Any suggestions for perrianials who will survive being planted in Buxus borders? (Size aprox 2x2 meters or 7x7 feet) Dutch soil (clay-ish) avarage sun, (depending the location in the garden from 3 up to 9 hours sun in summertime). Buxus borders are about 0,5 meters high, 1,5 feet).
Thanks for any tips in advance!