I was given a pumpkin plant that i put into a big container in my green house, and left it in there it has now overtaken my green house, but the little jellow bulbs start to grow then go brown and squashy, what am i doing wrong i dont know if i can put it in the garden as i think the chickens will eat them, its now about 10ft long with loads of pumpkins growing, please help before i lose them all, Thanks