Recycle fake wood decking as edging?

To hide lots of roots in a shady yard, I'm planting hostas and ground cover between the roots. I plan to use pine bark mulch. The yard slopes a little, so I need to put some sort of edging around it. The previous owner of this house left behind a lot of unused fake wood decking. Other than saving money and the obvious benefits of recycling, what are the pros and cons of this idea? (I would prefer the look of rock, but I have no truck for hauling. The short pieces of landscape timber in the photo are only a temporary solution.) Thanks for your response.
recycle fake wood decking as edging, gardening, landscape
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