Foeniculum vulgare is native to the Mediterranean basin but has naturalized across much of the world, finding disturbed roadsides and garden edges equally hospitable. In garden settings it grows 3 to 5 feet tall with thread-fine, aromatic foliage in yellow-green or, in the bronze forms, a warm copper that reads as purple in evening light. The flat-topped yellow flower clusters appear in summer and are strongly attractive to pollinators — fennel is a confirmed larval host plant for the black swallowtail butterfly, and a well-established clump will see a steady procession of caterpillars by late summer.

It thrives in full sun, tolerates clay and sand, and once established needs little supplemental water. The flowers, foliage, and seeds all carry the same clean anise flavor and are edible at every stage — flowers in egg dishes and salads, seeds in bread and sausage, stems raw or braised. Fennel does self-seed freely, and in some regions has escaped cultivation, so deadheading spent flower heads before seed ripens is worth the effort in gardens near natural areas. In colder climates it is grown as an annual; in zones 4 through 9 it often comes back reliably from the root.