Delphinium

Delphinium grandiflorum

Larkspur

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Delphiniums are grown for their showy flowers carried in spikes or racemes. They are grown as garden plants as well as commercially as cut flowers. Most delphinium hybrids and cultivars are derived from D. elatum. Other hybrid crosses have included D. bruninianum, D. cardinale, D. cheilanthum, and D. formosum. The main flowering stems are erect and vary greatly in size between species, from 10 cm in some alpine species, up to 2m tall in larger meadow-land species.
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Planning

Difficulty

Moderate

Fruiting time

Summer, Spring

Harvesting

Harvest the flowers when the majority of florets on the flowering stem are open, they open from the base upwards.

Propagation

Seed

Sow seeds in late winter until early summer into trays filled with John Innes Seed Compost and cover with clear plastic, provide bottom heat and maintain temperature at 18-24C(65 -75F). Remove the cover when the seedlings appear, approximately in 2 to 3 weeks, Prick out into 7cm pots when large enough to handle. Plant out after the last frosts.

Special features

Pot plant

Can be grown in containers, increase watering if planted in containers.

Attracts useful insects

Attracts bees

Special features

Origin

Northern Hemisphere, mountainous regions

Environment

Light

Full Sun

Soil moisture

Wet

Soil type

Loam

Soil PH preference

Neutral

Frost hardiness

Hardy

Personality

Family

Ranunculaceae

Flower colour

Purple, Pink, Blue, White

Scent

None

Problems

Susceptible to slugs and snails, leaf miners, delphinium moth caterpillar, leaf blotch, powdery mildew and crown rot.
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Knowledge and advice

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