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Does the baking powder have any effect on already germinated seedlings or can it only be used on ungerminated seeds?
Maggi,I came very late to this very interesting thread and on reading through it your pictures of sundry postage stamps sent me off down memory lane to twenty plus years of stamp collecting and dealing. And on this bitterly cold day, with Margaret away for a week, that was a lovely, if unintended thing to do. Jim