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I echo what fidgetbones says. There was a chap on GW and he had the national collection ( I think ) of Digitalis. He said if there's even a hint of colour, other than pure green, they'll be purple. Only the pure green seedlings will be white.
I've been ruthless this spring and have only left the pure green seedlings. 100% white flowers .
I've seen white foxglove seeds on Amazon too,called Alba