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Hardiness: USDA Zone 3a: to -39.9 °C (-40 °F) USDA Zone 3b: to -37.2 °C (-35 °F) USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F)
Sun Exposure: Full Sun
Danger: Handling plant may cause skin irritation or allergic reaction
Bloom Color: Medium Blue
Bloom Time: Mid Summer Late Summer/Early Fall Mid Fall
Foliage: Herbaceous
Other details: Average Water Needs; Water regularly; do not overwater
Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral)
Patent Information: Non-patented
Propagation Methods: By dividing the rootball From seed; sow indoors before last frost
Seed Collecting: Bag seedheads to capture ripening seed
On Apr 3, 2005, SalmonMe from Springboro, OH (Zone 6a) wrote:
Bloom can be prolonged with regular deadheading. Deadhead to lateral bud after flowers fade. Foliage becomes unsightly after blooming is finished, and plant will benefit from being cut down to the ground at this point. Plant only in spring. This plant requires staking in most cases and easily qualifies as a high-maintenance "fussy" plant.
On Nov 15, 2004, 8ftbed from Zion, IL (Zone 5a) wrote:
In zone 4/5 I found I needed to cut completely to the ground before snow. Those are the only ones to survive winter. The ones not cut at all and ones only cut to the basal clump apparently did not like the moisture trapped in the foliage that would then freeze/thaw.
I also discovered they respond to being cut back when flowers on the main stalks begin to fade. Cut all stalks to the ground and new flower stalks will be produced and bloom at a shorter heigth like delphiniums and centaurea montana.
The color of blue is irreplaceable.
On Aug 9, 2001, eyesoftexas from Toadsuck, TX (Zone 7a) wrote:
A brightly colored hardy herbaceous perennial with lance shaped midgreen leaves, rough and hairy stems, and large bright blue flowers simular to forget-me-nots displayed in large heads during midsummer.
Cultivation: Deep, fertile, well-drained soil in a suuny position is best. Anchusas need support from twiggy sticks. In autumn cut down to soil level.
Propagation: It is easily increased from stem rootings. These are best taken in winter, cutting roots in 2 inch long pieces. At the sem end of each cutting, make a flat cut at right angles to the stem, while at the root end form a slanting cut. Insert flat ends upwards in pots and put in cold frame.
Regional...
This plant has been said to grow in the following regions:
Rohnert Park, California Denver, Colorado (2 reports) Zion, Illinois Greenville, Indiana Van Buren, Indiana Lincoln, Nebraska Grove City, Ohio Springboro, Ohio Maryville, Tennessee Morgantown, West Virginia
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