Planting around a tree in full sun

So... I have a large twisted willow tree with a very high canopy. There is a circle around the base where in spring I’ve got cyclamen bluebells etc. This summer o created a wild flower meadow circle but having just cleared it all away am left with a bare circle of earth. So help please: dry fryable but clay based soil, full sun, some tree roots! No grass/turf suggestions please!!

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I think a mass of hakonechloa would look lovely.
If that's the wrong "grass" Soz!!
so this needs to be something else I think (or does it? 🤔)
hakonekloa are quite pricy & I’d love to find a way more cheaply 🙏🏻
Euphorbias would work, but anything you try will need some care initially to cope with the roots and lack of water.
I'd take those lower branches off as well to keep the trunks clean up to a decent height
I live in west central Scotland - not where that photo is...
yes it’s to replace the wildflowers , that didn’t really work & looked tatty for longer than they looked good!
I’d like permanent planting and although it’s under a tree it’s not woodland type plants. The tree has a very high canopy, there is a rose growing through it and as you can see in the photo a couple of irises grow at the base. It’s a dry sunny site - as the tree canopy is so high it doesn’t create shade...
I’m looking for mass planting, low maintenance (although I know initially I’ll need to water daily) and quite contemporary.
we open each year for the NGS (maple barn, Pebworth, Warwickshire) 😊☀️🤔👌🏻
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.