English Delphiniums - Knowledgebase Question

Bay City, Mi
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Question by tomdclements
January 15, 2010
I came across some very vague information about English Delphiniums. I cannot find any species information about them and contacted some local nurseries about them and they nor there suppliers give any information more than what I had. There is a Enlish Delphinium club in Alaska, but not much information. I know thet're not Larkspurs. Have you any information about them? Only information I could get was on the internet

Answer from NGA
January 15, 2010
English Delphiniums are Delphinium elatum, the most commonly grown delphiniums. Delphinium's majestic bloom spikes are a mainstay of many summer gardens. Flower color covers the full range of blues and purples, and you'll find cool pinks, cream, and white as well. Individual blooms are flat, to 2 inches across, borne in narrow, upright spikes. Leaves are dark green and deeply lobed. The tall-growing cultivars of D. elatum are most widely grown; they form 1- to 2-foot-wide clumps and send up 5- to 6-foot flower spikes.

Delphiniums prefer cool, moist summers and chilly but not excessively cold winters. They need rich, porous, nonacid soil; if soil is acid, amend it to neutral before planting. Also work in organic matter and a high-phosphorus fertilizer. When new shoots appear in spring, remove all but the two or three strongest and apply a complete fertilizer. Stake flower stalks early. Cut back stalks after bloom, leaving foliage at the bottom; when new stalks emerge, fertilize again to encourage fall bloom.

Even under ideal conditions, delphiniums are usually short lived; dividing them each year in spring may prolong their lives. If grown outside their preferred climate, they're best treated as annuals. Plant in fall in mild-winter zones, and just after frost danger is past where summers are hot.

Besides cultivars of D. elatum, tall delphiniums include the Pacific Hybrids, with flower spikes up to 7 feet.

Hybrids of D. belladonna, such as 'Bellamosum', are somewhat hardier and less prone to disease than other delphiniums. Don't pinch or disbud these; just let them grow as they will. Their blossom spikes are shorter but more numerous than those of D. elatum.

Chinese delphinium (D. grandiflorum) is somewhat more forgiving of less-than-ideal conditions than D. elatum, though it does have the same soil and climate needs. It's a many-stalked plant that grows just 1 1/2 to 2 feet tall, bearing flowers in blue shades.

Hope this information sheds some light on the plant!

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