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Herbaceous Perennial

Chrysanthemum 'Cousin Joan' (21d)

chrysanthemum 'Cousin Joan'

A compact, bushy, deciduous herbaceous perennial which is later flowering than other varieties. It produces dark green, lobed foliage and single, strongly fragranced, magenta-pink flowers with a paler pink inner ring and yellow centres during October and November

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Ultimate height

0.5–1 metres

Time to ultimate height

1 year

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

South–facing or West–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)

Botanical details

Family: Asteraceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Clump forming, 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: Unresolved
Horticultural Group: Single Korean chrysanthemums are perennials with lobed leaves and single flowerheads

How to grow

Cultivation

Grow in a cold frame in a peat-free, loam-based potting compost and move into a warm glasshouse in early autumn. Provide bright filtered light with good ventilation and a minimum temperature of 10°C. During the growing season water moderately and apply a balanced liquid fertiliser weekly

Propagation

Propagate by division or rooting softwood cuttings in peat-free potting compost at 16°C in spring. Pot on rooted cuttings in late June to early July into 23cm pots and pinch out as soon as established

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Wildlife gardens
Cut flowers
Flower borders and beds

Pruning

Pinch out growing tips and disbud as required

Pests

May be susceptible to leaf and bud eelworm, aphids, glasshouse whitefly, glasshouse red spider mite and capsid bug

Diseases

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

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