flush
its when you feed the plant nothing but water for the last few weeks/month of flowering.
it helps the plant use up the excess chemicals and washes some away from the soil 2 i spose... we do this cos it makes the weed taste and smoke up a shitload better.
at least thats what it means in the sense your using it. otherwise if its just to get rid of nute burn you generally just flood the soil with water to dilute and wash any chemies out = a flush
So, if I were growing a 10 week auto-flowering strain with and aerogarden and the flowering stage is, lets say 8 weeks, give it nothing but water for a couple days, a week, 2 weeks?