It depends where you get your seeds from 2Sheds. The smaller companies such as Tamar and Kings can tell you which ones are treated and which not, in fact Tamar only sell untreated seeds and I think Kings are the same.

And most catalogues seem to sell seed specifically for sprouting anyway.

I will however say that generally speaking stuff from our local asian cash&carry works out cheaper than the catalogues though.

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Earthbabe
If at first you don't succeed, open a bottle of wine.