We've used a couple of different techniques to label Mushroom Logs over the years. Previously, we cut squares out of flashing material and scratched a number on each one. That worked well...except sometimes it was hard to read the scratched number and sometimes the sharp edges cut into my hands.

Better has been a very simple system using plastic circles that we accumulate while making EZ Misers. One circle is WW70, two circles is Snow Cap, and three circles is Native Harvest. Aside from having to check my key every time I want to know which variety is currently fruiting, the new technique has been trouble-free.