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An apple tree in Germany. Many apples grow readily from seeds. However, apples must be propagated asexually to obtain cuttings with the characteristics of the parent. This is because seedling apples are "extreme heterozygotes". Rather than resembling their parents, seedlings are all different from each other and from their parents. [42]
Malay apple is a strictly tropical tree and will be damaged by freezing temperatures. [12] It thrives in humid climates with an annual rainfall of 152 cm (60 in) or more. It can grow at a variety of altitudes, from sea level up to 2,740 m (8,990 ft). The tree can grow to 12–18 m (39–59 ft) in height.
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 fruit or "apple" is usually produced early in summer and ripens later in summer. Many species of plants have mycorrhizae to assist with nutrient uptake in infertile conditions. Mayapple plants are considered obligately dependent upon such mycorrhizae, although it may also be facultatively dependent upon rhizome age and soil nutrient levels ...
Malus baccata is an Asian species of apple known by the common names Siberian crab apple, [2] Siberian crab, [3] Manchurian crab apple and Chinese crab apple. [ 4 ] [ 5 ] [ 6 ] It is native to many parts of Asia, but is also grown elsewhere as an ornamental tree and for rootstock .
Malus niedzwetzkyana, or Niedzwetzky's apple, is a kind of apple native to Asia noted for its red-fleshed, red-skinned fruit and red flowers. Some botanists consider it a distinct species, while others have argued that it is simply an unusual variety of the common apple .
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 ]
Malus hupehensis is a vigorous deciduous tree growing to 12 metres (39 feet) tall and broad. [citation needed] It has pink buds, opening to fragrant white blossoms in spring. It produces bright red, cherry-sized crab-apples in the autumn. [7]