frost flowers

At last I have some more information. This sort of ice formation is called frost flowers (see link and Wiki), and is rare, and has never been reproduced in controlled laboratory conditions (according to the source). In fact, it seems highly likely to me that the critical factor is that it happens on water logged wood. Oh, the joy of science. We shall see.

Spot is yawning.

He wonders why there is no tag for calling a post boring