Cucurbita moschata 'Waltham Butternut'

RHS Plant Profile

squash 'Waltham Butternut'

Annual Biennial

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A popular cultivar of butternut squash, producing roughly bell-shaped fruits on trailing vines up to 2.5m (8ft) long. The smooth, pale orange, hard-skinned fruits, are ready to harvest in autumn and can reach around 1.8-2.3kg (approximately 4-5lbs) in weight. They store well over winter once ripe and have bright, orange flesh, with a sweet, nutty taste.

Position

Full sun

Soil Types

Loam, Sand

Max Height

0.5-1 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity: 1 year
Max Spread: 1.5-2.5 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: Unresolved

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 cucurbit cultivation

Propagation

Propagate by seed. See sowing vegetable seeds

Suggested planting locations and garden types

Patio and container plants

Pruning

No pruning required

Pests

Generally pest-free

Diseases

May be susceptible to grey moulds and powdery mildews