Purple Colour From Cold Nights

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Anthocyanin expression shows up when night temperatures drop in late flower, so the same plant can finish green in one room and deep violet in another. The colour looks striking but says nothing about strength or terpene content. Which cultivars carry the genetic tendency are noted at https://queenfeminizedseeds.com in the descriptions. Chasing colour by chilling a tent too hard slows ripening instead.

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