Pumpkin

A pumpkin is a vegetable, most commonly orange in colour when ripe, that grows as a fruit (gourd) from a trailing vine of the genus Cucurbita (Cucurbitaceae). more...

Cultivated in North America, continental Europe, as well as in English cottage gardens, Cucurbita varieties include Curcurbita pepo, Cucurbita maxima, Cucurbita mixta, or Cucurbita moschata — all plants native to the Western hemisphere. The pumpkin varies greatly in form, being sometimes nearly globular, but more generally oblong or ovoid in shape. The rind is smooth and very variable in colour. The larger kinds acquire a weight of 40 to 80 lb (18 to 36 kg) but smaller varieties are in vogue for garden culture. Pumpkins are a popular food, with their innards commonly eaten cooked and served in dishes such as pumpkin pie. Pumpkins are traditionally used to carve Jack-o'-lanterns for use as part of Halloween celebrations.

Pumpkins and squashes

The name "squash" is applied in America to this and other species of the genus Cucurbita. The name is adapted from an American Indian word (see L. H. Bailey, Cyclopaedia of American Horticulture, for a fuller account of the squashes).

Summer squashes, like pumpkins, are mostly varieties of Cucurbita pepo; if picked while immature they are eaten as summer squash or marrow, but if left to mature on the vine will form a hard fruit like winter squash. Winter squashes are either C. maxima or C. moschata, and are not eaten in immature form. The varieties of pumpkins and squashes are numerous and great variety in size and shape; it is difficult to keep them pure if various kinds are grown together, but the true squashes (C. maxima) do not hybridize with the true pumpkin (C. pepo) species. If carefully handled to avoid cracking of the skin, and kept dry and fairly warm, winter squashes may be kept for months.

Studies by the Royal Military College of Canada show promise for pumpkins and other members of the Cucurbita pepo family to be viable candidates for DDT phytoremediation. (see Scientific American, October 25, 2004)

Cultivation

Pumpkins have historically been pollinated by the native squash bee Peponapis pruinosa, but this bee has declined, probably due to pesticide sensitivity, and most commercial plantings are pollinated by honeybees today. One hive per acre (4,000 m² per hive) is recommended by the US Department of Agriculture. Gardeners with a shortage of bees, however, often have to hand pollinate.

Inadequately pollinated pumpkins usually start growing but abort before full development. Often there is an opportunistic fungus that the gardener blames for the abortion, but the solution to this problem of abortion tends to be better pollination rather than fungicide.

Pumpkins are grown today in the US more for decoration than for food, and popular contests continually lead growers to vie for the world record for the largest pumpkin ever grown. Growers have many techniques, often secretive, including hand pollination, removal from the vines of all but one pumpkin, and injection of fertilizer or even milk directly into the vines with a hypodermic needle.

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