Shrubs for wet, then dry locations
I have been struggling to find which shrubs can handle a high spring water table which reverts to very dry conditions during the rest of the growing season. Apparently there is a rock strata about 5-6 feet down that "swells shut" during the late winter, spring rainy period making the ground pretty soppy but later the water percolates down and away. The surface gets quite hard packed as the spring wears on into summer.
I wanted to put in a shrub border (for birds/bees mostly) punctuated by small flowering trees but have had limited success. What has worked so far are cotoneaster, winterberry, and viburnum opulus- possibly clove currant. What bombed were lilacs and nannyberry. At the lower end (slightly moister) of the gently sloped yard I have elderberries, aronia and hazelnuts doing well near my young spruces.
What other options are there for this waterload feast/famine soil conditions in my midatlantic zone 6?