Another miniature variety that works great for decorating is the Baby Boo pumpkin--it is actually white in color when ripe. Plant 3 to 4 miniature pumpkin seeds in the center of the container to a depth of ½ to 1 inch when the soil has warmed to 70 degrees Fahrenheit. Swimming Pumpkins August Garden Thoughts August Garden Gardening For Dummies Growing Pumpkins Pumpkins are heat-loving plants. How to grow mini pumpkins . As such they should not be planted in the ground until the soil is warm enough and the risk of frost has ended. For mini pumpkins a 10-gallon container will work. How to Grow Pumpkins in Pots. Such as Jack Be Little or Wee-B-Little takes up far less space than the larger pumpkins. Make sure there are generous drainage holes and consider using an unglazed pot so excess moisture doesnt build up. Put in six foot dowel rods next to the pumpkins in the clay pots. You can grow pumpkins on a scaled down basis in containers. Having said that this orchid sp...