Answer: Some of the sun loving perennials that grow well in your gardening region include: Ajuga, Aster, Astilbe, Black-eyed Susan, Calla Lily, Canna, Clematis, Columbine, Coneflower, Coral Bells, Coreopsis, Daylily, Dianthus, Diascia, Geranium,
Hibiscus, Iris, Lily, Lungwort, Mullein, Ornamental Grass, Penstemon, Peony, Phlox, Salvia, Scabiosa, Sedum, Thyme, Tiarella, Verbena, Veronica, and Yarrow. Roses are always a nice addition to the garden, as well.
Depending upon how much residue is there, you may have to replace the soil prior to planting. You can also dig or rototil the soil and then water it thoroughly to help dissapate the urine residue. Eventually it will degrade if exposed to sunlight and fresh air.
Best wishes with your garden!
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