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Alkanet

Anchusa azurea (an-CUE-sah ah-ZUR-ee-ah)

Family: Boraginaceae Non-native Vine (vertical)

Anchusa azurea , or Alkanet, is a flowering, bristly, short-lived, perennial. In its native Europe, it is often found on the sides of arable fields, waste places, roadsides and stony hills. The small, bright blue flowers of Alkanet are borne in loose clusters or cymes from late spring to mid-summer. The plant will grow best in full sun, but you should provide some afternoon shade during the hot summer months, and it tolerates heavy clay soil. It prefers moist, well-drained, soil, but established plants will tolerate drought. Some taller plants may need to be staked for support. This plant is not drought tolerant and mulching around the plant base will aid in retaining moisture. The mulch will also provide protection for the plant after the bloom season has ended. Cut back the plants at the end of the season and assure that the roots (but not the crown) are protected by mulch. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees. This plant will self-seed and has a reputation for being weedy. Under the right conditions such as deep, rich, fertile soil, it can become invasive. Self-seeding, if not dealt with, can also lead to an invasion of new plants. Deadheading will help to eliminate this tendency as well as prolong the bloom period. Use the plant along walkways and slopes or in naturalized areas. Insects, Diseases and Other Plant Problems: No significant problems; however, crown rot is an issue for this plant.

Source: NC State Extension Gardener Plant Toolbox ↗ NC State Extension Gardener Plant Toolbox, 53 attributes.

How it fits the guild

Guild layer 6 - Vine (vertical) Optimal soil pH Acid (<6.0); Alkaline (>8.0); Neutral (6.0-8.0)
See companions & conflicts ↓

Companions & Conflicts

Curated pairwise relationships between this plant and others in the library — who feeds whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.

No curated interactions recorded for this species yet.

Also noted by NC State

Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.

Full plant profile

Growing Conditions
Plant type
Perennial
Life cycle
Perennial
USDA zones
3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
Light
Full sun (6 or more hours of direct sunlight a day) | Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Soil texture
Clay; Loam (Silt); Sand
Soil pH
Acid (<6.0); Alkaline (>8.0); Neutral (6.0-8.0)
Soil drainage
Good Drainage | Occasionally Wet
Available space
12 inches-3 feet; 3 feet-6 feet
NC region
Coastal; Mountains; Piedmont
Mature size
Height: 3 ft. 0 in. - 5 ft. 0 in. | Width: 1 ft. 0 in. - 2 ft. 0 in.
Growth rate
Rapid
Maintenance
Low
Canopy layer
6 - Vine (vertical)
Form & Appearance
Habit / form
Climbing; Erect; Spreading
Texture
Coarse
Leaf color
Green
Leaf arrangement
Alternate
Leaf shape
Elliptical; Linear
Leaf margin
Entire
Leaf feel
Rough
Leaf size
3-6 inches long
Hairs present
Yes
Leaf detail
Straight, lance-shaped, leaves.
Flower color
Blue
Flower value
Showy
Flower form
Cyme
Flower shape
Tubular
Flower size
< 1 inch
Flower detail
Bright, violet, flowers bloom from June to August.
Bloom time
Spring; Summer
Fruit detail
Seeds ripen from July to September
Wildlife & Ecology
Native status
Non-native
Origin
East Central Europe, Caucasus to Mediterranean and Pakistan.
Distribution
Western Canada and United States, North Central United States
Wildlife value
Noted for attracting wildlife.
Attracts
Bees
Food & Medicine
Edible parts
Flowers
Harvest time
Fall; Summer

Edibility

The flowers can be eaten raw and make a decorative addition to the salad bowl, or used as a garnish.

Landscape Use
Landscape location
Naturalized Area; Slope/Bank; Walkways
Landscape theme
Cutting Garden
Design feature
Accent; Border; Small groups; Specimen
Garden tags
#blue flowers #flowers mid-summer #flowers late spring #herbaceous perennial #drought tolerant #clay soils tolerant #perennial #wildflower #weedy
Problems & Resistance
Disease problems
Phytophthora Root and Crown Rot in the Landscape
Resistant to
Compaction; Poor Soil
Particularly resistant to
drought
Propagation
Division; Root Cutting; Seed

Planted at Hunnicutt

Nobody’s planted this one yet.