Japanese Iris
 

We have about 20 very large plants that I've been told are Japanese Iris.
They are about 40" in diameter and about the same height, with grass-like
"spiked" leaves. In the spring and summer, they have a typical iris-like
yellow or lavender flower.

Here in Las Vegas, I don't know what to do with the foliage now that it's
approaching winter. Should I cut it back or just leave it? If cut back,
what would be a desirable length?

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Tom Gauldin, Las Vegas NV
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