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International Flower Bulb Centre
CROCUS 'Zwanenburg Bronze'
Hybrid Crocus, Spring Crocus
Providing a welcome burst of color at winter's end, this heirloom crocus opens its showy flowers even as the last remnants of snow linger. Introduced in the early twentieth century, it is one of many hybrids that trace their ancestry to Crocus chrysanthus and C. biflorus.
Growing from a small bulb-like storage organ known as a corm, this diminutive herbaceous perennial sends up one to four flowers in winter or early spring, just as the grassy, shiny, dark green leaves emerge. Held singly atop ankle-high, stalk-like floral tubes, the up-facing, goblet-shaped blooms have six "petals" (or segments) in two whorls. The three outer segments have mahogany-brown, yellow-rimmed exteriors and yellow interiors. In bright sun the flowers open wide to reveal the yellow inner petals, anthers, and stigmas. The floral tube is purple-brown. The foliage goes dormant by late spring.
Grow 'Zwanenburg Bronze' in friable, well-drained soil in full sun or light shade (when it is in leaf). Plant corms at a depth of two to three times their height in late summer or early fall. Ten or more weeks of near-freezing temperatures are needed to induce flowering. Group this little beauty in rock gardens, mixed borders, alpine troughs, or turfgrass, or force it in pots to help quell winter doldrums.
8 - 1
3 - 8
1a, 1b, 2a, 2b, 3a, 3b, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Bulb or Corm or Tuber
Full Sun, Partial Sun
3"-4" / 7.6cm - 10.2cm
2"-4" / 5.1cm - 10.2cm
Early Spring, Late Winter
Container, Lawns and Turf, Mixed Border, Rock Garden / Wall
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