For the details of how this old variety came to be released, see Alan Romans' book. Apparently it is believed to be derived from the old English variety 'Snowdrop', and Alan gives the date of introduction as (possibly) 1881. He selected 'Witchill' for cleaning up and micropropagation and this variety is now available as seed tubers.
My plants grew vigorously and rapidly in pots; the tubers were attractive and of very good 'floury' flavour. It's not really a true 'early' but it matured more quickly than a normal 'maincrop' potato. The foliage, once it loses its youthful vigour, dies down rapidly.
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