Can you grow a pumpkin in a grow bag, or does it need to be in the ground? (I have two grow bags on top of eachother) It is for my son who is having a school competition to grow the largest pumpkin. I have 2 pingpong ball sized pumpkins growing so far, and another two have just started growing....someone told me that you have to pick off the flowers, do i need to do this, and if yes when do i do this? And something about cutting the vines???? Also some of the leaves are shrivling up. Please can you help me and give me any tips on how i can grow this pumpkin to make it as big as possible. I have never grown a pumpkin before, so any help would be much appreciated! Thanks peeps!!