Plant library · Herbs
Ruta graveolens
Rue is a blue-green perennial herb that brings a compact, pungent-foliaged presence to a sunny planting. Growing about 2½ feet tall and 2 feet wide, it has enough height for the middle of an herb border while remaining low enough to keep sightlines open. Yellow flowers extend from early through late summer, adding a seasonal lift above the foliage.
Use rue as a repeated structural herb along the middle or back of a dry, sunny border, leaving the front edge for lower plants and an open route for access. Its upright, mounding habit also suits gravelly beds, wall-side borders, and other hot, freely draining positions. Keep it in a dedicated stretch of the herb garden rather than mixing it into planting blocks for basil, sage, or cabbage.[1][2]
Set plants 18 inches apart, center to center, for a continuous planting with light overlap as they mature. Each clump can reach about 2 feet across, so reserve a band at least that deep when placing it beside a path, edging, or shorter herbs. In a narrow bed, use a single row rather than trying to crowd it between larger perennials.
Place rue in full sun, where its compact form is best suited to a warm, exposed bed. It handles low-water planting once established and fits dry or rocky ground, but the site must drain freely. Avoid low pockets and persistently wet soil, especially where winter moisture lingers around the crown.[1][2]
Rue occupies its space year after year in Zones 4 through 9, with foliage providing the main visual mass before the summer flower clusters rise. Plan harvesting from late spring into summer without relying on the plant as a temporary gap-filler. Its early-to-late-summer bloom period also gives pollinator-friendly beds a longer flowering interval.
Allow room to renew a planting over time rather than treating it as a permanent woody anchor. Plants can become woody with age and are often short-lived, though self-sown seedlings may appear nearby. Keep a little open soil around the original clump if seedlings would be welcome; otherwise, remove unwanted seedlings before they claim adjacent planting space.[1]
Editorial content updated 2026-07-20.