About
This popular, tuberous-rooted perennial to 1m in height, with very dark purple-green foliage. Peony-shaped, semi-double bright red flowers 6cm in width, with bright yellow anthers, appear from summer to autumn.
About the genus
Dahlia are tuberous rooted perennials with pinnately divided leaves and showy flowerheads, double in many cultivars, in summer and autumn
Growing conditions
SunlightFull sun
Soil typeChalk, Clay, Loam, Sand
Soil pHAcid, Alkaline, Neutral
Soil moistureMoist but well-drained
AspectWest-facing, South-facing
ExposureSheltered
UK hardinessH3
Plant details
Plant typeBedding, Herbaceous Perennial
HabitColumnar upright
FoliageDeciduous
Height0.5-1 metres
Spread0.1-0.5 metres
Time to full height1-2 years
Suggested usesCottage and informal garden, City and courtyard gardens, Patio and container plants
ToxicityAll parts may cause severe discomfort if ingested and may irritate skin. Wear gloves and other protective equipment when handling
Care notes
CultivationGrow in fertile, humus-rich, well-drained soil, enriched with organic matter, in full sun. Pinch out growing tips to encourage bushy plants and stake - see staking perennials. Water as needed in dry periods. Lift and store tubers in autumn to replant, or use as a source of cuttings, in spring. See dahlia cultivation and our video How to plant dahlia tubers and care tips
PruningDeadhead to prolong flowering. Cut back to near ground level in the autumn, before lifting and storing for the winter
PropagationPropagate by softwood cuttings taken in spring from shoots from stored tubers, or divide the tubers ensuring each division has a viable bud
Pest resistanceMay be susceptible to aphids, capsid bug, earwigs, caterpillars and glasshouse red spider mite
Disease resistanceMay be susceptible to a virus, tubers may rot in store