Garden Scheme
Plant library · Perennial Flowers
Rudbeckia fulgida
Black-Eyed Susan is a 2½-foot perennial that brings a long run of golden daisy flowers from midsummer into early fall. Its roughly 2-foot mature width gives it enough presence for the middle of a sunny border while keeping sightlines open in front of taller perennials or shrubs. Use it where its bright summer-to-fall display can repeat through a bed or gather into a broad naturalized planting.
Space Black-Eyed Susan 18 inches apart, measured center to center (45 cm).
The mature spread is about 2 ft (60 cm), so plants set at that distance grow together into a solid mass.
Treat 18 inches as a planning baseline — cultivar and local growing conditions shift the final footprint.
Place Black-Eyed Susan in full sun, set back from a bed edge so its leafy clumps and flowering stems do not spill into a path. It suits borders, informal drifts, meadow-inspired areas, and other sunny planting zones where several plants can read as one repeated block. Allow a reachable edge or stepping access nearby for deadheading and eventual division, rather than packing the planting tightly against a wall, fence, or fixed structure.[1][2][3]
Set plants 18 inches apart, center to center, for a quickly joined planting. Each plant can ultimately occupy about 2 feet of width, so this spacing creates a continuous band rather than isolated dots; reserve the full width on both sides of the planting line. In a narrow border, use a single staggered row and keep the path-side edge clear enough to reach into the clumps without treading on neighboring plants.
Give this perennial a full-sun position with well-drained soil and moderate moisture through the growing season. Avoid sites that stay soggy, especially where runoff collects beside foundations or at the bottom of a densely planted bed. Once rooted in, it can handle some dry weather, but plan irrigation access for extended summer dry spells so the flowering area does not become a neglected back corner.[1][2][3]
The main display begins in midsummer and carries into early fall, making Black-Eyed Susan useful for filling the interval after many spring-flowering perennials have faded. Deadheading can extend the bloom display, while stems and seedheads may be left standing into winter when their structure is wanted in the bed. Leave enough clearance around the clumps for fall cleanup or spring division.[1][2][3]
Black-Eyed Susan gradually enlarges by underground stems and can form broader clumps over time. Build this expansion into the plan by avoiding a permanent gap of only a few inches between it and slower, smaller neighbors. In long-lived borders, reserve room to divide and reset clumps every few years if the planting begins to crowd its intended footprint.[1][3]