Photo by Melody

PlantFiles: Corydalis
Corydalis curviflora var. rosthornii 'Blue Heron'

Family: Fumariaceae (foo-mar-ee-AY-see-ee) (Info)
Genus: Corydalis (kor-ID-ah-liss) (Info)
Species: curviflora var. rosthornii
Cultivar: Blue Heron
Additional cultivar information: (aka Heronswood Form)

30 members have or want this plant for trade.

View this plant in a garden


6-12 in. (15-30 cm)

9-12 in. (22-30 cm)

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)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Light Shade

Parts of plant are poisonous if ingested

Bloom Color:
Medium Blue

Bloom Time:
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Click thumbnail
to view:

By nifty413
Thumbnail #1 of Corydalis curviflora var. rosthornii by nifty413

By anglibet
Thumbnail #2 of Corydalis curviflora var. rosthornii by anglibet


No positives
2 neutrals
No negatives

Gardeners' Notes:

Neutral ColoradoLeo On May 7, 2014, ColoradoLeo from Longmont, CO wrote:

The image posted by anglibet is of Corydalis flexulosa "Blue Panda" - the item I searched for, and found this 'blue heron' entry instead.
I bought this "Panda" one (the second-pictured Corydalis), but it came with no 'instructions' to guide me, and didn't think to check... It did well for a while, but even with watering regularly, when summer full-sun severity overtook it, it dried up. I now know this plant would have done better in a shady, less arid, part of the garden.

Neutral nifty413 On Feb 17, 2006, nifty413 from Garland, TX (Zone 8a) wrote:

It's only been a few weeks since I received this plant from Heronswood, but I'm already impressed. What a marvelous, clear, brilliant blue!! Of course, the real test will be to see whether or not it survives a north central Texas summer!

Updated May 30, 2006: Thought it had entered "summer" dormancy toward the end of last month. Unfortunately, upon closer inspection, the roots have withered and are definitely no longer viable... not at all heat tolerant, it seems. :-(


This plant has been said to grow in the following regions:

Norristown, Pennsylvania

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