Chrysanthemum Ernst ('Yoernst')

RHS Plant Profile
chrysanthemum [Ernst]

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chrysanthemum [Ernst] RHS

Synonyms

Chrysanthemum 'Yoernst'

Plants for pollinators
Herbaceous Perennial

A bushy perennial with single, daisy-like flowers 2.5cm across, the rays yellow, tipped with bronze, the disk yellow

Position

Full sun, Partial shade

Soil Types

Loam

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
West–facing or South–facing or East–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
Asteraceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Skin allergen. Wear gloves and other protective equipment when handling
Genus
Chrysanthemum are erect woody-based perennials with aromatic, pinnately lobed leaves and flowerheads of diverse form, from late summer to late autumn
Name Status
Trade

How to Grow

Cultivation

Grow-on young plants starting in a 7.5cm pot in peat-free John Innes No2, potting them on until they have reached a pot size of 23-30cm. At this stage use peat-free JI No3 compost and bring the plants into a cool greenhouse in the autumn minimum 10°C where they are to flower. Water moderately throughout the growing season and feed weekly with a balanced liquid fertiliser

Propagation

Propagate by basal softwood cuttings from overwintered stools in late winter or early spring. Cuttings should be rooted in a peat-free compost the surface of which is covered with dry sand and kept in a temperature of 16°C. Place in a cold frame after first rooting and protect from frost. Harden off in mid spring. Established clumps may be propagated by division in spring.

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Patio and container plants
  • Flower borders and beds

Pruning

Cut back old stems to 5cm after the flowers have finished

Pests

May be susceptible to aphids, capsid bug, earwigs, eelworms, mealybugs glasshouse red spider mite and glasshouse whitefly

Diseases

May be susceptible to glasshouse grey mould, powdery mildews and chrysanthemum white rust