Pea (Pisum sativum)
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A pea, although treated as a vegetable in cooking, is botanically a fruit; the term is most commonly used to describe the small spherical seeds or the pods of the legume Pisum sativum.[1] The name is also used to describe other edible seeds from the Fabaceae like the pigeon pea (Cajanus cajan), the cowpea (Vigna unguiculata) and the seeds from several species of Lathyrus.
P. sativum is an annual plant, with a lifecycle of one year. It is a cool season crop grown in many parts of the world, planting can take place from winter through to early summer depending on location. The average pea weighs between 0.1 and 0.36 grams.[2] The species is used as a fresh vegetable, frozen or canned, but is also grown to produce dry peas like the split pea. These varieties are typically called field peas.
P. sativum has been cultivated for thousands of years. The sites of cultivation have been described in southern Syria and southeastern Turkey, and some argue that the cultivation of peas with wheat and barley seems to be associated with the spread of Neolithic agriculture into Europe.[3]
The pea is a green, pod-shaped fruit, widely grown as a cool-season vegetable crop. The seeds may be planted as soon as the soil temperature reaches 10°C, with the plants growing best at temperatures of 13°C to 18°C. They do not thrive in the summer heat of warmer temperate and lowland tropical climates, but do grow well in cooler high altitude tropical areas. Many cultivars reach maturity about 60 days after planting. Generally, peas are to be grown outdoors during the winter, not in greenhouses. Peas grow best in slightly acidic, well-drained soils.
Peas have both low-growing and vining cultivars. The vining cultivars grow thin tendrils from leaves that coil around any available support, and can climb to be 1 - 2 m high. A traditional approach to supporting climbing peas is to thrust branches pruned from trees or other woody plants upright into the soil, providing a lattice for the peas to climb. Branches used in this fashion are called pea brush. Metal fences, twine, or netting supported by a frame, are used for the same purpose. In dense plantings, peas give each other some measure of mutual support.