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Herbaceous PerennialBedding

Dahlia 'Fire Mountain' (D)

A bushy, tuberous perennial to around 1m high, with serrated, dark bronze leaves. Vivid red, miniature decorative flowers to 8cm across, finely edged with yellow-orange on the centre petals, are produced from late summer to early autumn

Synonyms

Dahlia 'Mountain of Fire'

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

South–facing or West–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
Genus: Dahlia are tuberous rooted perennials with pinnately divided leaves and showy flowerheads, double in many cultivars, in summer and autumn
Name status: Accepted
Horticultural Group: Decorative dahlias have fully double flowerheads with flat or slightly incurved florets

How to grow

Cultivation

Grow in fertile, humus-rich, well-drained soil, in full sun. Pinch out growing tips to encourage bushy plants. Plants will need support, see staking perennials. Water freely in dry periods. Lift and store tubers in autumn, particularly in heavy soils, or mulch well to protect from frosts. See dahlia cultivation for more advice

Propagation

Propagate by softwood cuttings, taken in spring from shoots from stored tubers, or by division, ensuring each tuber has at least one viable bud

Suggested planting locations and garden types

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

Pruning

Deadhead to prolong flowering. Cut back to near ground level in the autumn

Pests

May be susceptible to aphids, capsid bugs, caterpillars, leaf miners, glasshouse red spider mite and slugs. Earwigs sometimes damage blooms

Diseases

May be susceptible to powdery mildews in dry conditions, and to grey moulds and other fungal rots in wet weather. Virus diseases may cause stunting, leaf markings and distortion. Fungal rots can also damage stored tubers

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