When Mel Ednie beat the world record for the heaviest onion back in nineteen oatcake, the seed came from an opened packet he found in an old jacket that had been hanging in his shed for a few years. Of course we all know that seed becomes less viable as the years go on but onion is more resilient than some.
Seed compost is low in fertiliser to start with so it wouln't suffer too much from the goodness leaching out of it.
I'm pleased for you that you had a good season with your onions but and there is always a but,
there is no need to take un-necessary risks especially with a crop you only really get one chance with- if your sowing fails for any reason, your next effort may well be too late to be able to expect a good result at the end of the season.
So new seed and fresh compost every time guys and girls
Seed compost is low in fertiliser to start with so it wouln't suffer too much from the goodness leaching out of it.
I'm pleased for you that you had a good season with your onions but and there is always a but,
there is no need to take un-necessary risks especially with a crop you only really get one chance with- if your sowing fails for any reason, your next effort may well be too late to be able to expect a good result at the end of the season.
So new seed and fresh compost every time guys and girls
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