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Boraginaceae FAMILY

Onosma argentata

Onosma argentata

Edibility
0/5
Medicinal
2/5

Safety & Hazards

None known

Cultivation Details

HabitPerennial
Growth—

Species in this genus generally require a sunny position in a well-drained soil[1, 2]. Prefers a deep rather rich sandy loam[1]. Tolerates hot dry conditions and also drought once it is established, but dislikes moist climates at any time of the year[3, 4]. Species in this genus tend to grow well in crevices in a rock garden or on a wall[1, 2].

Propagation

Seed - we have no information on this species but suggest sowing the seed in a greenhouse in early spring. Prick out the seedlings into individual pots as soon as they are large enough to handle and grow them on in the greenhouse for at least their first winter. Plant them out in early summer. Cuttings in a frame in the summer. Shade them for the first 10 - 12 days[1]. Cite as: Temperate Plants Database, Ken Fern. temperate.theferns.info. 2026-02-21. <temperate.theferns.info/plant/Onosma+argentata>

Pollinators

Insects

References

  1. [1]RHS Dictionary of Plants plus Supplement. 1956 — F. Chittendon. · Oxford University Press · 1951 · ISBN - ↩︎Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaced in 1992 by a new dictionary (see [ 200 ]).
  2. [2]Perennials. Volumes 1 and 2. — Phillips. R. & Rix. M. · 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.
  3. [3]The Dry Garden. — Chatto. B. · Dent · 1982 · ISBN 0460045512 ↩︎A good list of drought resistant plants with details on how to grow them.
  4. [4]The New RHS Dictionary of Gardening. 1992. — Huxley. A. · 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.
  5. [5]Novitiae Florae Anatolicae IX — Huber-Morath von A. · 1971 ↩︎
  6. [6]Onosma L.: A review of phytochemistry and ethnopharmacology — Kumar N,. Kumar R. & Kishore K. · 2013 · http://10.4103/0973-7847.120513 ↩︎
  7. [7]Naphthoquinones from the Roots of Onosma argentatum Hub.-Mor. (Boraginaceae) — Özgen U. et al · 2004 ↩︎