I believe we have been using the term ‘phenotype’ wrong for decades

Breeder's Lab
143

Search civil twilight hours at your location, there is not a great deal of difference between 33-34n and 39n. I consider it safe to bring clones of most any variety out when civil twilight reaches about 15 hours. For me at 39n this means right around June 1. I saw the post in Tony’s thread, I do not think there is enough variation in DC to bother trying to stretch the season out by way of selective breeding. Returns/progress would be very minimal if measurable at all, and you will have added a selection criteria - that always costs something somewhere else.

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