Cheap Natural Perennial Ground Cover Options Creeping Periwinkle – $1.07 per plant. Walk-on-Me Thyme – $3.99 per plant. Moss Phlox – $4.59 per plant. Violets and Pansies – Seeds range from $0.95 to $2.95. Early Snow Glories – $2.40 per plant. 15 Jun 2022