Burgess Buttercup Organic Squash Seeds 4180 Heirloom Vegetable. An introduction form the early 1930’s, Burgess Buttercup produces smallish fruit averaging 1.7 kg (3.7 lbs) with sweet, fibreless, thick orange coloured flesh and a distinct cup on the blossom end. The skin on mature fruit is buff green in colour with narrow grey stripes. This is a very reliable variety that generally produces a large crop. Winter squash typically mature later in the season and are heavy skinned varieties that are ideal for long term storage!