Two other Northfield bloggers have already put up photos of today’s hoar frost here and here, but I couldn’t resist taking a few, too. Hoar frost forms when plants (or cars or whatever) are colder than the air. Moisture in the air forms crystals on the objects. It has seemed very moist recently (for January, at least) and the crystals were especially large and lovely. It is days like today that remind me why I try not to have too clean a garden at the end of the year. The frost-covered plants provide real interest and beauty.