Castor aralia is the aralia family's only large tree, a deciduous giant that reaches 40 to 60 feet tall with an elegant upright oval form. Native to cool, moist forest regions where it can tower 90 to 100 feet, this species brings bold architectural presence to temperate gardens in zones 4 through 7. Its massive palmate leaves, 7 to 14 inches wide with five to seven lobes and a glossy dark green finish, echo the form of castor bean plants, creating a lush, tropical effect despite its cold hardiness. Showy clusters of small white flowers arrive in July and August, followed by equally ornamental dark fruits that extend the visual interest well into the season.
Full Sun
Moderate
4-7
720in H x 720in W
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Low
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Large palmate leaves with a glossy dark green finish create a striking tropical silhouette in the temperate landscape, turning shades of dull yellow to red in autumn. The tree's clean upright habit and moderate size make it an excellent choice for specimens or shade without overwhelming residential properties. Showy summer flowers and attractive dark fruits offer two seasons of ornamental interest, while the tree asks very little in return, demanding only decent soil and moderate water.
Castor aralia thrives as a specimen flowering tree where its bold foliage and neat branching structure command attention, or as a shade tree that casts dappled light without excessive density. Its ornamental flowers and fruit make it equally valuable for visual impact as for practical cooling and shelter.
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