Anthemis punctata ssp cupaniana is another evergreen perennial or you could say ever-silver because the foliage is silvery grey.  From spring to autumn this plant will produce white daisy blooms if deadheaded on a regular basis. It combines well here with Geranium himalayense that has its main flush of flowers in early summer and then spasmodically through to autumn. Two good plants for fronting a border in the sunshine.