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How long will seeds last?The answer is - it depends. Different species of vegetables have very different seed life, ranging from the Liscari Sativa which we only sell from harvest til the following spring, because by the summer the seed will be dead, through to melons, where some older gardeners swear by using 5 year or older seed because they believe it gives more fruit.
Do be aware that the way in which seeds are stored will affect their life – the following times assume that the seeds have been stored somewhere cool, dry and dark. If seeds get damp or are kept in warm conditions they will keep significantly less well. You'll only reach the top end of the seed life shown below if the seeds are really dry and kept somewhere in an airtight sealed packet (not paper) that stays at a steady cool temperature. Also, germination is not an on/off state, what will generally happen is that as seeds get older the percentage that germinate will start to drop off, and then at some point will fall to zero.
If do you have an old packet of seeds, and wonder whether they are worth sowing, you can always test their germination yourself. Put a couple of layers of damp kitchen towel on a saucer, sprinkle a few seeds on it, and wrap it loosely in a plastic bag (so that it stays damp but is not airtight). Put the saucer somewhere warm - an airing cupboard is ideal – and check after a few days. If your test seeds have germinated, then you are fine to go ahead and sow the rest, sowing more thickly if only a proportion of them grew. If nothing is happening, then you need new seeds.
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