30 - 50 feet.
Width: 30 feet.
Growth Rate: 24 Inches per Year.
Leaves Pinnately Compound with Ovate Leaflets, Green, Golden or Yellow or Orange, Partly Deciduous.
Flowers Showy. Pink, Orange, Yellow, White. Flowers in Spring or Summer. Has perfect flowers (male and female parts in each flower).
Few, Green, Brown Legume, Medium (0.50 - 1.50 inches), fruiting in Fall.
Bark Dark to Light Gray, Rough or Smooth.
Shading Capacity Rated as Dense in Leaf.
Shading Capacity Rated as Moderate out of Leaf.
Litter Issue is Flowers, Dry Fruit and Leaves.
Tree Site Conditions & Constraints
Sunset Zones H1, H2.
USDA Hardiness Zones 10 - 11.
Exposure Full Sun.
Moist to Dry Soil.
Clay, Loam or Sand Texture.
Health, Safety & Environmental Concerns
Root Damage Potential Rated as Low.
Desirable Wildlife Plant.
Special Uses & Values
Street Tree, Shade Tree, Flowering Tree, Specimen Tree.
Cite this tree:
SelecTree. "Cassia × nealiae Tree Record." 1995-2021. Apr 17, 2021.
< https://selectree.calpoly.edu/tree-detail/cassia-×-nealiae >