Personally I love my red Cardinal Flower (Lobelia cardinalis) with my Nikko Blue. From Garden From 2009GardenPart 4 Or how about 'White Swan' Coneflowers? From 2009GardenPart 4 This was in July before it was in full bloom. The bright yellow Coreopsis 'Zagreb' blooms all summer and looks great next to the blue too. From 2009GardenPart3

Would like a few rooted Hydrangea 'Nikko' for CAMPANULA punctata Cherry Bells. Let me know if you are interested.

have banannas,crepe myrtles seedlings,saga palms,cannas,century plants,palm tree seeds,white hibiscus seeds,red spike canna. thanks

It is aluminum that gives Hydrangea macrophylla the blue flowers. If the soil is not sufficiently acidic, the aluminum is bound up and not available for easy plant access. It sounds like you are trying to maintain proper acidity but if the AL is not present in sufficient levels, even acidic soil will not produce the proper coloration. If you can get it, look for aluminum sulfate, sometimes known in this country as "hydrangea bluing" and apply according to label directions. Do not overapply. It takes awhile for it to become effective so you very likely will not see any results this season but you should next year.