Answer: Your phlox and daylilies will begin to grow once the air and soil temperatures warm up a little more. Hostas are usually the first to pop their heads out of the ground in the spring - your other plants will follow as soon as the temperatures suit them. Don't disturb them now... they'll wake up soon.
As for an attractive flowering shrub, have you considered azaleas, burning bush ('Emerald Gaiety'), hydrangea 'Annabelle' (grows only 2-3'), Russian Sage, or Spirea 'Crispa'.
Best wishes with your garden!
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