Question: blacktop was right up to house. I made a stone planter on the blacktop,filled it with soil,
planted shrubs Problem?
Answer: The only potential problem might be absorbed and radiated heat in the area. You'll have to wait and see - or choose a shrub that tolerates reflected/radiated heat. Best wishes with your new shrubs!
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When singular and plural spellings differ, as in peony and peonies, try both.