Sure, a noble and lofty goal indeed. But, from seeing pictures of the same species in different peoples care you'd need to have dozens of people doing this to get some sort if idea what they grow like under different conditions. That is, if Joe can only get cultivar A to 6" but can grow cultivar B to 9" but Fred gets the reverse you don't want to consider either mans effort as a reliable metric; you need a bunch of data.
Sure would be a cool thing to do though Paul... I'm in
