Gardens of the future and even today are going for recycled plastic in a big way.
This video is about just such a garden employing recycled plastic for the fencing, benches, picnic tables, edging and even the ground reinforcement grids that hold the soil and gravel together.
If you can do it in wood, you can just as easily do it with recycled plastic lumber and recycled plastic wood.
And you can even get creative with colour using HDPE sheet materials and coloured plastic wood.
Looks and feels like wood but lasts at least 5 times longer.