Bloom/harvest cycle question

Harvest phase is when the plant goes into shutdown mode and stops taking up nutrients. A lot of ppl will "flush" their soil or medium with boatloads if water, but the plant will naturally stop taking up nutrients at a certain point on its own. This is how you get the beautiful colors you're looking for. Some people attempt to mimic fall by dropping air temps and even throwing ice directly on the soil. Wether or not it does anything but make it look pretty... 🤷I dunno