Plant Guide

Delphinium grandiflorum

Pronunciation: del-FIN-ee-um grand-ih-FLO-rum
Family: Ranunculaceae, Buttercup
Common Name: Delphinium
Plant Type:
  • perennial

Height to: 2'
Width to: 2'
USDA Hardiness Zones:
  • -30 to -40ºF ZONE 3
  • -20 to -30ºF ZONE 4
  • -10 to -20ºF ZONE 5
  • 0 to -10ºF ZONE 6
  • 10 to 0ºF ZONE 7
  • 20 to 10ºF ZONE 8

Bloom Description: Delphinium grandiflorum bear violet to blue or white flowers, loose inflorescence, more rounded shape
Bloom Season:
  • early summer
  • mid summer
  • late summer

Sun Exposure:
  • full sun
  • part sun

Soil Type: well-drained, organic
Pests and Diseases: Delphinium grandiflorum is susceptible to bacterial leaf spot, crown rot and black leg; fungal crown and stem rots, damping-off, powdery mildew, leaf spots; viruses; aphids, cutworms, borers, leaf miners, beetles, sowbugs, root mealybug, mites, nematodes, slugs
Propagation: fresh seed or stratify, solid spring basal cuttings

Growth rate: moderate to fast

Foliage: palmately lobed or divided

Light: sun

Landscape habit, uses: front to back of borders

Other interest: hollow and brittle stems, short-lived in the South

Other culture: require heavy fertility, staking of tall cultivars Source: Perry's Perennial Pages, University of Vermont and The American Horticultural Society A to Z Encyclopedia of Garden Plants


Submitted by: Pectiwiccan
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