Quercus frainetto aka Hungarian Oak

Quercus frainetto is known as Hungarian oak or Italian oak. This leaf-shedding tree belongs to the beech family, Fagaceae. Its native range includes central and southern Italy and the Balkans. It extends to northwest Romania, Lesvos, and northwest Turkey. Garden trees reach 50–80 feet [15–24 metres] tall. Their crowns spread 40–70 feet [12–21 metres] wide. RHS gives an eventual height of 98 feet [30 metres]. Wild trees can reach 125 feet [38 metres].

Young trees have an upright shape and an oval crown. The crown becomes rounder and spreads with age. Smooth gray bark turns brown and develops deep cracks. Young twigs bear small, rust-colored hairs. The leaves grow in an alternate pattern along the shoots. Each simple leaf has deep, rounded lobes. Leaves measure about 0.5–0.8 feet [0.15–0.25 metres] long. Their upper sides are dark green, with paler, hairy undersides. Fall leaves turn yellow-brown or russet before they drop.

Small greenish flowers appear in spring, in hanging catkins. Each tree bears separate male and female flowers. Light brown acorns grow in groups of two to five. Hairy, scaly cups cover at least one-third of each nut. The acorns ripen in fall, about six months after flowering. Birds and small mammals come to feed on them. The tree also draws butterflies and provides wildlife shelter.

This oak grows in full sun or partial shade. It needs deep, fertile soil that drains well. Clay, loam, and sand can all support it. NC State favors acid soil; RHS also lists neutral and alkaline soils. Moist soil suits it, but established trees can withstand dry conditions. NC State lists USDA zones 6a–8a; Oregon State reports hardiness to 5b. RHS rates it H6 for UK conditions. Growth estimates range from moderate at NC State to fast at RHS. Full size can take more than 50 years. Its broad crown suits parks, large lawns, and spacious gardens.

Pests include borers, scales, aphids, caterpillars, and leaf-mining moths. Oak gall wasps and oak processionary moth may also attack. Diseases include leaf spot, powdery mildew, honey fungus, and root rot. Acorns need leaching or boiling to remove tannins before eating. Untreated fruit can cause gut pain and other poisoning symptoms. Acorns can also block the gut; dogs and horses face risks. PFAF records food uses for processed seeds, including flour and thickening. It also records astringent uses for galls and tannin from bark. Acorn cups have served as buttons.