Anthocyanin expression usually depends on cool nights, often a ten degree drop late in flower, and wishing does nothing for a green plant. A few lines colour reliably at ordinary room temperatures because the trait is genetically fixed rather than stress dependent. Varieties that show colour without chilling are flagged in the descriptions on
https://budweedseeds.com. Dropping tent temperatures purely for looks costs you resin and weight, which is a poor trade.
