Sow pumpkins in the garden in spring when all danger of frost has passed, and the soil temperature has reached 65°F, and night air temperatures are above 55°F.
Pick pumpkins when they are deeply colored–deep orange or golden white–and stems and vines have dried and turned brown. The rind should be hard, not easily penetrated by a fingernail. Thump maturing pumpkins; a ripe pumpkin will sound hollow when thumped.
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