Cucurbita pepo 'Jemmer'

RHS Plant Profile

courgette 'Jemmer'

RHS

Annual Biennial

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A large, vigorous annual, 1.2m tall and wide, producing a short, fleshy, horizontal stem and large, deeply lobed, dark green leaves with silver markings. The stems and leaf undersides have sharp bristles. Large, yellow, edible flowers, male and female separate, appear in summer followed by slim, smooth-skinned, cylindrical, yellow fruit eaten as courgettes or summer squash

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1-1.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity: 1 year
Max Spread: 1-1.5 metres
Max Height: 1-1.5 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained
pH: Acid or Alkaline 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: Bushy, 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

Start seeds off indoors from mid-April, or outdoors after all risk of frost has passed. Grow in soil enriched with compost or well-rotted manure, or in a peat-free growing bag, or large tub of peat-free multipurpose compost. Keep well-watered and feed every 10-14 days with a high potash liquid fertiliser once the first fruits start to swell. See courgette cultivation

Propagation

Propagate by seed. See sowing vegetable seeds or sowing seeds indoors for further advice

Suggested planting locations and garden types

Patio and container plants
Wildlife gardens

Pruning

No pruning required

Pests

May be susceptible to slugs and snails

Diseases

May be susceptible to grey moulds on the fruit and powdery mildews on the foliage but this cultivar has some resistance