Eucalyptus gunnii
f. Hook
Ecualyptus gunnii
"
One of the hardiest species of Eucalyptus. Its wood, nectar, menthol-scented oil and gorgeous glaucous foliage have numerous economical and commonplace uses.
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Family |
Myrtacaeae |
Genus |
Eucalyptus |
Species |
gunnii |
Category |
Woody |
Type |
Tree (evergreen) |
Forma |
Hook |
USDA Hardiness Zone |
7b - 11a |
Canadian Hardiness Zone |
7b |
RHS Hardiness Zone |
H5 - H1c |
Temperature (°C) |
(-12) - 7 |
Temperature (°F) |
10 - 45 |
Height |
25-30 m (if not pruned) |
Spread |
10 m |
General Description |
A fast growing, medium sized evergreen tree or large shrub. Visually appealing peeling bark, rich menthol scented foliage and clusters of white flowers. |
Landscape |
A cold hardy evergreen quickly growing in popularity, is commonly used as an ornamental tree/specimen. Often planted as an accent plant/shrub or maintained as a patio tree. |
Cultivation |
Well-drained, neutral to slightly acidic soil with full sun. Drought tolerate once established. A shallow-rooting plant, thus does not favour any root disturbance. |
Shape |
Medium-sized, columnar and upright when left to grow without maintenance or pruning. |
Growth |
Fast |
ID Characteristic |
Easily identified by its peeling grey to cream coloured bark, rounded and brightly coloured glaucous juvenile foliage. Unmistakably strong menthol-scented oils emitted from the foliar oil glands and its white inflorescence flower clusters that resemble 'pom poms'. |
Pests |
Eucalyptus gall wasps attack during the spring and can cause a large amount of leaf loss, leaving the plant vulnerable. Susceptible to honey fungus and leaf beetle. |
Habitat |
High elevations in Tasmania, South Wales, and Victoria, Australia, and alpine regions such as Tasmania's central plateau at an elevation of 1,000 - 1,200 m above sea level. |
Bark/Stem Description |
Beautiful and distinctive bark, smooth to the touch and varies in colour from grey-green to cream occasionally brown with a spots of pink. The bark peels off in large pieces, revealing new bark underneath which can vary from a yellow-green to light grey in colour. |
Flower/Leaf Bud Description |
Eucalyptus buds form in clusters on single stalks. The individual bud consists of a bell shaped capsule called an operculum and a cap on top called a calyptra that is shaped like a 'Hershey Kiss'. The operculum is made up of fused petals, sepals, or both. |
Leaf Description |
Juvenile foliage is oppositely arranged, with a cordate blade, entire leaf margin and obtuse apice, a silver-blue in colour. Mature foliage is very waxy in appearance and dark green. Both juvenile and mature foliage is covered in oil glands which secrete a scent similar to menthol. |
Flower Description |
The flowers are arranged as an umbel inflorescence in clusters of 2 or 3, very much resembling pom-poms. They are white in colour and a very abundant source of nectar for bees. |
Fruit Description |
The fruit consists of a bell shaped capsule called an operculum. It varies in colour from green to grey-blue. It is approximately 10 mm long and 5 mm wide. |
Colour Description |
Its peeling bark ranges from a dark grey-green to creamy white. The new bark is often creamy-white to yellow-green. Juvenile foliage is glaucous, showing and eye-capturing silvery, green-blue colour. Mature foliage is dark green with hints of greys and blues. Seed capsules are light to dark brown and flowers are white in bloom. |
Texture Description |
Generally a smooth textured plant. |
Notable Specimens |
The Royal Botanical Gardens, Edinburgh, Scotland. |
Propagation |
Propagate by seed. Seeds require a moist and cold stratification (35 -40°F) for a period of 6-8 weeks prior to planting. Use light, non-compacting and neutral pH soil. The seed should germinate within a few weeks. Eucalyptus cuttings are difficult to root, therefore is not the favoured method of propagation. |