How to Care for a Delphinium in the Garden

Delphiniums are lively perennials that produce true blue flower spikes loaded with smaller blooms. The plants are extremely hardy and can be grown in U.S. Department of Agriculture zones 3 to 7 and sometimes zone 2 with extra protection. The genus is composed of at least 60 species and cultivars in different sizes and colors, with white, pink, yellow and red varieties available. Most delphiniums are native to Northern temperate regions and perform best where there are moderate temperatures and cooler summers. Delphniums are short-lived in Southern states but can be grown as annuals.

Compost
Shovel
Fertilizer
Stakes
Plant ties
Mulch
Pruners

Instructions

- 1
  Plant your delphiniums in well-drained soil. Incorporate 3 inches of compost to enhance drainage and add nutrients to a full sun planting bed.
- 2
  Water delphiniums with the equivalent of an inch of water per week. Soak them completely during irrigation and then let the soil dry out until the next irrigation.
- 3
  Drill a slim bamboo stake into the soil within 2 inches of the delphinium. Use plant ties to help hold up the flower spike.
- 4
  Spread an organic mulch around the base of the flower. Use 3 inches and leave a one-half inch gap around the base of the plant to prevent moisture buildup and rot. The mulch prevents weeds, conserves moisture and provides a layer of warmth when temperatures plummet.
- 5
  Cut off the flower stems to the base of the plant when they are done to prevent seed. Remove the foliage to the base of the plant when it turns yellow and begins to die back.

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