Delphinium fissum: complete guide

Overview

Delphinium fissum, also known as Split Larkspur or Pied-d'alouette fendu in French, is a graceful border plant originating from Southern Europe through Crimea. This member of the Ranunculaceae family is valued for its deep blue flowers that make striking statements in summer gardens. The plant is native to Albania, Bulgaria, Cyprus, France, Greece, Italy, Crimea, Lebanon-Syria, Palestine, Romania, Spain, Turkey, and Yugoslavia.

This larkspur is a classic garden plant that can thrive for decades. It forms an upright plant with elegantly cut foliage and stately flower spikes filled with heavenly blue-tinted blooms. The plant flowers from June through August and is a favorite of garden enthusiasts and bees alike.

Appearance and Bloom

Delphinium fissum forms an upright, compact plant with deeply cut, palmate-pinnate leaves. The foliage is attractively shaped and provides elegance even when the plant is not flowering. However, the main attraction is undoubtedly the flower spikes.

The flowers are medium to large, vivid blue blooms, densely arranged in impressive, nearly upright spires. Each bloom has a characteristic structure with dark sepals (spurs). The plant reaches heights of 60-90 centimeters, making it a medium-height larkspur.

The blooming period runs from June through August, perfectly aligning with summer. The flowers remain attractive for extended periods and produce seed if not deadheaded.

Ideal Location

Delphinium fissum grows best in sunny locations receiving at least 6-8 hours of direct sunlight daily. Full sun is recommended for best flower production. In hot climates, some afternoon shade can be tolerated, though this may shorten the blooming period.

The plant is somewhat wind-sensitive, so plant it in a sheltered location or support it with stakes. Good air circulation also helps prevent fungal diseases.

Soil

Delphinium fissum thrives best in moderately fertile, well-draining soil. Moderately humus-rich garden soil is ideal. The plant can handle various soils provided they drain well.

A pH range of 6.0-7.0 is recommended. Add compost when planting to improve soil structure. Good drainage is important; the plant cannot tolerate waterlogging.

Watering

The plant needs regular watering, especially during the growing season and flowering period. Ensure the soil stays moist but not waterlogged. Water when the soil surface feels dry.

During dry periods, daily watering may be needed. In autumn and winter, watering can be reduced. Avoid watering foliage, as this promotes fungal diseases.

Pruning

Dead or spent flower spikes can be removed to keep the plant tidy and promote possible repeated blooming. After the flowering period, plants can be cut back to about 20 centimeters above ground.

In spring, dead or damaged parts can be removed. Regular removal of dead leaves helps with disease control.

Maintenance Calendar

March-April: Soil preparation; feeding; young plants can be planted.

May-June: Regular watering; place support stakes for tall plants.

July-August: Enjoy flowering period; remove spent flowers; regular watering.

September-October: Cut back after flowering; stop feeding.

November-February: Winter care; minimal activity needed in most regions.

Winter Hardiness

Delphinium fissum is reasonably hardy and can withstand winters with frost periods (approximately USDA zones 5-8). In severely cold regions, a light mulch layer can help. In very mild regions, the plant can grow almost year-round.

The plant typically regrows from seed or remaining roots even after frost.

Companion Plants

Delphinium fissum combines well with other summer bloomers:

• Lychnis (Campion)
• Geranium (Cranesbill)
• Alchemilla (Lady's Mantle)
• Salvia (Sage)
• Lupinus (Lupine)

This plant grows well in cottage gardens, flower borders, and cut flower gardens.

Closing Thoughts

Delphinium fissum is a classic garden plant that brings much joy annually. The tall blue flower spikes and easy growth make it a top choice for the front of borders. Choose a sunny spot and provide regular water, and you will enjoy years of blooms.

Seeds can be ordered online, or potted plants can be purchased at garden centers. Visit gardenworld.app for more suggestions and designs.

With minimal care, this is a plant that can thrive for decades and return fresh each year.