24 hours dark period with roots in a bucket of water

Many growers swear by hitting the roots with ice water the day before harvest. The ice shocks them and causes the plant to go into overdrive to try and procreate, supposedly. The evidence for this is all anecdotal though.

Pros - none. I know it seems to make sense that flushing would "take out" nutrients, but let me ask you this: how? The plant won't break them down. They won't evaporate. They're definitely not going back down through the roots. I feel like a broken record on this and I apologize, but there is nothing you can do to remove basic nutrients that are now a part of your plant. Check out the actual science, flushing is a waste and harmful to your end product. Peace my friend!