My bro and me have kept the same mom alive for 5 years. Not by keeping the same one but by replacing her with her clone once a year or so. The only thing I have seen different is a couple of the clones now have some varigated leaves. There is really no such thing as clones from clones, it is still the same mother plant.

In South Carolina there is a Tea plantation I am going to. The Tea bushes were brought here almost 200 years ago from China. The Tea is all the same mother plant from then and continues to be cloned to replace old ones. I am going to get cuttings from there to start my own Tea and because genetics are heirloom.

Can you imagine a 200 year old MJ plant ?