
trefle.io · Taken May 21, 2018 by Marcos Rivas Campoamor (cc-by-sa)
Boraginaceae
Hound's-tongue
Cynoglossum officinale
Also known as Cynoglossum officinale subvar. bicolor, Cynoglossum album, Cynoglossum officinale var. corsicum, Cynoglossum officinale var. areolatum
Native Plants · Edibles & Herbs · Wildflower · Biennial · Medicinal Herb · Boraginaceae · Toxic · Pollinator · Bur Fruit · Woodland Edge · Naturalized · European Native
Hound's-tongue is a biennial to short-lived perennial grown for its deep reddish-purple flowers and historical medicinal use, though it contains toxic alkaloids and should be handled with care. It prefers well-drained soils in full sun to partial shade and requires minimal watering once established. Note that it can spread readily by seed via bur-like fruits that cling to clothing and animal fur, so deadheading is recommended to prevent unwanted spreading.
Growing conditions
The details behind the basics
- Daily light
- 6 hours
- Watering
- Water moderately; allow the top inch of soil to dry between waterings · Every 7-10 days
- Maintenance
- Moderate
- Soil
- loam
- Soil pH
- 7–7.5
- Temperature
- -25°F to 85°F
- Cycle
- Perennial
- Propagation
- Seed
Hardiness
USDA 4b-9b
Form & growth
Mature size and habit
- Mature height
- 12 in – 3 ft
- Spread
- 2 ft
- Spacing
- 18 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- No
- Foliage
- Medium
Ecology & origin
Where it belongs and what it brings
- Native to
- Alabama, Albania, Alberta, Altay, Arizona, Arkansas, Austria, Baltic States, Belarus, Belgium, British Columbia, Bulgaria, California, Central European Rus, Colorado, Connecticut, Corse, Czechoslovakia, Delaware, Denmark
- Attracts
- Bees, Butterflies, Moths
Sources: trefle, usda
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