Because actual planning this moment may be too daunting. Whether you have a plot of earth or a balcony (or not) though, few things beat the pleasure of flipping through seed & nursery catalogues while lounging in your pjs. The catalogues are usually free (or very low cost). We pore over the lovely White Flower Farm offerings that arrive regularly.
Read this Washington Post article for a seed catalogue review. Check in with Martha Stewart for some ideas. And then click over to Terrain for some serious staring.
Then repeat (to yourself): Spring is 6 weeks away. (Give or take:)
ciao-flowery-meow/GG's gardener
(lovely photograph by Le Portillon)