Viewing post #1052515 by sooby

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Feb 6, 2016 9:14 AM CST
Name: Sue
Ontario, Canada (Zone 4b)
Annuals Native Plants and Wildflowers Keeps Horses Dog Lover Daylilies Region: Canadian
Butterflies Birds Enjoys or suffers cold winters Garden Sages Plant Identifier
I found a study that listed Hemerocallis 'Joan Senior' as significantly damaged when the growing medium went down to 15F. The link is here (around 200 pages, an MSc thesis:

https://vtechworks.lib.vt.edu/...

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