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PlantFiles: Delphinium
Delphinium requienii

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Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Delphinium (del-FIN-ee-um) (Info)
Species: requienii (re-kwee-EN-ee-eye) (Info)

Synonym:Delphinium staphisagria var. requienii

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2 members have or want this plant for trade.

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Category:
Perennials

Height:
36-48 in. (90-120 cm)

Spacing:
9-12 in. (22-30 cm)

Hardiness:
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Danger:
Parts of plant are poisonous if ingested

Bloom Color:
Light Blue
Silver/Gray

Bloom Time:
Mid Summer

Foliage:
Herbaceous

Other details:
This plant is attractive to bees, butterflies and/or birds

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

Patent Information:
Non-patented

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
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
Allow seedheads to dry on plants; remove and collect seeds

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Profile:

1 positive
1 neutral
No negatives

Gardeners' Notes:

RatingAuthorContent
Neutral Mitchella On May 16, 2013, Mitchella from Pownal, ME (Zone 5b) wrote:

I wonder about the zone 4a rating. I grew these from robust seedlings in Buckfield, Maine (zone 4b at the time) and lost all - about a dozen - over the winter. But I'm trying again now that I'm in zone 5b (they are easy to grow from seed). The foliage alone is beautiful, glossy and divided, as you can see in one of the photos.

Positive otter47 On Apr 9, 2012, otter47 from Livermore, CA wrote:

This looks very much like a species delphinium that another member of my garden club passed on to me. It has thicker leaves than most other delphiniums and seems much more resistant to snail attacks. It also self seeds and comes up in unusual spots so it persists as a perennial in that aspect. The varieties of delphinium that are derived from Delphinium elatum and D. grandiflorum are at best short-lived perennials in my garden, although I adore them for their blue flowers.

Regional...

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

Fremont, California
Livermore, California
Salt Lake City, Utah



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