Once it falls off, you can do anything you would normally do with a plant. If you wait until it falls off it will be large enough that its tough to not see (mine where about 2-3" in size). Tie it down with something, plant it in the substrate, or as I prefer to do in my tank with PFS.....use small quartz stones around the base of the roots. This allows you to get the benefits of it looking planted, as well as the plant getting the proper nutrients. I bought a 50lb bag from Home depot of pink quartz, washed the stones really well and put them in the tank. They look quite nice, are big enough that you won't lose them, and are rough enough that the plants roots can grab on.