if it is like my red poison the color starts in the start of flower, starts to look like a red disease and spreads deeper from the middle of the bud/leaf and works itself to the ends of the leafs. very cool to watch. my other purple/red strains change late into flower not as cool as red poisons imo
My 1st non green pheno was blue dream and it took her half flowering cycle for it to come in and she was confused about it lol
i found 2 pics of her:
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