Cucurbita maxima 'Atlantic Giant'

RHS Plant Profile

pumpkin 'Atlantic Giant'

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Annual Biennial

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A winter squash producing some of the largest of all pumpkins on trailing vines up to 5m (17ft) in length. The fruits can vary somewhat from a basic egg shape and exceed 1.8m (6ft in diameter. They have orange skins and bright orange flesh. In 2016, this cultivar produced a pumpkin 782kg (2,624.6 lbs) in weight, which was an official record at the time. Primarily grown for competitions as the flesh is somewhat watery, but it can be used in stocks and soups

Position

Full sun

Soil Types

Loam, Sand

Max Height

0.5-1 metres

Max Spread

4-8 metres

Size

Time to Maturity: 1 year
Max Spread: 4-8 metres
Max Height: 0.5-1 metres

Growing Conditions

Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Neutral

Position

Full sun

Aspect: South–facing or West–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H2

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Cucurbitaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Trailing
Potentially harmful: Humans/Pets: If crop is bitter, don't eat or feed to pets. Wear gloves and other protective equipment when handling
Genus: A small genus of climbing or trailing, annual herbaceous fruits. Several edible species are cultivated for food and other uses. Native to Central and South America. Solitary, star-shaped flowers are usually golden-yellow. Leaves are palmately lobed, covered with tiny, prickly hairs
Name Status: Accepted

How to Grow

Cultivation

Grow in fertile, moisture retentive but well drained, acidic to neutral soil in full sun. Sow indoors March to May in good quality seed compost. Sow the seeds on their side 1cm deep and maintain a constant temperature of 18-21C. Feed regularly with a high potassium fertiliser when the first fruits start to swell. See pumpkin cultivation or squash cultivation for further advice

Propagation

Propagate by seed. See sowing vegetable seeds

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Flower borders and beds

Pruning

No pruning required

Pests

Generally pest-free

Diseases

May be susceptible to grey moulds and powdery mildews