Growing organic pumpkins can be a fascinating experience providing you have the time and space – a single plant can cover over 500 square feet!
Sunlight: Full sun
Maturity: 85-125 days
Height: 1.5 to 3 feet
Spacing: 2 to 5 feet apart, 6 to 10 feet between rows
This annual warm-season vegetable is available in an array of attractive varieties, some of which don’t resemble pumpkins at all. They also dish up some powerful nutritional perks like vitamins A, E and C, along with minerals like phosphorous, calcium and potassium. A member of the Cucurbitaceae family, the pumpkin is closely related to squash, melons and gourds.
Fact: In 1996, Harold Baird of Kinburn, Ontario managed to grow four pumpkins – weighing 774, 686, 652, and 603 – on a single vine!
Pumpkins require full sun, ample water and plenty of room to grow. Choose a site that is protected from cool winds and work in large amounts of garden compost and well aged chicken manure. The soil should be tilled deep and over a large area – roots and vines can wander for 15 feet in any direction.
Tip: Old compost piles make great pumpkin patches.
How to Plant:
Start pumpkins indoors from seed or from nursery stock. Harden plants off and transplant outside when the soil is truly warm in the spring. Fertilize regularly with a balanced organic product, but try not to wet the leaves to avoid fungus disease. The entire root system should be kept moist at all times.
Once flowers begin to develop, hand pollinate female flowers (those with a bulb-like growth attached directly to the main stem) with a male flower (those with a slender stem). Pick a male flower, then touch it gently onto the female flower to ensure pollination.
Continue to provide ample water during the season. As temperatures warm, mulch the garden area with compost, leaves or straw to prevent weeds and conserve moisture.
Tip: If you want to grow a giant pumpkin, allow only the first two flowers on a vine to become pollinated, then pinch off all the other flowers so that there is only one or two pumpkins per vine.
Pumpkins are ready to harvest when they have a deep solid color and the vines die back and turn brown. Use floating row cover during a light frost and avoid leaving pumpkins out during a hard freeze to prevent softening. Allow 110-120 days to reach maturity.
Insects and Diseases:
Common insect pests that attack pumpkin include; cucumber beetles, squash vine borers and squash bugs. Apply organic pesticides to establish control. Remove crop debris and roto-till the garden after harvest to prevent future problems.
Bacterial wilt (spread by cucumber beetles), powdery mildew, downy mildew, and anthracnose are common plant diseases. Choose a site with good air circulation to prevent many fungal problems and apply organic fungicides (copper, sulfur) early, when symptoms first appear.
Seed Saving Instructions:
Pumpkins will cross-pollinate, so isolate by 1/4 mile. Seeds should be taken from fruits that have gone past maturity by three weeks. Remove seeds, wash and let dry.