Fred, great advice about the soil-less mix. I have a lot of my daylilies potted right now and I have problems with root rot. I heard about this before but did not have the nerve to try it for some reason. But after hearing about your success I will try it.
May I ask why do you add lime? Sounds like you do that automatically. May I ask what kind of fertilizer do you add?
I was wondering how long do the wood boxes last. Do they rot after a number of years? I love the lattice, that looks so attractive and the boxes seem like they would be so easy to manage.