Thanks for your reply SK53.

“landuse=flower_bed” (or “landuse=flowerbed” as is used sometimes) is probably better than anything I’ve yet come across (even if it’s still just proposed) but it’s not ideal.

I was going to map these using areas of grass with a note to say that they should be reclassified but I’m not really comfortable with that as someone might assume that the areas could be traversed whereas they are generally impassable (except for the paths).

I think one of the problems I’m having is that I don’t know what this sort of land is called. It’s garden-like but not something I’d call a garden as gardens are usually private or at least enclosed in some way. It’s managed land but there’s probably no specific manager. It’s public but not somewhere that the public would normally be as that would look odd (and security would probably be called). They don’t just have one kind of plant in them so ‘flowerbed’ doesn’t really say what it has to but I can’t find anything better.

Since most of the land is impassable by people I thought about using barrier=hedge but that doesn’t seem right to me either.
I agree that more “soft”/mixed landscaping features should have tags. Maybe something like “landuse=vegetation” could be a more generic catch-all.