February’s full moon this coming Sunday corresponds to the ancient Celtic festival of Imbolc, which celebrates the reawakening of the earth and new life. In the Old Farmer’s Almanac, it is the “Snow Moon,” and a cold spell in the forecast may bring a dusting of snow to Bay Area peaks at 4,000 feet.
Meanwhile, the warm spell has spurred new life. Reddish-barked arroyo willow is developing catkins and pollen, and water-loving willows abound along…