Buy Flowers › Pycnanthemum incanum - 4" Pot Pycnanthemum incanum - 4" Pot $6.50 Silverleaf Mountain Mint, eastern US native, zone 4-9 spreading perennial, stems 2-4 feet tall, silvery foliage, full sun/pt shade Add To Cart Added! Silverleaf Mountain Mint, eastern US native, zone 4-9 spreading perennial, stems 2-4 feet tall, silvery foliage, full sun/pt shade