Apium graveolens var. rapaceum 'Monarch'

RHS Plant Profile
celeriac 'Monarch'

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celeriac 'Monarch' Michael John Day
celeriac 'Monarch' RHS
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Annual Biennial

An excellent, high quality celeriac variety producing flatter-round, smooth, creamy stems that carry a subtle nutty flavour. It has good storage ability and can be harvested from September onwards

Position

Full sun

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full sun
Aspect
West–facing or 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)
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Apiaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Columnar upright
Potentially harmful
Harmful to skin with sunlight. Wear gloves and other protective equipment when handling
Genus
Apium can be annual, biennial or perennial herbaceous plants, with leaves divided into three leaflets, or pinnate; in summer, tiny white flowers are borne in umbels
Name Status
Accepted

How to Grow

Cultivation

Grow in fertile, well drained but moisture retentive soil in full sun. Incorporate plenty of organic matter. Sow indoors in March and transplant in May. See celeriac cultivation

Propagation

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

Pruning

No pruning required

Pests

May be susceptible to carrot fly and celery leaf-mining fly

Diseases

May be susceptible to celery leaf spot