Bob3

It grows well (for the most part) into "zone 9".
Where are you located?
My mat of Blue Java gets hit pretty hard by frost but my "other mat" at a buddy's place that is a few miles away but about 100' higher in elevation will very often winter over un-protected with little or no p-stem damage. (just frost-bit leaves)

Leaves will get damaged & die off after short exposure to as little as a degree or two below freezing (C or F) but the p-stems can manage maybe an hour or two of very light frost without being damaged.

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