Unlike walls, most fences aren’t solid, so plants don’t have to choose one side or the other. Perennials and reseeding annuals
can start out on one side, spread by roots or seeds through the pickets, and bloom for you on the other side too. Black-eyed
Susans are great for this.
Other good choices include asters, bearded irises, bee balms, daylilies, four o’clocks, goldenrods, mums, phlox, purple coneflowers, Queen Anne’s lace, and spider flowers.