I got two of these included with asters in mixed baskets, fall 2018. I planted the entire clumps from the baskets, to winter over in ground. Everything survived. I divided the asters off the juncus, and planted the juncus clumps. On moving the juncus clumps a few weeks later (Eye roll at myself) I found good root growth out into the bed. They are still doing well, late May. I bought some dusty miller annuals and they look really great next to the blue juncus, total contrast in form and complementary in color. The rush are starting to make a few blooms now, too.
2022 spring. Still going strong, expanding clumps, some dieout in the middle. Looks like one can pry off some of the expanding root mass and replant/give away. Maybe they would look better if divided.

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