Thanks for all your useful replies. One thing for sure, I will try and start using the seeds between now and early next year. If they germinate, I'll continue to use any remaining seeds in 2009. I'll just continue using them until they no longer germinate. In the process, I'll note down seeds viability for each vegetable over a period of time so that I have a record for future reference. This will be a useful experiment in itself.

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