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Pumpkins are picked when mature in a once-over harvest or in several rounds, about 90 to 120 days after planting depending on the variety. Pumpkins are considered to be among the most efficient vegetable crops when evaluated on nutritional yield, land area and labor needed. Indicative figures for the seed yield of C. pepo are 400 to 1500 kg/ha. A valuable source of oil and protein is thus neglected if the seeds are left unutilized. In seed production, isolation between fields of different Cucurbita species is recommended, not only for the reason of purity but also for obtaining maximum yields (pollen of other species may cause reduced fruit set).