Zebrinas are a little difficult to grow sometimes (at least for me). They seem to suffer from rot problems. One winter mine rotted in the garage, and they were even bareroot. I never got anymore. I hope you have great luck with yours. I don't want to discourage you from growing them though.
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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