Asparagus officinalis 'Guelph Millennium'

RHS Plant Profile
asparagus 'Guelph Millennium'

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A vigorous, all male asparagus variety producing heavy yields of purple tipped, green spears between April and June. Bred in Canada, it is particularly cold tolerant and suitable for most soil types

Position

Full sun

Soil Types

Sand, Loam, Clay, Chalk

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
5–10 years
Max Spread
0.5-1 metres
Max Height
0.5-1 metres

Growing Conditions

Sand Loam Clay Chalk
Moisture
Well–drained
pH
Neutral or Alkaline

Position

Full sun
Aspect
South–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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asparagaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Suckering
Potentially harmful
The young shoots (spears) are edible when cooked. Wear gloves for picking spears as they may a cause skin allergy. Fruits are harmful if eaten
Genus
Asparagus can be evergreen or deciduous perennials or subshrubs, sometimes climbing, with tuberous rootstock. Stems bear both inconspicuous scale-like leaves and larger, leaf-like phylloclades, with small white or pinkish flowers followed by red berries
Name Status
Accepted

How to Grow

Cultivation

Grow in moderately fertile, well drained soil in full sun. Plant one year old crowns or sow seed direct between March and April. Do not harvest in first year, half-harvest in second year and take a full harvest in the third year. See vegetable cultivation

Propagation

Propagate by crowns. Although propagation by seed is possible, it is not advisable as seedlings take longer, and may not be male cultivars which produce better plants

Suggested planting locations and garden types

  • Wildlife gardens

Pruning

Cut a few spears, if any at all, in the first two years to allow the plant to build up strength. Cut the foliage when yellowed to 2.5cm above the soil

Pests

May be susceptible to asparagus beetle, slugs

Diseases

May be susceptible to foot and root rot