To test the viability of last year's seeds, I put 10 of each seed in a tray with wet paper towels. The number that sprout is the percentage of viability. Less than 40% I throw out. 50, 60, 70% I plant twice as many seeds. 90 and 100% I consider good as new. The number on the paper towel following the name of the seed company is the year they were first bought. The 2011 basil did fine!
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