Coreopsis, affectionately known as tickseed, is a vibrant and hardy flower that brings a splash of sunshine to any garden. Whether you’re a seasoned gardener or just starting out, this comprehensive guide will walk you through everything you need to know about growing and caring for these cheerful blooms.
Understanding Coreopsis
Botanical name: Coreopsis
Height: Typically 12-36 inches (30-91 cm)
Spread: Usually 12-24 inches (30-61 cm)
Sun exposure: Full sun
Soil requirements: Well-draining, neutral pH
Hardiness zones: USDA Zones 4-9
When to plant: Spring or fall
Types of Coreopsis
Coreopsis comes in two main types:
- Clump-forming: These varieties grow in neat mounds and are often grown as annuals.
- Rhizomatous: These spread via underground stems and are better suited for perennial gardens.
Popular Varieties
- Mango Punch: Boasts sherbet-colored blooms in shades of orange and peach
- Pink Sapphire: Features bright pink flowers with white centers
- Pinwheel: Offers pale yellow flowers with unique spoon-shaped petals
- Double Sunburst: Displays semi-double yellow blooms for a fuller appearance
- Polaris: Presents pure white flowers with contrasting yellow centers
Planting Coreopsis
Choosing the Right Location Coreopsis thrives in full sun, so select a spot that receives at least 6 hours of direct sunlight daily. These plants adapt to various soil types but prefer well-draining soil with a neutral pH.
Planting Process
- Space between plants 12-24 inches apart, depending on the variety.
- Dig a hole twice the width of the root ball.
- Place the plant at the same depth it was in its container.
- Backfill with soil and water thoroughly.
Container Planting For those with limited space, coreopsis grows well in pots:
- Choose a container with drainage holes.
- Use a high-quality, well-draining potting mix.
- Ensure the pot is large enough to handle the plant’s mature size.
Caring for Coreopsis
Watering
While drought-tolerant once established, coreopsis benefits from regular watering:
- Water deeply once a week especially during dry spells.
- Container plants may need more frequent watering, especially in hot weather.
- Avoid overwatering, as coreopsis prefers slightly dry conditions.
Fertilizing
Coreopsis doesn’t require heavy feeding:
- Apply a balanced, slow-release fertilizer in early spring.
- For potted plants, use a liquid fertilizer monthly during the growing season.
- Avoid over-fertilizing, which can lead to excessive foliage growth at the expense of blooms.
Pruning and Maintenance
Regular pruning keeps coreopsis looking tidy and promotes continuous flowering:
- Deadhead spent blooms on daily basis to encourage more flowers.
- In midsummer, cut back plants by about one-third to promote a second flush of blooms.
- Divide perennial varieties every 2-3 years to maintain vigor and prevent overcrowding.
Pest and Disease Management
While generally pest-resistant, coreopsis can occasionally face issues:
- Aphids: Treat with insecticidal soap or a strong water spray.
- Powdery mildew: Improve air circulation and avoid overhead watering.
- Crown rot: Ensure proper drainage and avoid overwatering.
Seasonal Care
Spring:
- Plant new coreopsis or divide existing clumps.
- Apply fertilizer as new growth appears.
Summer:
- Deadhead regularly and provide supplemental water during dry spells.
- Perform midsummer pruning for reblooming.
Fall:
- Reduce watering as temperatures cool.
- Cut back perennial varieties after the first frost.
- Apply a layer of mulch for protection in winter.
Winter:
- Leave dried foliage in place to protect the crown.
- For container plants, move to a protected area or wrap in burlap.
Growing Coreopsis from Seed
For those who enjoy starting from scratch:
- Sow seeds directly in the garden in early spring or start indoors 6-8 weeks before the last frost.
- Lightly cover seeds with soil, as they need light to germinate.
- Keep soil moist until germination occurs, typically in 1-2 weeks.
- Thin seedlings to 12-18 inches apart when they reach 2-3 inches tall.
Why is Coreopsis Called Tickseed?
The name “tickseed” comes from the plant’s small, oval seeds that resemble ticks. Despite this unusual moniker, coreopsis is a beloved garden staple known for its cheerful blooms and easy care.
Frequently Asked Questions
How do you keep coreopsis blooming?
Regular deadheading and midsummer pruning encourage continuous blooming throughout the season.
What are the best conditions for coreopsis?
Coreopsis thrives in full sun and well-draining soil with a neutral pH.
What is the best fertilizer for coreopsis?
A balanced, slow-release fertilizer applied in spring is ideal. Avoid over-fertilizing to prevent excessive foliage growth.
How do you manage coreopsis?
Maintain coreopsis with regular deadheading, occasional pruning, proper watering, and dividing perennial varieties every 2-3 years.
Conclusion
By following these comprehensive care instructions, you’ll be able to enjoy a vibrant display of coreopsis in your garden or containers. These hardy, colorful plants will reward your efforts with months of cheerful blooms and attract beneficial pollinators to your outdoor space, making them a valuable addition to any garden.
