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Ceratostigma plumbaginoides
Leadwort
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Overview
Ceratostigma plumbaginoides is a low, spreading, herbaceous to semi-woody perennial ground cover reaching 6–12 inches (15–30 cm) tall with a spread of 12–24 inches (30–60 cm). The plant spreads by underground rhizomes to form a dense, weed-suppressing mat. Leaves are alternate, obovate, 1–2 inches (2.5–5 cm) long, medium green, turning bronze-red to deep burgundy in fall—a combination with the blue flowers creates a distinctive late-season display. Clusters of 5-petaled, cobalt-blue flowers 0.5–0.75 inch (1.3–2 cm) across appear from August through October. The true blue flower color is uncommon among fall-blooming perennials. Growth emerges very late in spring (often May), leaving bare ground until the rhizomes activate. The underground spread is moderate and controlled enough for ground cover use but may colonize adjacent areas over time. In cold zones (5–6), the plant dies fully to the ground; in milder areas, semi-woody stems may persist partially. The late emergence makes the plant useful over spring bulbs, which complete their cycle before the leadwort fills in.
Native Range
Ceratostigma plumbaginoides is native to western China (Sichuan, Hubei provinces). It occurs on rocky slopes, dry woodland margins, and open ground from 2,000 to 6,000 feet (600–1,800 m).Suggested Uses
Planted as a ground cover under trees, along borders, and on slopes at 12–18 inch (30–45 cm) spacing. The late-season blue flowers and red fall foliage fill the autumn gap. Functions over spring bulbs: the bulb foliage dies back before the leadwort fills in. Effective as a ground cover in mixed borders where the late emergence is managed by interplanting with spring ephemerals. Contains with edging in formal beds. Grows in containers of at least 2 gallons (8 L). The true blue flower color pairs with fall asters and chrysanthemums.How to Identify
Appearance
Size & Dimensions
Height6" - 1'
Width/Spread1' - 2'
Reaches mature size in approximately 2 years
Bloom Information
Clusters of 5-petaled, cobalt-blue flowers 0.5–0.75 inch (1.3–2 cm) across appear from August through October. Bloom duration is 6–8 weeks. The blue flowers overlap with the developing bronze-red fall foliage color from September onward, creating a blue-and-red combination.Detailed Descriptions
Foliage Description
Medium green, turning bronze-red to deep burgundy in fallGrowing Conditions
Sun Requirements
Requires 4-10 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Plant in full sun to partial shade in average, well-drained soil. Full sun produces the most flowers and the best fall color. Tolerates dry conditions once established. The late emergence (May) leaves bare ground in spring; do not cultivate the area in early spring or the rhizomes may be damaged. Mark the location to avoid accidental disturbance. The spreading rhizomes can be contained by edging or by planting in confined spaces. No serious pest or disease problems. Cut to the ground in late fall or early spring.Pruning
Cut all dead stems and foliage to the ground in late fall after frost or in early spring before new growth emerges. No pruning needed during the growing season.Pruning Schedule
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F
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A
M
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early spring
Maintenance Level
very lowContainer Growing
✓ Suitable for container growing
Minimum container size: 2 gallons