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An oak apple on a tree in Worcestershire, England. An oak apple or oak gall is a large, round, vaguely apple-like gall commonly found on many species of oak. Oak apples range in size from 2 to 4 centimetres (1 to 2 in) in diameter and are caused by chemicals injected by the larva of certain kinds of gall wasp in the family Cynipidae. [1]
The tree is deciduous, upright and vase shaped, [2] growing up to 8 to 6 metres (26 to 20 feet). It is cold hardy to UK zone 4 and the United States Department of Agriculture's zones 4–8, and is not frost tender. It blossoms in June, and the seeds ripen from October to November. [3] Flowers appear in corymbs. [2]
Its green leaves resemble oak leaves, hence the name quercifolia. It can assume both a prostrate and an upright bushy habit, with bushier forms reaching up to 3 ft. in height. It produces green seed capsules armed with long sharp spines, which, like those of some Datura species, open by four equal valves. The funnel-shaped flowers are white and ...
The gall itself is a typical oak apple gall in appearance, roughly spherical and varies from greenish to reddish or orange depending on host, age and environmental conditions. The galls range in size from a 2–14 cm across and often contain multiple larvae as well as parasites and other species that form a mutual relationship by feeding off ...
An open-centred crown on a short trunk of less than 1 metre (3 ft 3 in). This is a traditional and popular form for apple trees. Bush trees are easy to maintain and bear fruit at a young age. Final height is between 2 metres (6 ft 7 in) and 5.5 metres (18 ft), depending on which rootstock is used. [1]
When Not to Prune Apple Trees. There are several reasons not to prune an apple tree. One is if the tree is very young, especially if it's grown from seed, as it won't have a well-established root ...
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The wild apple is a deciduous small to medium-sized tree, but can also grow into a multi-stemmed bush. It can live 80–100 years and grow up to 14 metres (46 feet) tall with trunk diameters of usually 23–45 centimetres (9– 17 + 1 ⁄ 2 inches), although diameters exceeding 90 cm (35 in) have been recorded. [ 2 ]