Cucurbita maxima 110 days. Mammoth and colossal don't begin to describe this one. The granddaddy of them all, Atlantic Giant can tip the scales at over 800 pounds. This buff-colored heirloom squash has taken first prize for size in contests all over the US. Rambling vines easily reach 15 feet and set 2-4 fruit per plant. Approximately 2-3 seeds per gram.