Eucalyptus gunnii aka Apple Eucalyptus

Eucalyptus gunnii, or cider gum, is an evergreen tree from Tasmania. It belongs to the myrtle family, Myrtaceae. Other names include cider tree and Tasmanian cider tree. In the wild, it grows in alpine areas on rocky ground. It also occurs on marshy soils. Its upright, columnar form gives it a strong outline in gardens.

The RHS lists heights above 39 feet [12 metres]. Its spread can exceed 26 feet [8 metres]. These figures are thresholds, not fixed limits on mature size. Trees reach maturity in about 10–20 years. Cream and brown bark peels from the trunk. Young leaves are rounded, with a bright, waxy blue surface. Adult leaves turn grey-green and become elliptic or sickle-shaped. Small groups of white flowers add another feature to the tree. Pruning can help retain the young foliage prized for its colour.

Grow this tree in full sun, with shelter while young. Slightly acid soil suits it, though the RHS also lists neutral soil. It accepts clay, loam, sand and chalk soils. The RHS lists both well-drained and poorly drained growing conditions. Moist soil suits it, including ground that drains well. Its UK hardiness rating is H5, covering lows around 5–14°F [−15 to −10°C]. PFAF lists USDA zones 7–10. Seeds can be sown in spring or summer at 55–64°F [13–18°C].

The tree can serve as a bold feature in planting schemes. The RHS also lists it for patios and containers. Its mature size still matters when choosing a site. Plants grown under glass may need pruning to limit their size. PFAF lists woodland canopy and bog garden uses. Trees can be coppiced for fuel, with wood dried for at least twelve months. The leaves yield an essential oil containing substances with antifungal action.

PFAF records sweet sap and manna as edible products. Sap can be drawn through wounds in the bark in spring. Reports describe drinking it fresh or fermenting it into cider. These uses do not establish that other parts are edible. Watch for eucalyptus gall wasp and eucalyptus sucker. Possible diseases include silver leaf and honey fungus. The RHS also lists oedema as a potential problem.