Delphinium 'King Arthur' |
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Photo Courtesy of Walters Gardens, Inc.
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| | Series Name: Pacific Giant Hybrids
Common Name: Delphinium |
Extremely tall, colorful spikes of royal violet flowers with white bees rise above distinctively cut leaves in early summer. If the main flower stalk is removed just after flowering, the plant will likely produce secondary blooms in late summer or early fall.
Delphiniums are a distinct class of perennials noted for their tall, stately appearance and true blue colored flowers, a hue that is relatively rare in the perennial world. 'King Arthur' is a Pacific Giant Hybrid, valued for its exceptional height.
Characteristics:
Height:
5-6 Feet
Spread:
18-24 Inches
Flower Color:
Purple shades
Foliage Color:
Green shades
Sun or Shade?:
Full sun (> 6 hrs. direct sun)
Part shade (4-6 hrs. direct sun)
Wet or dry?:
Average water needs
Want to see wings?:
Attracts butterflies
Attracts hummingbirds
Need critter resistant plants?:
Deer resistant
Rabbit resistant
How fast should it grow?:
Medium
When should it bloom?:
Early summer
Midsummer
Late summer
How's your soil?:
Average Soil
Fertile Soil
Sweet or Sour Soil?:
Neutral Soil (pH = 7.0)
Alkaline Soil (pH > 7.0)
What's your garden style?:
Cottage
Eclectic
Delphiniums thrive in the cooler climates of the north country, though they will grow as far south as zone 7. They grow best in rich, well-drained soil with a basic pH. If your soil is naturally acidic, adding lime will help to provide these conditions. They are also heavy feeders. The addition of compost or manure to the soil as well the use of granular fertilizer will result in healthier, stronger plants.
Delphiniums can be grown in full sun or partial shade, though full sun may help to prevent powdery mildew. When planting, be sure to set the crown at or above soil level to avoid rot. Since their stems are hollow, taller varieties of Delphiniums should be staked to prevent damage from wind and rain. These perennials tend to be short-lived and often start to lose their vigor after 2-3 years. Expect to replant them every few years or propagate new plants from basal cuttings of the original specimens.