I have grown some nice pumpkins this year. 5 large ones in all. out of two plants my girls started from seed. only one turned orange, the rest are turning but not yet. my question is : we have had two heavy frosts , the leaves of the plant have died. it's too late for the plant i'm sure, but should i cover the pumpkins and leave them attached or cut them off ? I really don't mind green pumpkins but wondering if they would turn orange off the vine. thanks !