How to Propagate Australian mountain ash?
Propagate by seed at 13-18°C in spring and summer

Australian mountain ash · Eucalyptus regnans
Also known as: Australian mountain oak; giant gum
Grows best in full sun and a mildly acidic, neutral, or mildly alkaline soil that is moist but well-drained. Able to withstand cold temperatures when mature, but shelter from cold, drying winds especially when young. See eucalyptus cultivation
Propagate by seed at 13-18°C in spring and summer