Allium cepa (Cepa Group) 'Stuttgarter'

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onion 'Stuttgarter'

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onion 'Stuttgarter' visionspictures.com

Other common names

onion 'Stuttgarter Giant'

Synonyms

Allium cepa 'Stuttgart Giant', Allium cepa 'Stuttgarter Giant'

RHS Recommended

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Herbs - Culinary Bulbs
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A popular, flat round variety with a yellow-brown skin, harvestable in Summer with good storage ability. Mild sweet flavour

Position

Full sun

Soil Types

Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1 year
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Clay Loam Sand
Moisture
Well–drained
pH
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)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Amaryllidaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Allium are bulbous herbaceous perennials with a strong onion or garlic scent, linear, strap-shaped or cylindrical basal leaves and star-shaped or bell-shaped flowers in an umbel on a leafless stem
Name Status
Accepted

How to Grow

Cultivation

Grow in fertile, moist but well drained soil, in full sun, in a sheltered site. Grow mint or other strong smelling companion plants near onion to deter onion fly. See vegetable cultivation, how to grow: onions and Onions, sets in spring trial 2025

Propagation

Propagate by seed. See sowing vegetable seeds

Pruning

No pruning required

Pests

May be susceptible to onion fly. birds may be a problem when young, cover with fleece until sets have rooted in

Diseases

May be susceptible onion white rot, leek rust and downy mildew