Spring is coming; you can feel it, even here in Zone 5B where the intermediate witch-hazels were trying to bloom despite single-digit F temperatures that rolled the rhododendron leaves up tight as cigars as January wound down. Brrrr! But oh, the luxury of it: Fiat lux! (Let there be light!) Like this:On the last day of December where I live, the day was only 9 hours 16 minutes 18 seconds long; by January 31, it was 9 hours 57 minutes 20 seconds, and February 28 promises me an embarrassment of light: 11 hours 11 minutes 42 seconds. (Calculate your daylength for any day of any year here.)I’m stifling the urge to start ordering plants before I do some planning—reviewing the 2012 garden in my photo library and any notes, trying to match my purchases to what the garden really needs most–not sho