I have heard that If you grow with mineral fertilizers you should wash the roots 15 days before harvesting To ensure the best out of your buds is this true

lol 6 questions*

flushing does nothing related to thc or flavor. Though, you could dial back the feeding a bit what little can be seen in the pictures is fairly dark green. so you have organic or 'mineral' - they all provide minerals :P lol 4 questions, think you got it covered.