Hi Grow.

From my understanding is the purple shows up in drastic temp changes. When I did my last grow of Hashberry it was in the middle of winter and I knew they had purple genetics.

What I did is I cracked my window in my grow room ( It was about -30 degrees out side or so ) I had the windows open for approx 3-4 mins, closed it and turned my light off for the night.

Next morning I came back and had purple starting to stem out on leaves, fresh growing bud, it was pretty bad ass.

Do NOT spray your plants with water, too much in 1 area can lead to mold & we never want that.

Let them do there thing, do not induce anything. I did mine just for fun and to see if it would work.