We had a couple volunteers last year we watered from time to time and ended up
with a good 12 pumpkins about a foot in diameter.... We haven't had quite the
same luck this year, I have had vines grow but as soon as a bloom opens the
squirrels eat them.... I happen to feed pumpkin seeds to the squirrels and
that's where they come from here. Not really an answer for you but they seemed
to not mind being just left alone to do their thing here and we were in drought
conditions last year.

Colleen
zone 5 CT