flush harvest trich miracle stress

My plants are a little behind on their need for flushing, I am growing autoflower in FFOS and using Organic Earth Dust fertilizer. Does anybody know if i have to flush like people claim to do whilst using liquid fertilizers? Is it really just for taste reasons? And if so, what are some tips...

Shoot me a ballpark of how much longer you think this lady has left. I believe I accidentally stumbled upon an stress miracle. The trich development here is unprecedented considering how much longer I think it's got left unless I end up with a diminished harvest (not likely from growth spurts...