Re: Growing Windmill palms in zone 6?
My tallest potted Trachycarpus is a T. fortunei about 2ft of trunk with leaves reaching up to about 4ft. The Butia Capitatas are potted as well, those I've never measured the trunks alone, but the fronds reach up to about 4½ft. I also have a Trachycarpus wagnerianus in-ground which is only about 5-6 inches tall. That one I don't protect except for mulch and freezepruf spray. Needle palm doesn't get any protection at all.
I don't know if these palms would store well in darkness, so I'd make sure they get SOME light during winter just in case... unless someone else has had experience with dark overwintering.
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