Too cold outside to get into the garden here in Nottinghamshire so I'm having a seed audit (and a nice cuppa). I've already bought some exciting new seeds from Higgledy Garden which won't fit in my seed tin because it's so full of, well, seed packets that are open, out of date, and sealed but out of date. Would you just chuck old seeds? I know, in theory, they lose viability, but I have heard that can just be so the seed companies encourage us to buy more. Also, how out of date is just too old? I have some 2015 seeds in there.
Any advice much appreciated. Thanks!