Can I use a thick rubber liner to keep orchids and lilies where I don'e want them?
Keeping Orchids and Lilies From Spreading
Certified GKH Gardening Expert
Yes, you can try this technique and it will likely slow the plants from spreading.
Likely though the plants will spread and need to be lifted and spilt at some point.
Dividing plants when they become crowded will make for healthier plants and better flowering.