Larkspur (Consolida ajacis) Seeds

• Larkspur
• The Larkspur Plant
• How to Sow Larkspur
• How to Grow Larkspur
• Growing Tips for Larkspur
• Diseases and Pests of Larkspur
• Uses and Curiosities of Larkspur

Larkspur

Larkspur (Consolida ajacis), also known as Rocket Larkspur, is an annual herbaceous plant belonging to the Ranunculaceae family, the same as Delphinium, with which it is often confused due to the similarity of the flowers. It is native to Eurasia but is now widespread and cultivated in gardens around the world.

The common name comes from the distinctive shape of the flower, which has a small backward-pointing spur resembling a knight's spur, while the related genus Delphinium takes its name from the dolphin-like shape of the unopened flower bud.

The Larkspur Plant

Larkspur grows with upright, slender yet sturdy stems that can reach up to a metre in height, making it perfect for adding vertical structure to mixed borders. The leaves are finely divided, light green in colour, which makes the flowers stand out even more.

The flowers bloom clustered in long, dense spikes, in shades of deep blue, pink and pure white, often available in colourful mixes too. Each individual floret, seen up close, reveals a delicate and intricate shape, with slender petals and the characteristic spur clearly visible.

Flowering is generous and long-lasting, able to turn an entire border into a wave of colour for several consecutive weeks between late spring and summer.

How to Sow Larkspur

Larkspur is best sown in autumn in mild climates, or in spring, from March to April, in colder areas. Seeds should be scattered or sown in rows and covered lightly with fine soil, as they need a degree of darkness to germinate evenly.

Germination usually takes 15-20 days, with an optimal temperature range of 10 to 15 degrees: excessively high temperatures can inhibit germination, which is why autumn or early spring sowing gives better results than sowing in summer.

How to Grow Larkspur

This plant prefers fertile, well-drained, light soil in full sun, a condition that encourages more abundant flowering and sturdier stems. It dislikes transplanting, which is why direct sowing outdoors is always preferable to starting in trays and transplanting later.

Watering should be regular during the growth phase, keeping the soil moist but never waterlogged. For taller varieties, it is advisable to provide light staking to support the flowering stems, especially in windy or rainy conditions.

Growing Tips for Larkspur

Regularly removing spent flowers helps prolong flowering and keep the plant looking tidy. Larkspur is also excellent as a cut flower for arrangements, thanks to its long, straight stems that last well in a vase.

It is worth noting that all parts of the plant, including the seeds, contain alkaloids and are toxic if ingested: it should therefore be handled with gardening gloves and kept away from young children and pets who might chew on its parts.

Diseases and Pests of Larkspur

Larkspur is generally a hardy, low-maintenance plant, but it can occasionally be affected by powdery mildew in more humid periods, recognisable by the typical whitish coating on the leaves: good air circulation between plants helps prevent it.

Among the most common pests, aphids tend to concentrate on the youngest flowering tips and can be kept under control with natural potassium soap treatments or a simple jet of water.

Uses and Curiosities of Larkspur

In the language of flowers, Larkspur symbolises lightness and an open heart, and is traditionally considered a lucky flower to give on important occasions. Its tall blue spikes have been a fixture in English-style gardens and cottage gardens for centuries.

In the past, a natural blue dye was extracted from the petals of some Larkspur varieties and used on a small scale to dye fabrics, a use that has now fallen out of practice but reflects this plant's long history alongside humans.