Pumpkin

Sun

Full sun, preferably at least 6-8 hours daily, in a warm position sheltered from strong winds.

Water

Keep the root zone evenly moist, especially during flowering and fruit swelling. Water deeply at soil level; avoid waterlogged soil.

Soil

Deep, fertile, well-drained soil enriched with compost or well-rotted manure; slightly acidic to neutral soil is ideal.

Height

1-3 ft (0.3-0.9 m) without support

Spread

10-30 ft (3-9 m) for typical trailing varieties; compact varieties spread less.

Flowers

Large yellow flowers from summer into early autumn; male and female flowers grow separately on the same plant.

Foliage

Large, roughly rounded to shallowly lobed green leaves with a coarse, hairy surface, carried on long, trailing stems.

Growth

Fast in warm weather.

Care needed

Medium

• Pollinators
• Low allergen
• Edible

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   0.5 ft (0.15 m)

2. After 1 year

   2 ft (0.6 m)

   full size

Full size in one season.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Growth rate

Fast

• Sow or plant out only after frost danger has passed and the soil has warmed to about 65°F (18°C).
• Allow the spacing stated for your variety; vigorous vines often need 6-10 ft (1.8-3 m) between plants.
• Water deeply during dry spells, keeping the soil moist rather than saturated.
• Mulch once the soil is warm to conserve moisture and suppress weeds.
• Mix compost into the planting area and feed according to soil fertility; avoid excessive nitrogen, which encourages leaves at the expense of fruit.
• Rest developing fruit on a board or dry straw to reduce contact with wet soil.

Pruning. Routine pruning is unnecessary; guide young vines into their allotted space and remove badly diseased leaves. In late summer, you can pinch out growing tips beyond established fruit to limit further growth, leaving plenty of healthy foliage.

Pick full-sized pumpkins in late summer or autumn, before the first frost; in frost-free areas, harvest as individual fruits mature. They are ready when the rind has its variety’s mature colour and resists a thumbnail, and the stalk is dry and corky. Cut with secateurs, leaving 5–10 cm (2–4 inches) of stalk, then cure undamaged fruits somewhere warm, dry and frost-free for 10–14 days before storing.

Early spring

Choose a variety that can mature within your frost-free season and prepare a sunny bed with compost; follow local seasons in either hemisphere.

Mid-spring

In short-season areas, sow indoors in individual pots about 3-4 weeks before the expected last frost.

Late spring

Harden off seedlings and plant after frost danger has passed, or direct-sow into warm soil.

Summer

Water consistently, guide vines and check flowers for pollination; hand-pollinate in the morning if small fruit repeatedly fail to develop.

Late summer

Keep ripening fruit off damp ground and check leaves for mildew.

Autumn

Harvest mature fruit before frost, leaving a short stalk attached. Cure sound fruit somewhere warm, dry and ventilated, then store cool and frost-free.

Late autumn

Clear frost-killed vines and remove diseased material; rotate next year's squash planting to another bed.

• Trail vines along the sunny edge of a kitchen garden, with room for them to spread away from paths.
• Use broad leaves and colourful autumn fruit as a seasonal feature in a large edible border.
• Grow compact or small-fruited varieties on a strong trellis, supporting heavy fruit individually with slings.
• Combine with sweetcorn and climbing beans in a generously spaced traditional food garden, keeping pumpkin foliage from smothering young plants.

Garden styles it suits: Potager (kitchen garden), Cottage garden, Farmhouse, Edible landscape, Homestead and Family-friendly.

Plant it with: Sweetcorn, Climbing beans, Nasturtiums, Borage and Calendula.

Wildlife: Flowers provide pollen and nectar for bees, including specialist squash bees in parts of the Americas. Avoid insecticides on open flowers and leave flowers accessible to pollinators.

• Powdery mildew: white patches develop on leaves, often late in the season. Choose resistant varieties, provide good spacing and steady watering, and remove badly affected leaves without stripping the plant.
• Slugs and snails: seedlings may be eaten overnight. Inspect after dark, remove pests and use locally approved controls where needed.
• Squash bugs and squash vine borers, especially in North America: inspect leaf undersides for bug eggs and stem bases for borer damage; remove eggs and affected material, and use insect mesh before flowering, removing it for pollination.
• Poor fruit set: inadequate pollination, cool weather or extreme heat can cause young fruit to yellow and drop. Hand-pollinate a newly opened female flower with pollen from a male flower in the morning and keep watering consistent.

Normally grown edible varieties are not known to be toxic to people, cats, dogs or horses; the flesh and seeds are edible. Exceptionally bitter fruit can contain poisonous cucurbitacins and cause severe vomiting and diarrhoea: discard it and do not feed it to animals, since cooking does not make it safe. Tough rind, stalks and large pieces can cause choking or digestive blockage in pets.

• Field pumpkin (Cucurbita pepo)

  Usually has a hard, sharply ridged fruit stalk and more angular, prickly foliage. Cucurbita maxima typically has a rounded, corky stalk without sharp ridges.

• Butternut squash (Cucurbita moschata)

  Has a hard, ridged fruit stalk that flares noticeably where it joins the fruit; the stalk of Cucurbita maxima is generally rounded and does not flare markedly.

Cucurbita is Latin for gourd, and maxima means largest, referring to the species' capacity to produce very large fruit.

Propagation. Grow from seed. Sow individual seeds about 1 in (2.5 cm) deep in warm conditions, and transplant young plants with minimal root disturbance. Saved seed may not come true because varieties of Cucurbita maxima cross readily with one another; use controlled pollination if maintaining a named variety.

Accepted botanical name

Cucurbita maxima

In the US and Canada

Introduced in the lower 48 states, Pacific Basin and Puerto Rico.

Native range

Argentina Northeast, Argentina Northwest and Bolivia.

Measured

Average height 500 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.