I use lead weights to anchor plants down when needed. I use a chunk of rockwool between the plant and the weight to prevent crushing the plants stem.
I have a fairly course plain gravel substrate and with Wisteria this is the only way I can get it too stay down when intially planted.
If I pull up the stem after a few months it may have some roots, but never a lot. The plant does well so I don't worry about it.