A few years ago, my seed collection had grown so much I was spending too much time sorting through them to find which ones to plant. Lacking cigar boxes, I bought a stack of cheap 9x12" manilla mailing envelopes, and labeled them for weeks before and after the last spring frost. When my seed orders come in, I note on the seed package when I want to plant them and put them in the corresponding envelope. For example, onion seeds go in the -14 weeks envelope and pole bean seeds go into the +2 weeks envelope. I keep a box with these envelopes in my cool basement.
Each week I take out the appropriate envelope and start planting the seeds for that week. Extra seeds go back into the envelope for next year. Seeds to be succession planted, like lettuce, get moved to the proper envelope for 2 or 3 weeks from the present date. So far this simple system seems to work pretty well.
