Plant pumpkin seeds after last frost date. Fill the 13 inch round container with soil to one inch below the rim. Plant 3 seeds one inch deep in the middle of the container. Cover with soil. You do not have to make a hill as the “container” is your hill. If you wish, you can make a small hill in the middle of the container and plant the seeds in the hill.
Once the pumpkin seedlings are two inches tall, thin them to one plant per container. In larger containers, you can have 2 to 3 pumpkin plants per container. Smaller pumpkin varieties grow better in all types of containers.
You can pinch the vines back once the fruits appear to limit vine growth. You can place boards under larger pumpkins to keep them from rotting. Harvest the pumpkins once the vines have turned brown and died.