I live in Florida and re-sodded my lawn with St. Augustine about a year ago. When I laid the sod, I didn't put any edging between the grass and the mulch bed areas. Now, the St. Augustine is growing shooters into the mulch bed. The roots grow into the weed control tarp and rip it when I pull them out. What do you recommend as the best long term edging solution? I think the plastic edging looks kind of cheap and am not even sure if it will work. Additionally, the home is 20 years old with lots of established trees around, to the ground is thick with roots. I think putting in an edging system that requires me to go more than a few inches below the soil will be very labor intensive due to having to cut up lots of roots.