Delphinium, also called larkspur, is an amazing plant that blooms from June to October.
Key Delphinium facts
Name – Delphinium
Family – Ranunculaceae
Type – perennial or annual
Height – 20 to 60 inches (50 to 150 cm)
Exposure – full sun
Soil: ordinary, well drained – Flowering: summer → mid-fall
Sowing or planting are the only things to actually do for this plant, because delphinium require absolutely no care at all.
Sowing and planting delphinium
For perennial and hardy delphinium species
Perennial and biennial larkspur species can be sown in spring and summer, preferably under a cold frame if early in spring.
It is best to plant delphinium seedlings from their nursery pot to the ground in September. This gives the plantlings time to properly develop their roots before winter. They’ll grow back stronger in the following spring.
- Delphinium loves rich soil, feel free to amend it when planting with fertilizer or compost.
- It loves emplacements that receive a lot of sun.
- Avoid spots where the wind howls through, or else, simply stake the plant.
- Keep a distance of 16 inches (40 cm) between plants.
→ Propagate perennial delphinium through crown division in spring.
Sowing annual delphinium cultivars
When sowing from seed, prefer sowing in fall or until spring while avoiding frost spells.
Enrich the soil with special flower plant soil mix and granulated organic fertilizer to enhance the blooming and make it more dense.
- Expect to wait at least 4 weeks before being able to transplant to the ground.
Care for Delphinium and pruning
For perennial delphinium, cut back to the shortest in fall and, if needed, protect the base in colder areas.
- Delphinium don’t stand to the wind well if not staked.
Learn more about delphinium, larkspur
Its great height, often taller than 3 feet (1 meter), makes it a good plant to settle at the back of a flower bed where it will produce an nice bushy backdrop.
Some varieties are particularly tall and colorful, such as the beautiful Pacific Giant Delphinium.
It also makes for great bouquet flowers that will keep for a long time – even a bouquet of dried flowers!
Smart tip about delphinium, larkspur
- Cut a few delphinium flowers off the bush in summer, and set them in a vase: you’ll be surprised at how long they last in such a bouquet!