Looking out the window a few mornings ago, we saw bright white shimmers in the lower yard...
They happen when the ground is warm/not frozen but the air is very cold. The sap in the plants expands in the freezing cold and comes out thru cracks in the plant stems.
They are incredibly delicate.
I've never seen them this tall.
The other name for them is "ice ribbons". What a treat it was to see them in our own yard!