Purple autos only show their color if the genetics allow it, and even then most need a night drop of around ten degrees in the last three weeks to bring it out. Chasing the color by letting the tent get cold too early slows the plant, which is a poor trade on a fixed timeline. A list of autoflower seeds that reliably color up is kept on https://turboautoflowerseeds.com and includes a few that turn without any cold. Purple buds are not stronger, they just photograph well.
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