Excel spreadsheet, lol, that's how I keep track, although DH is looking for something that works a little better for me..... heck, I need something just so I can remember what is which. We had some work done on our home that meant all of my hosta had to be dug up and moved - and now I have no idea what is which. And that drives me *nuts*,
Jmorth also has a pretty extensive tracking system.