It happened in my garden this year, large smart pots. Let them dry out way to long and half the plants got Amber trichs. I flushed 3 times w a lot of water, it took about a week to c new white hairs. they doubled in size in the last two weeks. I thought they were done at the beginning of September and was gonna have a diminished harvest. Thank goodness I waited. Try flushing then w lots of water to like 10-20% run off if you're in a container bigger than 200g.