nice lookin buncha cola's on those there plants..looks like couple of em there in back need to bulk up quite  bit more from what i can see...as far as flushing plants im one those that just use plain water a couple weeks at the end like you do....some folks flush by runnin buncha water thru the soil (if in soil) and vacumn up the run off..thats way to much un-needed werk IMO..GL