Interesting topic. I label my herbs, but not much else. The herbs were initially labeled because they were mostly all new to me. Now that I am more familiar with them, not needed so much, but I do find it useful when folks are walking my labyrinth - they can simply read the label to know what they are looking at. I'm considering expanding the herb labels to include a brief summary of use, although some are so varied that may prove to be complicated. I don't label any of my perennials or shrubs, although I do keep track of these via "My List" on ATP, and note in the personal comments section where a particular plant is located. I also make up a label including cultivar (if known) for any plants I plan to gift or trade.