Eucalyptus globulus, commonly known as Tasmanian Blue Gum, is a fast-growing evergreen tree native to southeastern Australia. This is the world's most extensively planted eucalyptus species and is valued for timber, eucalyptus oil production (rich in cineole), and medicinal applications. Seeds have light requirements for germination and respond well to cold stratification, typically germinating rapidly at warm temperatures following the cold treatment.
Before sowing
Cold stratification is optional but improves germination consistency. Seeds should be stratified in the refrigerator for 4-6 weeks on moist (not waterlogged) substrate at 5°C. Alternatively, seed can germinate without stratification at warm temperatures (75°F/24°C or higher) after 3-4 weeks, though stratification provides more reliable results.
Sowing
What to expect
Tips
Surface sow seeds on moist substrate without burying; they require light for germination. Maintain substrate moisture but avoid waterlogging. Germination occurs in 7-28 days at 20-28°C; optimal temperature is 24-25°C where 96% germination rate is achieved within 21 days. Keep seed container in bright light (avoid direct sunlight for young seedlings). Seeds prefer humid conditions (95-100% humidity during first 9 days); reduce to 40-60% thereafter. Thin or transplant seedlings to individual pots once second set of seed leaves appear. Do not allow seedlings to dry excessively in pots, as they are drought-sensitive when young. If germination stalls after initial sowing at warm temperatures, apply cold stratification for 2-4 weeks to break dormancy. Provide bright light and good ventilation post-germination to prevent damping-off.
Sources: Benary seed production data; Sheffield's Seed Company; PFAF database; Research papers on Eucalyptus globulus germination physiology; Australian Wildflower Seeds; UF/IFAS propagation database
