Re: Washingtonia robusta growth in the Little Rock suburbs
Jeremy, I just cut off the fronds of the Robusta in early winter and then cover the entire palm with a tarp. Occasionally during the winter during warm periods, I loosen the tarp to allow any moisture to get out away from the palm. It normally gets 12*F to 15*F most winters. Good luck on your filifera. They are supposed to be a little more cold hardy than robustas.
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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
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