Newb Question

When I'm about to harvest, would it be possible to pull the plant root and all, then place the root in a cup or pot of water to flush the plant for couple hours or so then take it to dry?

you could do whatever you want. more effective to just stop feeding the last 2 weeks

That wouldnt be a good idea, youll shock the plant so it wont take anything in, let alone the fact that flushing takes a week or two and plants take up water slwly...very slwly ..

read up on flushing

Nope that wont work the plant is not going to be flushed doing that.
Just keep watering the last 2 weeks but don't give them any food.

just cut it with cutters and then trim it like a pro

^^^ agreed