Pumpkins have been in cultivation for over 5000 years, there are hundreds of varieties and sizes available. From small ones which can be crown in container, to giants (the biggest pumpkin weighted 667 kilos and was grown in USA).
Growing pumpkins is almost the same as growing watermelons. They require a sunny location, a lot of compost, leaves or manure, well drained soil and protection from cold winds. In frost-free areas (tropics or subtropics) pumpkins can grow all year round.
Pumpkins require temperature of 20˚C for growing. I recommend to plant pumpkins in exactly the same way as watermelons: use individual pots for each garden seed. It’s better to use paper pots (I sell next generation paper pot maker for the lowest price on the Web) as they can be planted directly in the garden. Plant pumpkins indoors about 3 weeks before the last frost. After the last frost plant them outside in the sunny location.
Pumpkins take 70-160 days to mature depending on their variety. Miniature pumpkins mature within 90-100 days and giant ones within 130-160 days.
Plant pumpkins in hills or rows. Follow the spacing instructions on the sachet as pumpkins can spread very far. Allow at least 5 feet between plants in each direction.
Pumpkins require a lot of water especially in the blooming period. Make sure the plants get 1 to 2 inches of water a week. They are a big feeders too so fertilize them on a regular basis.
Carefully rotate pumpkins from time to time to keep them symmetrical.
Harvest comes when the pumpkins are bright-yellow after the vines have died.
You can save garden seeds 1 month after harvesting pumpkins. Just scoop seeds from flesh, wash, dry and keep in a cool, dry place away from sun.