18 Best Flowering Ground Cover Plants That Are Easy To Grow
Campanula portenschlagiana or ‘Dalmatian Bellflower’ is a beautiful annual or perennial plant that forms a mat of small rounded leaves. The flowers are star-shaped, blue-purple in color that blooms from spring through summer. Relatively cold hardy but requires shelter when temperature dips below much. It grows in full sun and in the part shade too, on a fairly loose, well drained and alkaline soil
Centaurea cyanus 'Blue Boy' - Cornflower - can be bought in bunches of 50 stems - cost around £30 max. I could put you in touch with some British flower growers - you may be able to negotiate prices yourself and want to use British grown?
A lovely white-flowered variety of this easily-grown campanula which covers its low mounds of foliage with upward-facing white bells for weeks in summer. It is useful for rockeries and alpine troughs and is robust enough to plant at the front of a border where it will bring pockets of freshness to the most sizzling summer day.