ehhhh, if the plant needs to be fed then feed it, but my plants as they get closer to being done don't seem to need anything so I just give them plain water unless they look like they need something else...I have overnuted so much that I am a pro at spotting nute stress...so I don't give nutes more often then I do give them...plants really don't require as much as we think...and most of what i use is pretty slow release, so it is still in there even at the end...no need to keep adding sometimes, but not necessarily because of a need to flush....I mean outdoor plants aren't "flushed" So unless you are using a lot of harsh chemical nutes then I wouldn't worry too much about that...and in soil it is just easier to amend the soil organically...way easier... but not really as fun...and kinda grosser...aww jeez...I'm getting far off topic here and probably a little behind too somehow...so I am going to stop this and just say that it is not always necessary to flush, some people do and some people don't...and most people can't tell the difference...I guess if you were using like too much and harvested while they were still like having too much it might be an issue...dammit I have no idea if that was helpful or not...turns out that when I use the whip thing on the vape I am not doing something right...or long enough...or something...anyway I will just like not feel anything, and then I remember oh yeah...that is why I just wait for the bag...sometimes it is a hassle and I don't want to deal with the bag...anyway...went back to the bag and BAM! Can't type without rambling...