I’d suggest something with a big tap root so doesn’t need much surface area, hollyhocks, foxgloves spring to mind, not reliably perennial as such but freely self seed and love a nook or cranny
Got quite a few plants over the weekend - helenium , sanguisorba and Verbena bon . Will be planting the heleniums and see how things go . Thanks for all your suggestions .
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Will be planting the heleniums and see how things go .
Thanks for all your suggestions .