Pumpkins will do best in soil that has been enriched with a little compost (about 1 inch of compost mixed in to soil. We grow them in "hills:" about a foot high and a foot wide, spacing 4-6 seeds around the top of the hill, and thinning to the best 3-4 plants. Keep them watered (but not water-logged) as the young plants start to emerge. They will grow long (12-20') vines. You can expect pumpkins that weigh in anywhere from 15 to a whopping 40 pounds.