Docker-machine create uses edge? How do I get stable?

When I use docker machine create with the amazonec2 driver, I can only install the edge version. I need this in a production environment. The current edge version, 17.11.0 is crashing on a daily basis. How do I use “docker-machine create” to install the stable branch?
On a side note, what sane distribution would default to installing the unstable or “edge” version without specifically being prompted to?