Not the plant you're looking for? Search over 300,000 plants
Herbaceous Perennial

Chrysanthemum 'Sea Urchin' (21f)

chrysanthemum 'Sea Urchin'

'Sea Urchin' is a relatively low-growing cultivar, to 55cm in height. Flowers in mid autumn with yellow quilled florets

Synonyms
Dendranthema 'Sea Urchin'
Buy this plant
Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
1 year
Ultimate spread
0.1–0.5 metres
Growing conditions
Loam
Moisture
Moist but well–drained
pH
Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Green
Autumn Yellow Green
Winter
Position
  • Full sun
Aspect

South–facing or East–facing

Exposure
Sheltered
Hardiness
H3
Botanical details
Family
Asteraceae
Native to the UK
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

Accepted

Horticultural Group
Korean chrysanthemums (21f) are perennials with a range of flower types, including Spider, with long, narrow, pendent ray florets; Spoon, with tubular rays opening to a spoon-shape at the tip; and Quill, with slender, tubular rays oblique at the tip

How to grow

Cultivation

Korean chrysanthemums are borderline hardy. Overwinter more tender cultivars in a cold frame. Needs a sunny site with moderately fertile, well-draining soil. See chrysanthemum cultivation

Propagation

May be propagated by division in late spring or by cuttings

Suggested planting locations and garden types
  • Flower borders and beds
Pruning

Cut down after flowering

Pests

May be susceptible to chrysanthemum leaf miner, glasshouse whitefly and aphids

Diseases

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

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.