Originally Posted by
Viz
Hello mate,
what plant are you growing? Not all plants will change colour, and even "purple" strains will sometimes not change depending on phenotype.
OK here is what happens and how to make it happen.
As you know the environment has to be spot on. In this case it means having the correct temperature. Anthocyanin is typically hidden by the stronger pigments in chlorophyll and often during autumn the green pigments break down. This causes the anthocyanin to come out. Depending on the plant type (strain) it can cause yellow, gold or blue pigments to come out. During the flowering stage, turn the temperature down during the night cycle. It should sit below 10 degrees Celsius. Don't let it get too cold like close to 5'C and below, that is not good for our girls. The bud should begin to purple about two weeks before harvest.
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