Delphinium plants can be either hardy or half hardy perennials.
Delphinium are very variable in height, depending on the variety. They can grow anything from 15 cm (6 inches) to over 2 metres (6 feet) in height.
They bloom with tall spires with flowers of blue, pink, purple, yellow, or white.
The timing of flowering is variable between species of Delphinium, and can be anything from the end of spring to autumn.
Tall Delphiniums photograph by cacophonyx.
Larkspurs - Delphinium, Huntington Library Gardens by DominusVobiscum.
When growing Delphinium outdoors from seed, they should be sown either at the beginning of spring or the beginning of autumn. Once sown, simply cover the seeds with topsoil.
The spacing will depend upon the variety (small species about 40 cm (16 inches) apart; large ones about 80 cm (32 inches) apart).
They can grow in either a sunny or lightly shaded location of the garden. This area should have good drainage.
The soil should be rich, deep, and have a slightly acidic to neutral pH of 5.5 to 7.
Once growing, Delphinium plants should be fed with fertilizer at the beginning of spring.
Taller varieties of Delphinium should be staked.
As soon as the first bloom is over, the flowers should be cut off. This will result in further growth. Once the new growth has reached about 20 cm (8 inches) then the old growth should be pruned off.
If you require more Delphinium plants, then they can be propagated by division. This can be carried out in the spring.
The Delphinium genus has around 300 species currently.
Yes, Delphinium are popular in gardens for their tall spires of colorful flowers and are excellent for adding height to borders.
The Delphinium elatum (Larkspur) is a favorite species among gardeners for its vibrant blue flowers.
Most Delphinium species are not notably fragrant but are prized for their visual appeal.
Delphinium plants thrive best in a location with full sun or partial shade and well-drained, fertile soil.
Currently, Delphinium is not considered invasive in the USA.
To remove Delphinium plants, dig them up, ensuring to get all the root system to prevent regrowth.
The Delphinium genus comprises around 300 species of perennial flowering plants, native to the Northern Hemisphere. Known for their tall, showy spikes of colorful flowers, delphiniums are a favorite in cottage gardens and formal flower beds.
Delphiniums prefer cool summers and moist, well-drained soil in a sunny location. They can be grown from seeds or young plants and should be planted in spring. As tall plants, they often require staking to support their flower-laden stalks. Regular fertilizing and deadheading spent flowers will encourage repeat blooming.