Webster's Mallee, Eucalyptus Seeds

Webster's Mallee Eucalyptus Seed

Heart-shaped silver-blue leaves distinguish this rare mallee
Compact Australian species suits smaller ornamental landscapes
Smooth gray bark complements the unusual foliage
Drought tolerance supports sunny, low-water gardens

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Key Attributes

Botanical Name

Eucalyptus websteriana

Days to maturity

135 Days (Cut Foliage)

Sun

Full Sun

Packet

20 Seeds

Zones 9–11 Check your growing zone

About Webster's Mallee, Eucalyptus Seed, Eucalyptus Seed

Websteriana Eucalyptus, commonly called Webster's Malle or Heart-leaf Eucalyptus, is a rare, small Australian species valued for its distinctive silvery-blue, heart-shaped juvenile leaves and smooth, gray bark. Native to Western Australia, it typically grows 6–12 feet tall, making it well-suited for smaller landscapes, windbreaks, or ornamental plantings. Seeds should be sown in well-drained soil in full sun, either in pots or directly outdoors in warm climates, and kept moist until germination, which usually occurs in 14–30 days.

Growing details

Planting

Sow Depth

1/16"

Days to Germination

7–21 days

Germination Type

P - Sow Under Cover

In-row plant spacing

3-6'

Plant profile

Life Cycle

Tender Perennial

Hardiness Zone

Zones 9-11

Plant Height

48 inches (cut foliage)

Growth Habits

Upright

Seed & variety

Seeds Per Ounce

54,518

Color

Green

Seed Type

Open Pollinated

Before Planting

Eucalyptus grows best in a full-sun site with well-drained soil and good air circulation. Remove perennial weeds, loosen compacted ground, and incorporate modest compost without making the bed overly rich. Prepare a fine, firm seedbed. Plan to sow under protected indoor or greenhouse conditions.

Planting

Start eucalyptus indoors 8–10 weeks before the last frost, surface-sowing or barely covering the seed as directed for the species. Maintain warmth, bright light, and airflow, then harden seedlings gradually. For annual foliage production, space eucalyptus 12–24 inches apart; trees intended for the landscape require spacing based on their mature size.

Watering

Water eucalyptus regularly until established, then irrigate deeply only when the soil becomes dry. Avoid frequent shallow watering and saturated conditions, which encourage weak growth or root disease.

Fertilizer

Apply fertilizer to eucalyptus only as needed, choosing a light balanced or bloom product once plants are rooted. Repeated feeding is unnecessary in fertile soil and may reduce flower production.

Harvesting

Cut eucalyptus flowers when blooms are well colored and at the opening stage best suited to display. Harvest during the cool morning with clean shears, leaving healthy foliage for continued flowering.

Tips

Stake tall eucalyptus plants before stems lean, using loose ties that allow growth. Pinch branching types when young, deadhead regularly, and leave selected seed heads for wildlife if desired.

Pests & Diseases

Seedlings face damping-off; older eucalyptus may develop anthracnose, Botryosphaeria dieback, cankers, crown gall, or Phytophthora root rot. Prune dieback back to sound tissue in dry weather and disinfect tools. Avoid root injury and saturated containers, and never propagate from branches showing cankers or galls.

The main pests to watch on eucalyptus are aphids, thrips, spider mites, Japanese beetles, slugs, and caterpillars. Focus scouting on fresh growth and flower buds, removing pests manually whenever practical.