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Showy spikes and beautiful blooms make growing delphinium worth the challenge.

DelphiniumsSunlight: Full sun to partial shade
Maturity: 85-125 days from seed to flower
Height: 2 to 6 feet
Spacing: 12 to 36 inches apart in all directions

Native to England, home flower gardeners are growing delphinium — also known as larkspur — for their beautiful feathery leaves and tall spires of blossoms that bloom all summer long. Available in almost every color, they add grace to borders and are spectacular when planted along a stone wall or garden fence.

Delphiniums can be difficult to grow even under the best of conditions. However, both tall and short varieties have long been a favorite in cottage-type gardens, mixed perennial beds and floral bouquets. Impressive plants with showy single or double flowers, they grow up to 6 feet tall. This short-lived perennial always draws compliments.

Tired of the same old flowers? Heirloom flower seeds — the ones that Grandma used to grow — add charm to your garden while stirring memories with their abundant blossoms and arousing scents. Best of all, we ship them FREE!

Quick Guide

  • Delicate blue, pink, white or purple flowers will be a highlight of your garden
  • Need rich soil and full sun to part shade; prefer cooler climates
  • Grows well from nursery stock or division; sowing seed requires some attention
  • Provide consistent water and support for tall varieties
  • Expect blooms in midsummer

Site Preparation

These “needy” plants do best in sunny locations with rich, well-drained soil. Prior to planting, work a couple shovelful of organic compost and a dry fertilizer into the soil. This helps condition the soil, which improves drainage and will keep roots cool (watch our video ).

Delphiniums are one the first perennials to show new growth in the spring and can tolerate some frost. Large varieties will require support and protection from the wind. Plants do not like hot weather and dry conditions.

How to Plant

May be propagated from divisions or from seed. If planting from seed, sow outdoors two weeks before the last frost, just beneath the soil surface (see Sowing Seeds Directly In the Garden). Seeds will germinate in 14-21 days.

Tip: Chill delphinium seed for a 1-week period prior to planting to improve germination by putting them in the refrigerator. Read our article How to Stratify Seeds and Improve Germination here.

If propagating by division, separate clumps every 2-4 years in early spring. Delphinium will benefit from the cool, wet weather and be well established before the heat of the summer kicks in.

Water well throughout the gardening season and feed with a liquid flower fertilizer to keep plants strong and productive. Pinch off the faded blossoms to extend the flowering season. Mulch to prevent weeds, conserve moisture and improve aesthetics.

Most perennial flowers benefit from division as they get older and begin to lose vigor, plus you get more plants to spread around the garden or share with friends.

Insects and Disease

Slugs and aphids will occasionally attack delphinium. Watch closely and apply diatomaceous earth or other OMRI listed pesticide if aphids are found.

Large irregular holes in foliage and partially eaten seedlings are signs of slug damage. Scatter Sluggo®, an organic iron phosphate bait, around plants to kill slugs and snails without harming people, pets or wildlife.

The leaves and stems of plants are also susceptible to attack by powdery mildew, rust and gray mold. To reduce common plant diseases found on delphinium:

  • Avoid overhead watering whenever possible (use soaker hoses or drip irrigation)
  • Properly space plants to improve air circulation
  • Apply copper and sulfur sprays to prevent further infection

Seed Saving Instructions

Not available

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