Everything about Crabapple totally explained
Malus, the
apples, is a genus of about 30–35 species of small
deciduous trees or
shrubs in the family
Rosaceae. Other studies go as far as 55 species including the domesticated
Orchard Apple, or Table apple as it was formerly called (
M. sylvestris domestica, derived from
M. sylvestris sieversii, syn.
M. pumila). The other species and subspecies are generally known as "wild apples", "crab apples", "crabapples" or "crabs", this name being derived from their small and tart
fruit. Cultivars such as 'Whitney' have been independently domesticated for better fruit quality.
The genus is native to the
temperate zone of the
Northern Hemisphere, in
Europe,
Asia and
North America.
Apple trees are small, typically 4–12 m tall at maturity, with a dense, twiggy crown. The
leaves are 3–10 cm long, alternate, simple, with a serrated margin. The
flowers are borne in
corymbs, and have five
petals, which may be white, pink or red, and are
perfect, with usually red stamens that produce copious
pollen, and an inferior ovary; flowering occurs in the spring after 50–80
growing degree days (varying greatly according to subspecies and cultivar). Apples require cross-pollination between individuals by
insects (typically
bees, which freely visit the flowers for both
nectar and
pollen); all are self-sterile, and (with the exception of a few specially developed cultivars) self-pollination is impossible, making pollinating insects essential. The
honeybee and
mason bee are the most effective insect pollinators of apples.
Malus species, including domestic apples,
hybridize freely.
Malus species are used as food plants by the
larvae of a large number of
Lepidoptera species; see
list of Lepidoptera that feed on Malus.
The
fruit is a globose
pome, varying in size from 1–4 cm diameter in most of the wild species, to 6 cm in
M. sylvestris sieversii, 8 cm in
M. sylvestris domestica, and even larger in certain cultivated orchard apples; among the largest-fruited cultivars (all of which originate in North America) are 'Wolf River' and 'Stark Jumbo' . The centre of the fruit contains five
carpels arranged star-like, each containing one to two (rarely three)
seeds.
One species,
Malus trilobata from southwest
Asia, has three- to seven-lobed leaves (superficially resembling a
maple leaf) and with several structural differences in the fruit; it's often treated in a genus of its own, as
Eriolobus trilobatus.
Uses
For
Malus sylvestris domestica, see
Apple. The fruit of the other species isn't an important crop in most areas, being extremely sour and (in some species) woody, and is rarely eaten raw for this reason. However, crabapples are an excellent source of
pectin, and their juice can be made into a ruby-coloured
jelly with a full, spicy flavour. A small percentage of crab apples in
cider makes a more interesting flavour.
Crabapples are widely grown as ornamental trees, grown for their beautiful flowers or fruit, with numerous
cultivars selected for these qualities and for resistance to disease.
Some crab apples are used as rootstocks for domestic apples to add beneficial characteristics. For example, varieties of Baccata, also called Siberian crab, rootstock is used to give additional cold hardiness to the combined plant for orchards in cold northern areas
They are also used as
pollinizers in apple
orchards. Varieties of crab apple are selected to bloom contemporaneously with the apple variety in an orchard planting, and the crabs are planted every sixth or seventh tree, or limbs of a crab tree are grafted onto some of the apple trees. In emergencies, a bucket or drum bouquet of crab apple flowering branches are placed near the beehives as orchard pollenizers. See also
Fruit tree pollination.
Because of the plentiful blossoms and small sized fruit, crab apples are popular for use in
bonsai culture. Because the trees are small due to the requirements of the hobby, but still show the abundant fruit bearing of full sized crab apples, it's important to thin out fruit so that trees don't exhaust themselves.
Further Information
Get more info on 'Crabapple'.
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