Zones 4-9. We haven't yet found true mini ferns, so we replicate them with a tiny perennial leptinella. These grow as tiny 2-inch ferns in clumps. Very hardy. May produce tiny golden flowers, thus the name “Brass Buttons.” Leaves are 11⁄2-2 inches long x 1⁄2 inch wide with fern-like look. We use as small scale ferns in rambling groves on our Garden Railroad. Sun, partial shade, well drained soil. Once established, takes some drought