1stmannyanswered grow question 5 years ago hi Boris
plants are flushed a few weeks (at least 2 weeks) before harvest to remove any excess nutrients,
do not flush , if your growing in all organic super soil. in super soil , you need to top dress at week 4 or 5, so the plant runs out of nutrients by the end of its life cycle.
if you think your plant is detoxifying, or nutrient locked, then you should flush
read this from link from 420fastbuds https://2fast4buds.com/news/how-to-flush-autoflowers
i hope this helps !! happy growing