You’ve probably seen the colors I bring out in my plants.
Part of it is genetics, but I’ve brought out some deep deep purples In plants I never expected.
It could be pH. I know that will affect hydrangea colors, but it only seems to change the flower hue not the entire plant.
My pH actually bumps up to pH7 by the end, (which I try to maintain lower). It hovers around 6.5 until the last month or so, and then steadily climbs each week. I’m assuming it’s as the buffers in the soil start breaking down. Does the changing pH lock out nutes like phosphorus, thus affecting color?
In the winter my basement flowering tent sees regular nighttime temps into the 50’s f, and daytime highs into the 70’s. In the summer it’s usually lows around 70f and highs into the mid 80’s f. I grow with the same nutes, strains, and schedule (other than more watering in the summer). I see no pretty hues With warmer temps. But… the color changes only start appearing in the last month, even though the cooler temps have been consistent the entire flowering cycle. So I doubt it’s any one thing that’s changing the colors.
It could be a combination of temps, ph changes and genetics all working together.