Delphiniums, commonly known as Larkspur, beautify the summer garden with showy, spiky blooms on a tall, sometimes towering stem. They come in a range of shades. Many gardeners wonder how to grow Delphinium, and some avoid planting them after hearing that the plant is difficult to grow.
One commonly thinks of Delphinium plants as having true blue flowers, the most common color. But numerous hybrids are available in shades of pink, lavender, red, white, and yellow. Blooms may be single or double. Delphinium planting usually is at the back of the bed, where flower spikes can reach up to 6 feet (1.8 m) tall. Delphinium flowers are often planted in masses or groups. Shorter varieties are useful in other areas of the garden.
Growing Conditions and General Care
Grow Delphiniums in a sunny area with consistently moist soil. Don't let them dry out. Mulch helps retain moisture and keeps roots cool. The performance of this specimen is enhanced when growing Delphinium plants in neutral to slightly alkaline soil pH. Soil should be well-draining.
Care of Delphinium should include regular fertilization in spring when the plant begins to grow and during the flowering period. Work in well-composted organic material such as rotted cow manure, or use a basic 10-10-10 granular fertilizer. Yellowing foliage or stunted growth often indicates the plant needs more fertilizer.
Sun exposure is another aspect of Delphinium care that the gardener must get right for the showy blooms to appear. Gentle morning sun is preferable to the Delphiniums, which are picky about extreme differences in temperatures. Provide afternoon shade, especially when planted in hotter zones.
An important aspect of caring for the thought to be difficult Delphinium is deadheading the first blooms in early summer. Remove flower stalks when blooms are spent. When all blooms are removed and moisture and fertilization requirements are met, the gardener can expect a bountiful blast of blooms in late summer or early autumn. This is when Delphinium flowers are at their most beautiful. This may often be the final show for the short-lived perennial, but the striking beauty and long-lasting blooms are worth the effort.
Taller varieties may require staking, especially when planted in areas with heavy rain or wind. Stems are hollow and break easily under this type of stress.
Some diseases and insect pests may attack Delphiniums, keep an eye on young plants, and ensure soil conditions are right for the plant when planting Delphiniums. Delphiniums may be propagated from seed or basal cuttings; however, they don't propagate from diseased plants.
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