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The ginkgo,
or maidenhair tree by which it is also known, is native to China.
It is the oldest "nut" tree, surviving for about 150 million
years. Its fan-shaped leaf resembles the leaflet of the maidenhair
fern. Its distinctive leaf and tree form make it a fine ornamental.
It adapts to a wide range of climates and soils, but does need good
drainage. It can grow up to 30 m in height, but its open foliage
does not suppress grass and other plants under it. It is hardy for
much of Southern Ontario. For a tree that has been with us so long,
it has surprisingly few diseases and pests, so it makes a good city
tree, where spraying is discouraged.
It produces
both male and female trees and one of each is needed to produce
nuts. It is not possible to determine the sex of a tree until it
begins to bear and that may take 10 or more years. The nut is enclosed
in a soft fleshy husk. When the nuts fall in the autumn, the husk
can cause a foul smell, so they should not be planted near walkways.
The Western
World only appreciates the ginkgo as an ornamental tree and for
this reason, the only western cultivars are male clones. In China,
there are numerous female selections that are propagated for very
specific nut characteristics. The nutritious nuts are considered
a delicacy and are used raw, roasted and in cooking. Interest in
the nuts as a food is growing in North America, as the palate for
Oriental foods expands. The leaves are also put to use as an herbal
medicine. It has properties which help to expand the blood vessels,
help the heart and improve memory.
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