Care Of Delphinium Flowers: Tips For Growing Delphinium Plants

delphiniums
Image by Markles55

By Becca Badgett
(Co-author of How to Grow an EMERGENCY Garden)

Delphinium flowers beautify the summer garden with showy, spiky blooms on a tall, sometimes towering stem. Delphiniums 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. What are the secrets to the correct care of delphinium? Read more for tips about delphinium planting and how to get the best performance from growing delphinium plants.

About Delphinium Plants

One commonly thinks of delphinium plants (Delphinium) as having true blue flowers, which is 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 is normally at the back of the bed, where flower spikes can reach 2 to 6 feet tall. Delphinium flowers are often planted in masses or groups. Shorter varieties are useful in other areas of the garden.

How to Grow Delphinium

Grow delphinium plants in a sunny area with soil that is consistently moist. Don’t let them dry out. Mulch helps retain moisture and keeps roots cool. 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 care of delphinium that the gardener must get right for the showy blooms to appear. Gentle morning sun is preferable to the delphinium plants, which are picky about extreme differences in temperatures. Provide afternoon shade, especially when planted in hotter zones.

Special Tips for Delphinium Plants

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. Often, this may 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 disease and insect pests may attack delphiniums, keep an eye on young plants and when planting delphiniums, make sure soil conditions are right for the plant. Delphiniums may be propagated from seed or basal cuttings; however, don’t propagate from diseased plants.

Now that you’ve learned how to grow delphiniums, get started with delphiniums grown from seed, starting indoors in late winter. Add a few new delphinium plants each year, so you’ll always have the showy blooms in your yard.

This article was last updated on

Related Articles
Did you find this helpful?
Share it with your friends!
Additional Help & Information

Didn't find the answer to your question? Ask one of our friendly gardening experts.

Do you know anything about gardening? Help answer someone's gardening question.

Read more articles about Delphinium.

Search for more information

Use the search box below to find more gardening information on Gardening Know How: