Good idea if you have rock solid ground that is hard to dig up. If you don't cover the holes you can use them for herbs & annuals. also lined with weed barrier cloth & used rebar in several places for stability. It makes maintenence super easy.
Gardener's Supply Recycled Rubber Edge Border Mulch buy this mulch that always looks fresh. Mow right over it. Use around raised beds, walkways or foundation plantings. Made of durable, recycled-tire rubber with the look of bark mulch Gardener's Supply
Garden Decor With Inspiring Raised Garden Beds: Outdoor Design With Garden Beds And Outdoor Seating Also Raised Flower Bed Ideas With Patio Pavers And Wood Fences Plus Lawn With Brick Walls And Garden Planter Boxes For Garden Ideas