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Hardiness: 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)
Utterly delightful, but rather taller than I was expecting after growing other corydalis of more diminutive stature. Mine is about 2 1/2 ft. and magnificent, growing in rich soil with afternoon shade on a fairly sunny north side of the house (About 6 hrs full sun midday in summer.) It's increased in size at least 3x since it's purchase last spring. I love the scarlet hued stems and dotting on the leaves. The flowers are rich, intense TRUE cobalt BLUE! A hard to find colour indeed. Blooms June-Sept- If you like dicentras you'll love this plant. Does not self seed readily, (but I hope it will try this year.)
On May 30, 2007, karen_in_AK from Anchorage, AK (Zone 3b) wrote:
I added this plant to my garden a couple of years ago (in 2004), and it's made it through the winter successfully every year since. A truly lovely plant, it's foliage is as attractive as the flowers. I successfully propagated a couple of plants this year from it's seed - which made me very happy since it was a "one time deal" from the nursery I originally got it from.
On Jun 13, 2006, JenniferE from Lebanon, PA (Zone 6a) wrote:
I tried (unsuccessfully) a few times to grow various Corydalis flexuosa varieties. I had almost given up on ever having the blue flowers of Corydalis until I tried elata. I am thrilled! I planted mine last year, and it survived and is now blooming. I am always in search of hardy perennials with truly blue flowers. (My definition of blue is significantly narrower than the one used by many catalogs and books.) I have found a winner here!