My approach has been different from the good ideas suggested to you so far, Santa fe VA, but you may want to consider it, also, to suit the various needs and places on your layout where it may be practicable for you.
When I stripped everything off my first (crafted in 1994-95) layout for an expansion and fully re-done scenery, I quickly came to lament the loss of groundcovers and misc. other details. For the new layout, almost everything has been crafted onto dioramas, which fit together like a puzzle.
Here are some examples...
In these next examples, you can see the edges of the scene, which has had all of its elements affixed w/ permanent glues (usually "Gorilla Glue(s)" to its masonite base-sheet, and was then attached w/ screws to the layout itself. These scenes can be moved to different placements on the layout w/out loss of materials, or moved to my workbench to change details if desired.