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Delphinium glaucum

Common name:	Giant Larkspur	Family:	Ranunculaceae
Author:	S.Watson.	Botanical references:	60, 270
Synonyms:	Delphinium brownii (Rydb.)
Known Hazards:	All parts of the plant are toxic[172]. The plant is most toxic when it is young[200].
Range:	Western N. America - Alaska to California.
Habitat:	Sub-alpine to alpine meadows and streambanks[60]. Meadows, wet thickets, bogs, streamsides and open coniferous woods from sea level to 3200 metres[270].
Edibility Rating (1-5):	0	Medicinal Rating (1-5):	0

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	D. scopulorum[B] D. scopulorum auct. non[P] D. scopulorum var. glaucum[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Sierra Larkspur [P], Tower Larkspur [B],
Epithets:	From a Dictionary of Botanical Epithets
	glaucum = glaucous;
Systematics:	From a USDA Plants Database
	Order: Ranunculales. Buttercup family

Physical Characteristics

Perennial growing to 1.8m. . It is in flower from July to August. The flowers are hermaphrodite (have both male and female organs). We rate it 0/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and requires well-drained soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires moist soil.

Habitats and Possible Locations

Cultivated Beds.

Edible Uses

None known

Medicinal Uses

Disclaimer

None known

Other Uses

Parasiticide.

A parasiticide is obtained from the leaves[172]. It is quite toxic and so is for external use only.

Cultivation details

Prefers a rich moist but well-drained soil[187] and dislikes water-logged soils[200]. Requires an open sunny position[188].
This species is hardy to about -20°c[187].
A very variable species, it is divided by some botanists into several closely related species. Apparently because of rather recent and/or incomplete genetic isolation, the degree of differentiation between these species is not such that they can be consistently recognized. Specimens named Delphinium splendens represent plants grown in high-moisture, low-light conditions and may occur as sporadic individuals anywhere from California to Alaska. Type specimens of D . brownii Rydberg, D . canmorense Rydberg, and D . hookeri A. Nelson represent plants grown on relatively dry sites at high latitudes. Plants from dry sites at low latitudes are represented by D . bakerianum Bornmüller and D . occidentale var. reticulatum A. Nelson. Plants with lavender to white flowers are represented by type specimens of D . brownii forma pallidiflorum B. Boivin and D . cucullatum A. Nelson. Type specimens of D . alatum A. Nelson and D . glaucum var. alpinum F. L. Wynd (an invalid name) represent plants growing above or near treeline[270].
Hybridises in the wild with Delphinium brachycentrum to form the hybrid D. x nutans[270].
A greedy plant, inhibiting the growth of nearby plants especially legumes[54].

Propagation

Seed - sow March/April in a cold frame or May outdoors[111]. Keep moist and in a shady position until germination takes place[175]. The seed has a limited viability so it should be stored in a sealed container at about 3°c[200]. Temperatures above 15°c inhibit germination[175]. The seed usually germinates in 2 - 9 weeks at 15°c[175]. When they are large enough to handle, prick the seedlings out into individual pots and plant them out into their permanent positions in the summer.
Cuttings of basal shoots in April/May, taken before they become hollow at the base, and planted in a cold frame[111].
Division in spring[111] or early autumn[200].

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[C] Taxon data. from the CalFlora database.
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for the family Ranunculaceae.

[CHINA] Data Very detailed botanical/identification info. from the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[54] Hatfield. A. W. How to Enjoy your Weeds. Frederick Muller Ltd 1977 ISBN 0-584-10141-4
Interesting reading.

[60] Hitchcock. C. L. Vascular Plants of the Pacific Northwest. University of Washington Press 1955
A standard flora for Western N. America with lots of information on habitat etc. Five large volumes, it is not for the casual reader.

[111] Sanders. T. W. Popular Hardy Perennials. Collingridge 1926
A fairly wide range of perennial plants that can be grown in Britain and how to grow them.

[172] Schofield. J. J. Discovering Wild Plants - Alaska, W. Canada and the Northwest.
A nice guide to some useful plants in that area.

[175] Bird. R. (Editor) Focus on Plants. Volume 5. (formerly 'Growing from seed') Thompson and Morgan. 1991
Very readable magazine with lots of information on propagation. A good article on Corydalis spp.

[187] Phillips. R. & Rix. M. Perennials Volumes 1 and 2. Pan Books 1991 ISBN 0-330-30936-9
Photographs of over 3,000 species and cultivars of ornamental plants together with brief cultivation notes, details of habitat etc.

[188] Brickell. C. The RHS Gardener's Encyclopedia of Plants and Flowers Dorling Kindersley Publishers Ltd. 1990 ISBN 0-86318-386-7
Excellent range of photographs, some cultivation details but very little information on plant uses.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[270] Flora of N. America 0
An on-line version of the flora with an excellent description of the plant including a brief mention of plant uses.

Readers Comments

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Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
WEB search engine by Rich Morris - Home Page- Contact Info
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