Descanso Garden Club

Delphiniums for Descanso Gardens

Delphinium is an upright perennial with a showy spike of blooms. Many choices are available in shades of blue, white, lavender and purple. There are even a few species with red or yellow blossoms. These do very well in a border or as a focal point in a large cluster or bed. There are a few shorter selections that do well in rock gardens. The foliage may irritate skin.

• CULTIVATION:
  • Location: Plant in full sun providing shelter from the wind.
  • Soil: Delphinium likes fertile, well-drained soil.
  • Water: Water freely while plant is growing. Reduce water in late fall to encourage winter dormancy.
  • Pruning: Regularly cut spent flower spikes back to a leaf node to allow developing flower shoots to grow.
  • Seasonal care: Provide support for tall flower spikes after growth starts in spring. Cut back dead stalks and leaves after growth dies back.
• PROPAGATION: Delphiniums may be started from seed in early spring. You can also make basal cuttings after growth begins in spring.
• PROBLEMS: Long, hot summers and dry climates may cause some wilt. Regular watering and part shade may help.
• SOURCES: Armstrong Nursery usually provides perennial six-pacs in early December. Larger plants from local nurseries and mail order sources.

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