Making funky and fun garden art is a knack. I'm always finding things that can be taken to the next level, or designing something from scratch.
There are lots of ways that the hypertufa hands can be displayed, depending on what you use to form them, either draped over a round item such as a bottle, or inside a plastic plant pot.
As they weather, the moss will grow in the crevices, and eventually, in time, lichen could be happy there too.
These don't need any special winter care, except to keep them dry if possible. There is nowhere for water to collect, which could freeze and crack, but they could break if they are immersed in water.
Think whimsy; display them in a small terracotta pot, with a handful of plants like a bouquet, or group them in a tray.
Make your own, and see what happens!
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