If I understand you correctly, this is similar to air layering. This happens for me at times. When I dump a wheelbarrow load of mulch and a cane gets under the mulch, it will often root. Some of my ramblers that send long prostrate canes will root along where they touch the ground. I might even take a brick and put it over a cane so the cane is in contact with the soil (and then cover it all with mulch) to see whether I can get it to root.

Robert

What you are describing is called simple layering. Do a search for how to layer and you'll find what you need. It's quite easy and has a good chance of success.

I read about it and then tried it on some grafted roses that I would like to be own root. I guess I'll find out next fall if it worked. Another option for you may be to plant suckering roses, they will fill in between plants by themselves.