The plants that come back. Herbaceous perennials rise from the crown each spring, flower through the warm months, and retreat to the ground in winter, returning larger the year after. They are the flowering heart of the border, the long-term investment that repays a gardener season after season.
Blue-stemmed goldenrod is the goldenrod for shade. Where most of the clan demand open sun, Solidago caesia threads through the dappled light of the eastern woodland, arching slender, blue-purple stems that carry small, brilliant yellow flowers packed into the leaf axils, so the bloom runs the whole length of each stem like a garland. That habit gives the second common name, wreath goldenrod, and the late-summer to autumn color arrives just as the shade garden begins to fade.
Copper Canyon daisy is a big, aromatic, autumn-flowering marigold from the mountains of southern Arizona and adjacent northern Mexico, grown as much for the scent as the show. Brush against the finely divided, fern-like foliage and the plant releases a strong, distinctive fragrance, a mix of citrus, anise, and marigold that some find intoxicating and others frankly pungent. Tagetes lemmonii builds a soft, shrubby mound three to four feet high and wider still.
Tagetes lucida is the herb that does it all. Known as Mexican tarragon, Mexican mint marigold, pericón, and, in the old Aztec tongue, yauhtli, this fragrant perennial from Mexico and Central America earns every name. The narrow, glossy, deep-green leaves carry a warm anise-tarragon scent and flavor, and in late summer and fall the plant scatters small, single, golden-yellow marigold flowers across a tidy foot-and-a-half mound.
