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The Plant Guide

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Giant coneflower

Rudbeckia maxima

rud-BEK-ee-ah MAKS-ih-mah Audio

This choice species makes a strong vertical statement with its large, smooth, sea-green leaves and towering stems to 6 feet tall. It bears short, yellow ray florets with giant, upright cones at the center. It prefers average soil with good drainage, and is excellent in native or wild plantings.

Noteworthy CharacteristicsRudbeckias hail from the moist meadows and dappled woods of North America. They are suitable for mixed borders, meadows, native gardens, open woods, and large annual displays. 

CareGrow in average, slightly heavy but well-drained soil in full sun to partial shade.

PropagationSow seed in a cold frame in early spring, or divide plants in spring or fall.

ProblemsAphids, powdery mildew, smut, rust, Ramularia and Septoria leaf spots, snails, slugs.

  • Genus : Rudbeckia
  • Plant Width : 1 to 3 feet
  • Plant Height : 3 to 6 feet
  • Zones : 4, 5, 6, 7, 8
  • Bloom Time : Fall, Summer
  • Light : Full Sun to Partial Shade
  • Maintenance : Low
  • Moisture : Medium Moisture
  • Growth Rate : Moderate
  • Plant Type : Perennials
  • Characteristics : Self Seeds, Showy Foliage, Showy Seed Heads
  • Plant Seasonal Interest : Summer Interest
  • Flower Color : Yellow
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