What is Hoar Frost?
Cow Parsley, Wild Chervil, Wild Beaked Parsley, Keck… call it what you will, it looks great covered in frost! And this is Hoar Frost. Water crystals in the air which is below freezing. In this case there was a breeze from the right to left of the photo, making the frost stick to the left hand side of the plant. Cool. (Literally).