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Purple buds sell seeds because the photos look striking, but colour comes from anthocyanins and cold nights, not potency, and plenty of purple lines are middling in every other respect. Some only turn colour if you drop the temperature late in flower. Listings on https://budweedseeds.com note whether a strain colours on its own or needs a cold finish, which is a useful distinction that most shops skip. Buy purple for the look if you like, just do not expect it to mean anything else.