About
This easy-going perennial with green divided foliage and sturdy upright stems which produce racemes of pale blue flowers in the summer.
About the genus
Delphinium can be annuals, biennials or perennials, with palmately lobed basal leaves and showy bowl-shaped flowers in spikes, racemes or panicles
Growing conditions
SunlightFull sun
Soil typeChalk, Loam, Sand
Soil pHAcid, Alkaline, Neutral
Soil moistureMoist but well-drained
AspectSouth-facing, West-facing
ExposureSheltered
UK hardinessH6
Plant details
Plant typeHerbaceous Perennial
HabitClump forming, Columnar upright
FoliageDeciduous
Height0.5-1 metres
Spread0.5-1 metres
Time to full height2-5 years
Suggested usesCity and courtyard gardens, Cottage and informal garden
ToxicityHumans/Pets: Harmful if eaten. Wear gloves and other protective equipment when handling. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Care notes
CultivationGrow in a fertile, well-drained but moisture-retentive soil in full sun, in a position sheltered from strong winds, and provide stakes or other supports. See staking perennials and delphinium cultivation for further advice
PruningNo pruning required except deadheading, cutting spent flower spikes back to flowering sideshoots, and cutting all growth down to ground level at the end of the growing season
PropagationPropagate by basal softwood cuttings in spring, or by division in early spring or early autumn
Pest resistanceMay be susceptible to aphids, earwigs, delphinium leaf miner, delphinium moth caterpillars, slugs and snails
Disease resistanceMay be susceptible to powdery mildews, delphinium black blotch, grey moulds, sclerotinia disease, crown rot and cucumber mosaic virus