I've emailed Kew, this rabbit hole is going to bug me for ages otherwise. And the worst they can say is "sorry, can't help"
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@quixoticgeek now I'm intrigued too. Perhaps also try the RHS if Kew can't help.
@DrHyde ooh, good idea. Hadn't thought of that.
@quixoticgeek just checked their online index and they have seed catalogues back to at least the 1840s.
@DrHyde yeah. That gives me a ~600 year gap .
