Tasmanian Blue Gum (Eucalyptus globulus)

Tasmanian Blue Gum

Eucalyptus globulus

A towering evergreen tree renowned for its aromatic, blue-green foliage and peeling bark. Other names: Southern blue gum.

Requires full sun for optimal growth and foliage development.
1/week
Easy
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Plant Needs

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Sunlight Requires full sun for optimal growth and foliage development.
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Watering Drought-tolerant once established; requires moderate watering when young.
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Temperature Prefers mild to warm climates; mature trees can tolerate light frosts but are sensitive to hard freezes.
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Characteristics

  • Leaves: Juvenile leaves are broad, glaucous (blue-grey), and opposite; adult leaves are sickle-shaped, dark green, glossy, and alternate;
  • Flowers: Solitary, axillary, with a warty, woody receptacle and numerous creamy-white stamens, lacking distinct petals;
  • Bark: Smooth, shedding in long ribbons, leaving a mottled grey, white, and bluish surface, with rough, persistent bark at the base.
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Care Guide

Watering

Water deeply once a week for young trees; established trees rely mostly on rainfall.

Fertilization

Apply a balanced organic mulch or light fertilizer at the base.. Eucalyptus generally requires little to no supplemental fertilization once established in the landscape.

Coffee Grounds Application:Sprinkle a thin layer of used coffee grounds around the drip line of young trees and water in well. This provides a gentle nitrogen boost and slight acidity. Avoid thick layers to prevent mold and ensure proper soil aeration.
Pruning
  • Prune young trees to establish a strong central leader and structural framework;
  • Remove dead, diseased, or crossing branches during the dormant season;
  • Can be coppiced (cut back to the stump) to control size and encourage bushy juvenile foliage;
  • Avoid heavy pruning of mature trees unless necessary for safety, as they can drop large limbs.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Toxic to cats per ASPCA. Ingestion of leaves or oils can cause gastrointestinal and neurological issues.

Humans: Essential oils can cause nausea, vomiting, and dizziness if ingested in large amounts.

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Garden Uses & Culture

Culture: Introduced to Europe and the Americas in the 19th century, it became a symbol of rapid growth and was widely planted in California and the Mediterranean for timber, windbreaks, and marsh drainage.

Usage: Timber, paper pulp production, essential oil extraction (eucalyptol), ornamental landscaping, and windbreaks.