I have long wanted to try this, and this year I did. It took me well over 2 hours to clean out 6 pumpkins, and that was with the help of DH with the power saw to cut off the tops!
So far, they have lasted a week in 95 degree weather!
I planted them in soil inside with drain holes.
A friend of mine made a blog post about it! http://flowergardengirl.com/2012/10/01/pumpkin-lemongrass-ch...