I stake my dwarf trees to 3/4" galvanized conduit (10’ with 4’ in the ground and 6’ above). I label the conduit with small swatches of aluminum flashing. I write on the flashing with an electric engraver. I attach the aluminum flashing to the conduit with hose clamps. (If this be overkill, let’s make the most of it.) I have room to record the variety, the size at planting, the date planted, the root stock, and the source of the scion.