Overview
Coreopsis tinctoria, colloquially called Plains Coreopsis, is a member of the Asteraceae family native to North America but naturalized in parts of Asia, including China. The plant grows to about 2–4 feet tall, producing daisy-like flowers with striking yellow petals and dark red centers. Its rapid growth cycle (blooming within 60 days of sowing) and low maintenance requirements make it a favorite among horticulturists. Historically, indigenous communities used its flowers to produce yellow and orange dyes for textiles. Modern applications extend to pollinator gardens due to its nectar-rich blooms that attract bees and butterflies. In China, it’s cultivated as an ornamental species under the name '长春天人菊' (Changchun Coreopsis), particularly valued for urban landscaping projects.
Key Features
The plant’s most distinctive feature is its bicolor flowers, which measure 1–2 inches in diameter and bloom profusely from early summer to fall. Its fern-like foliage adds texture to garden designs. Coreopsis tinctoria is exceptionally drought-resistant once established, tolerating poor soils and full sun exposure. Another notable characteristic is its adaptability to various climates, though it performs best in USDA zones 2–11. The seeds are lightweight and easy to disperse, enabling natural propagation. For commercial growers, high-yield hybrid varieties are available, offering uniform flower size and extended blooming periods.
Application Areas
In ornamental horticulture, Coreopsis tinctoria is planted in mass displays for public parks, roadside beautification, and residential gardens. Its long vase life (up to 7 days when cut) makes it suitable for the floral industry. The flowers are also processed to extract luteolin, a natural dye used in food coloring and textiles. Ecologically, it serves as a cover crop to prevent soil erosion and supports biodiversity by attracting beneficial insects. Some herbal traditions utilize its roots and flowers for teas believed to have mild diuretic properties, though scientific validation is limited.
Precautions
While low-maintenance, Coreopsis tinctoria can become invasive in regions with mild winters due to prolific self-seeding. Gardeners should deadhead spent flowers to control spread. The plant is susceptible to powdery mildew in humid conditions; proper spacing and airflow mitigate this risk. Commercial buyers should verify seed purity to avoid contamination with weedy species. Although non-toxic, handling large quantities may cause minor skin irritation in sensitive individuals. Always source plants or seeds from reputable nurseries to ensure disease-free stock.
B2B Procurement Guide
Bulk purchases of Coreopsis tinctoria seeds or seedlings are typically available from specialized horticultural suppliers, with discounts for orders exceeding 50 pounds. Key considerations include germination rates (industry standard is ≥80%), seed treatment (e.g., pelleted for precision sowing), and compliance with phytosanitary regulations for international shipping. For landscapers, pre-grown plugs in trays (e.g., 128-cell trays) offer quicker establishment than direct seeding. Seasonal availability peaks in spring; forward contracts are advisable for large projects. Pricing fluctuates based on demand, with organic-certified seeds commanding a 15–30% premium.
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