Allium cepa (Cepa Group) 'Fasto'PBR

RHS Plant Profile
onion 'Fasto'

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Herbs - Culinary Bulbs
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Vigorous early onion making golden, spherical, smooth-skinned bulbs. Stores well

Position

Full sun

Soil Types

Sand, Loam, Chalk

Max Height

0.1-0.5 metres

Max Spread

0-0.1 metre

Size

Time to Maturity
1 year
Max Spread
0-0.1 metre
Max Height
0.1-0.5 metres

Growing Conditions

Sand Loam Chalk
Moisture
Moist but well–drained
pH
Neutral or Alkaline

Position

Full sun
Aspect
East–facing or 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)
H4

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

Thin plants to 15cm apart. Water in dry weather and feed every two weeks with a general purpose fertiliser. Cease watering and feeding once bulbs have swollen in mid-summer. Onions can be harvested as soon as they're big enough to use. See advice profiles for onions and shallots for further information

Propagation

Propagate by seed or by onion sets. See how to grow: onions or sowing vegetable seeds

Pruning

No pruning required

Pests

May be susceptible to onion fly and allium leaf miner

Diseases

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