Photo by Melody

PlantFiles: Tall Larkspur
Delphinium exaltatum

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Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Delphinium (del-FIN-ee-um) (Info)
Species: exaltatum (eks-all-TAY-tum) (Info)

7 vendors have this plant for sale.

3 members have or want this plant for trade.

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Category:
Perennials

Height:
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

Spacing:
12-15 in. (30-38 cm)
15-18 in. (38-45 cm)

Hardiness:
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Danger:
Seed is poisonous if ingested
All parts of plant are poisonous if ingested

Bloom Color:
Purple

Bloom Time:
Mid Summer
Late Summer/Early Fall

Foliage:
Herbaceous

Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Non-patented

Propagation Methods:
By dividing the rootball
From herbaceous stem cuttings
From seed; direct sow outdoors in fall
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Bag seedheads to capture ripening seed
Allow pods to dry on plant; break open to collect seeds

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By bemidjigreen
Thumbnail #1 of Delphinium exaltatum by bemidjigreen

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Profile:

3 positives
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive plant_it On May 20, 2013, plant_it from Valparaiso, IN wrote:

Tall Blue Larkspur thrives in shade too! Give it rich well-drained soil in light to medium shade and it will reward you with many years of brilliant blue flowers. Delphinium exaltatum it is an important mid-summer nectar source for hummingbirds with a much later bloom time than other Delphinium species. Hardy to Zones 4 - 7.

Tall larkspur is native to Eastern North America from Pennsylvania and Ohio south through the Appalachians into northern Alabama, with several small, isolated populations existing in the Ozarks in far south central Missouri. The Missouri populations are known to occur on wooded limestone slopes above the Jack's Fork and Current Rivers in Shannon and Howell Counties.

Tall larkspur typically grows 4-6' tall and features loose terminal racemes of gentian blue flowers which bloom in summer. Individual flowers (to 1" long) are complex and asymmetrical and feature five sepals, one of which is spurred into a distinctive prong resulting in the common name. Palmately divided, 3-5 lobed, deep green leaves. This species is taller, blooms later and has more abundant foliage than most other native U.S. larkspurs

Positive bemidjigreen On Jul 17, 2007, bemidjigreen from Blackduck, MN wrote:

As previously stated this is a very tall plant. Its in its second year in my garden is over 4 feet tall. It doesn't seem to be too fussy about soil--the bed its in has a lot of clay and this plant thrives.
The hardiness rating for this plant is not accurate--I live in zone 2b and its has overwintered two years here in the northeast corner of my house without any extra protection other than moderate snow cover. The flowers are small (1" each or less) but a lovely purple color. Even without blooms it is a very attractive plant--the foliage is much prettier than my pacific delphs. While not a show stopper its a very nice addition to a cottage garden.

Positive EdZ On Jul 3, 2006, EdZ from Gambrills, MD (Zone 7b) wrote:

2005 was my first experience with larkspur. I didn't plant it so I figure a bird deposited a few seeds in my garden.
This year it has reseeded itself and I have about a dozen beautiful plants.
The only problem with them is they grow quite tall,4-5 feet tall. They require staking or they will blow over. I'm collecting the seeds again this year and hope to have a garden full of these plants.
I would recommend these flowers to everyone.

Regional...

This plant has been said to grow in the following regions:

East Haddam, Connecticut
Valparaiso, Indiana
Gambrills, Maryland
Blackduck, Minnesota
Hudson, New Hampshire
Fairborn, Ohio
Leesburg, Virginia
Lexington, Virginia



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