Thanks. Please understand that I am not advertising here.

If we commercial model-builders are going to build something, we might as well make it as easy as possible on our customers. So, I was just trying to express "thanks" for the idea to add a pierced terrain mesh to stone walkways already scheduled to be built as a product for Vue.

Plants are the "material" portion of the "Grassland" Ecosystem that first shipped as a standard Ecosystem in Vue 6.  If you take a look at the "Grassland Ecosystem" in the Material Editor, you'll see that it is made up of two layered materials. (Actually 4 materials, but see explanation below.)

One is called "Wall - rocks ferme" and the other is itself called "Material", and this second one is made up of two layers of materials. (And one of these, also is made up of two more materials, for a total of four materials into this standard ecosystem.)

But, back to the answer for your question, if you will select just this second layer called "Material", you can save it out by itself as "my Plants" or whatever you like. It will automatically save into the Ecosystems Library.  Then you can apply it to anything you like. That is what I did here.  (One thing we commercial folk try to do is to use standard Vue materials as much as possible to illustrate our wares. Inventiveness and Improvment is the province of all you good artists.)