Please rate my winter container and..

Please suggest, now that it’s ‘summer’, what flowers I could put infront of it in small pots to obscure the face of the corten steel?

The container held up all winter quite successfully, the Japanese forest grass has got the odd brown tips. Hoping these get replaced with fresh growth. The heuchera has blasted into life again but did hold its own over winter. Ivy good. Fern was good. Cordyline stood tall over winter too. Little red euphorbia has been a hero.