The largest fruits are giant pumpkins, specially grown and bred for their size. Growing giant pumpkins is a fine art, and there are many different ideas about how to do it best.
Many growers keep their methods secret.
Some use heating cables to protect against cold weather, or special fertilizers for maximum growth. Giant pumpkin vines are pampered and watched carefully. These facts are from Education World . Leafy vines grow from pumpkin seeds. Yellow-orange flowers bloom on the pumpkin vine, then wither.