Teresa, This could be the beginning of a great thread.
I don't have luck with making my own tufas. Really no place to work and too old to lift cement.
I did make one 15 years ago and it dissolved over winter despite being covered with plastic.
I cant wait to see what everyone comes up with.
On the old DG site there was someone from Japan who used "papercrete" and made some great ones. I'll see if I can find it.
These are my locally made ones.
This one is barely 8 inches and not deep enough to plant anything but rollers
These are nice with small feet.