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Red Cap Gum, Illyarrie, Bookara Gum
Scientific Name: Eucalyptus erythrocorys F. Muell.
Family: Myrtaceae
Red Cap Gum, Illyarrie, Bookara Gum (Eucalyptus  erythrocorys)
Juvenile growth at the Australian Outback Native Plant Nursery
Recommended Temperature Zone:
sunset: 5,6,8-24
USDA: 9-10

Frost Tolerance: Hardy in Phoenix, hardy to 23-26F (-5 to -3C)

Sun Exposure: Full sun

Origin: Western Australia

Growth Habits: Small tree with multiple trunks, quick growing to 30 feet tall (9 m), 20 feet wide (6 m), dense foliage; adult leaves are alternate, flaky bark; shiny green, long, lance shaped, up to 10 inches long (25 cm), 0.8 to 1.6 inch wide (2-4 cm), often sickle-shaped, with a red petiole; juvenile leaves are opposite, and much shorter, wider, and hairy

Watering Needs: Occasional deep watering


Attractive bright red caps pop open to bright yellow flower clusters in mid-summer.

Blooming Habits:
Bright yellow, exceptionally wide flowers in summer. The unopened bud has a bright red cap.

Fruiting Habits:

Australian Outback Native Plant Nursery

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Desert-Tropicals is dedicated to provide gardening advice, gardening ideas, and information about flower of all kind for landscape and collections. We try to check carefully the identification of the plants on the illustrations as well as the other information from the page, but occasionally errors do occur. if you notice anything that needs to be changed please contact us. Thanks.

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