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D
FlowersHardyPerennial (short-lived)
Delphinium
Delphinium is a stately hardy perennial grown for tall flower spires that add height and drama to early and midsummer borders. It is a classic cottage-garden and cut-flower plant, especially valued where strong vertical structure is needed.
Basic information
Category
Flowers
Lifecycle
Perennial (short-lived)
Hardiness
Hardy
Planting partners
0 companions · 0 crops to avoid
Growth profile
Germination window
14–21 days
Germination temperature
15–18 °C
Plant spacing
75 cm
Row spacing
75 cm
Sowing depth
0.5 cm
Height
180 cm
Spread
75 cm
Calendar
JJan
FFeb
MMar
AApr
MMay
JJun
JJul
AAug
SSep
OOct
NNov
DDec
Sow Indoors
Sow Outdoors
Plant Out
Flowering / Harvest
Timings based on average frost dates in the UK. Sign up to set your frost dates.
Care tips
Grow delphiniums in fertile moisture-retentive soil in a sheltered sunny spot, and stake early before stems become heavy with flower spikes. Cut back after the first flush if growth is healthy, and feed and water well to encourage the possibility of a lighter second display.
Common pests
Slugs, aphids, powdery mildew, crown rot.
Companions
No companion crops have been added yet.
Don’t grow with
No crops to avoid have been added yet.