In reviewing my seed collection for winter sowing I find myself with packets of seed, many dated more than two or three years ago. Does anyone know of a list by genera, at least, of viability times for stored seed? I know this is not a subject with hard and fast rules, but even some general guide lines would be useful and save time and energy sowing seed that's just too old to germinate. Thank you. Sylvia Sykora SF Bay Area