Growing Black-Eyed Susan in a pot

Black-eyed Susan is a low-maintenance perennial once established, but a few seasonal tasks keep it flowering reliably. Water moderately during the growing season, aiming for moist but not waterlogged soil. In spring and early summer, water weekly if rainfall is scarce, particularly on free-draining loam. Clay soils retain moisture longer, so check before watering; soggy roots invite rot. By late summer, established plants tolerate short dry spells, though prolonged drought reduces flowering. In autumn and winter, natural rainfall is usually sufficient. Feed in March or April as new growth begins. Scatter a general-purpose granular fertiliser such as blood, fish and bone or Growmore around the base at the rate recommended on the packet—typically a small handful per plant. Rake it lightly into the soil surface. Avoid high-nitrogen feeds, which promote lush foliage at the expense of flowers. A second, lighter feed in late April benefits young plants but isn't essential for mature clumps. Top up mulch in spring to suppress weeds and conserve moisture through summer. Rudbeckia fulgida is hardy to zone 3a, so overwintering in temperate Europe presents no difficulty. No protection is needed; the crown survives frost and snow without issue. In waterlogged winter soil, however, crowns may rot—ensure drainage is adequate when planting. Pests are few. Slugs and snails occasionally nibble young spring shoots; use organic pellets, beer traps, or hand-pick at dusk if damage is severe. Powdery mildew can appear as white patches on leaves in late summer, especially in dry conditions or crowded plantings. Improve air circulation by dividing congested clumps and water at the base rather than overhead. Affected leaves can be removed, but mildew rarely harms overall vigour.