Hedges of Rosa rugosa and Azalea luteum
In spring:
Muscari - blue & white
Tulipa reptans
Tulipa tarda
Stachys byzantica (lamb's ears)
In summer into autumn:
Ajuga reptans
Allium
Anemone japonica
Cerastium tomentosum (snow in summer)
Fuchsia ‘Mrs Popple'
Geraniums eg ‘Johnstons Blue'
Heuchera ‘Palace Purple'
Polemonium caeruleum (Jacob's Ladder)
Sedum ‘Autumn Joy'