Posted: 30/09/2013 at 21:19
Think you are right to consider dry shade plants.
What about brunneras? I grow hadspen Cream.....beautiful forget me not blue flowers in spring for a few weeks. Many geraniums, ESP,the phaem group, will grow there. I grow Margaret Wilson,which has pinky blue flowers over white foliage. This is stunning. Heucheras too....snowstorm has white foliage....most of them have white flowers. Japanese painted ferns,,although non flowering, have grey/blue folkage. Pulmonarias too would thrive there. Blue Ensign has gentian blue flowers in spring. Heucherellas come with white flowers. aster frikartii monch should grow well there too, ESP if you can incorporate some compost.
How about hellebores? Get plenty of goodness in there and go for white flowered varieties. I grow lithodora heavenly blue in the shade. Euonymous,emerald gaiety has white variegated foliage. white busy lizzies....new guinea hybrids,.....would fit in, again if you add something to the soil. Blue and white periwinkles, some,of the campanulas, epimediums with white flowers, white Japanese anemones (although they are invasive so need comtrolling) white lilium regale with scented white flowers in summer. Liriope is a late summer lavendar blue evergreen grass like plant. How about hydrangeas? Lovely white varieties. You need to add plenty of compost, manure,etc to the soil though. If your soil is acidic blue hydrangea would be fine. Think about hostas....I grow Fire and Ice. It has mostly white leaves.
I grow lots of blue flowering plants but generally my garden is mainly a sunny one so most of those I grow would not fit your,situation.
Im sure others will offer suggestions for blue and white flowers. I too will have a further think