Coreopsis, commonly known as tickseed, is a genus of flowering plants in the Asteraceae family. Native to North and South America, these plants are prized for their bright, daisy-like flowers and long blooming periods. With over 80 species and numerous cultivars, Coreopsis offers a wide range of options for gardeners, from compact varieties to tall, sprawling types. Understanding the characteristics of different Coreopsis varieties is essential for selecting the right one for your garden.
When selecting a Coreopsis variety, consider the following plant-specific factors:
2.1 Growth Habit: Coreopsis varieties can be annuals, perennials, or subshrubs. Perennial types like Coreopsis grandiflora return yearly, while annuals like Coreopsis tinctoria complete their lifecycle in one season.
2.2 Height and Spread: Dwarf varieties like Coreopsis 'Nana' grow only 6-12 inches tall, ideal for borders, while taller species like Coreopsis tripteris can reach 4-6 feet, suitable for backdrops.
2.3 Flower Color and Form: Coreopsis flowers range from yellow and gold to pink and red, with single or double blooms. For example, Coreopsis 'Moonbeam' features pale yellow flowers, while Coreopsis 'Roulette' has striking red-and-yellow bicolored petals.
2.4 Soil and Sun Requirements: Most Coreopsis thrive in well-drained soil and full sun, though some tolerate partial shade. For instance, Coreopsis verticillata adapts well to poor, sandy soils.
3.1 Coreopsis grandiflora (Large-flowered Tickseed): This perennial produces large, golden-yellow flowers and grows up to 2-3 feet tall. It’s drought-tolerant and ideal for sunny borders.
3.2 Coreopsis verticillata (Threadleaf Coreopsis): Known for its fine, thread-like foliage and delicate yellow flowers, this variety forms dense clumps and spreads gradually, making it excellent for ground cover.
3.3 Coreopsis rosea (Pink Tickseed): A rare pink-flowered species, it prefers moist soils and partial shade, offering a unique color contrast in gardens.
3.4 Coreopsis tinctoria (Plains Coreopsis): An annual with vibrant red-and-yellow bicolor blooms, it’s easy to grow from seed and attracts pollinators.
4.1 For Dry, Sunny Gardens: Coreopsis grandiflora and Coreopsis verticillata are excellent choices due to their drought tolerance and preference for full sun.
4.2 For Moist or Shaded Areas: Coreopsis rosea performs well in these conditions, though it requires more water than other varieties.
4.3 For Pollinator Gardens: Coreopsis tinctoria and Coreopsis lanceolata attract bees and butterflies with their nectar-rich blooms.
4.4 For Containers or Small Spaces: Dwarf varieties like Coreopsis 'Little Sundial' are compact and suitable for pots or edging.
5.1 Deadheading: Regular removal of spent flowers encourages prolonged blooming in most Coreopsis varieties.
5.2 Division: Perennial Coreopsis benefits from division every 2-3 years to maintain vigor and prevent overcrowding.
5.3 Pest and Disease Resistance: Coreopsis is generally low-maintenance but may occasionally face issues like aphids or powdery mildew. Choosing resistant varieties like Coreopsis 'Zagreb' can minimize problems.
