earth dust bloom

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...

Hey yall, my plants (Autoflowers) are about one month in flowering and recently I have noticed the leaves are turning yellow and recently spotty? I haven't experienced this before does anybody have any recommendations or solutions to help them? I am leaving my details below. Growing on Foxfarm...