Hi, Erland. I just saw this post and wanted to show you a few pics. I am growing three different types of wagnerianus here in Arkansas Zone 7b. They suffer no winter damage and are growing nicely. I just started 100 seeds myself from a Canadian strain, and I'm waiting on them to germinate. To see the waggies that I'm growing, click here:
Waggies
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Austin
Arkansas River Valley
Average January Low: 31°F, Average August High: 92°F
Extreme Winter Lows: 5-15°F, Extreme Summer Highs: 100-112°F, Annual Precipitation: 52 inches