Green Hubbard Squash Seeds (Winter Type) Heirloom Vegetable. The wild ancestor of the Hubbard squash is alleged to have originated from South American locations where summers are similar to southern Ontario. Tough, slightly warted fruits have a bronze-green rind. The large fruits average 30 cm (12″) long by 20 cm (8″) wide. The flesh is orange-yellow, very thick, dry and nicely sweet. This squash needs lots of space as the vines are lengthy and fruit are large. Benefits from straw mulch to protect fruit from contact with soil. Remedy drought stress by under foliage watering especially while fruit is growing. Avoid wetting foliage as much as possible. Introduced in the late 1790’s.