Threadleaf Coreopsis Coreopsis verticillata 'Zagreb'
ABOUT
Coreopsis verticillata 'Zagreb', commonly known as Threadleaf Coreopsis or Whorled Coreopsis, is a perennial plant that is admired for its finely textured, needle-like leaves. These leaves are arranged in a whorled fashion, creating a delicate, fern-like appearance that is dense and bushy. The foliage is a vibrant green, providing a lush background for the star of the show: the bright yellow flowers. The flowers of the Zagreb cultivar are particularly striking, with a golden-yellow hue that effortlessly captures the essence of summer sunshine. Each bloom features a series of daisy-like petals that surround a darker yellow center. These flowers are profuse and tend to cover the plant, creating a bold, eye-catching display that can brighten any garden space. These blooms are not just beautiful to look at; they also attract various pollinators such as bees and butterflies, adding to the dynamic life that this plant supports in the garden. Overall, the Threadleaf Coreopsis 'Zagreb' showcases a harmonious balance between its fine foliage and radiant floral display, making it a popular choice for gardeners looking to add a splash of enduring color to their landscapes.
About this plant
NamesFamily
Asteraceae.
Synonyms
Threadleaf Coreopsis, Whorled Tickseed, Zagreb Tickseed, Thread-leaved Tickseed, Threadleaf Tickseed.
Common names
Coreopsis verticillata 'Zagreb'.
ToxicityTo humans
Threadleaf coreopsis, generally considered a non-toxic plant to humans, does not pose a significant poisoning risk upon ingesting its parts. There are no well-documented symptoms of poisoning because it is not commonly associated with toxicity.
To pets
Threadleaf coreopsis is also generally recognized as a non-toxic plant to domestic pets, including cats and dogs. As such, it typically does not cause poisoning and there are no expected symptoms or consequences from the ingestion of any part of the plant by pets.
CharacteristicsLife cycle
Perennials
Foliage type
Deciduous
Color of leaves
Green
Flower color
Yellow
Height
1-2 feet (30-60 cm)
Spread
1-2 feet (30-60 cm)
Plant type
Herb
Hardiness zones
3-9
Native area
North America
Benefits
General Benefits- Attracts Pollinators: Coreopsis verticillata 'Zagreb', commonly known as Threadleaf Coreopsis, is known to attract butterflies and bees, enhancing pollination in the garden.
- Drought Tolerant: Once established, it requires minimal water and can thrive in dry conditions, making it ideal for water-wise gardens.
- Easily Maintained: This hardy perennial requires little maintenance, is generally pest-free, and doesn't demand frequent fertilization.
- Long Blooming Season: It offers vibrant yellow flowers that bloom profusely from early to late summer, adding long-lasting color to garden beds.
- Deer Resistant: The plant is not a preferred food source for deer, which helps to prevent damage in areas with deer populations.
- Rapid Growth: It grows quickly and can fill in garden spaces, making it a good choice for ground cover or borders.
- Non-Invasive: Unlike some garden plants, Threadleaf Coreopsis tends not to spread uncontrollably, making it easier to manage.
- Soil Adaptability: It can thrive in a variety of soil types, from sandy to clay, as long as there is good drainage.
- Dividable: The clumps can be easily divided to propagate new plants and expand garden areas without additional cost.
Medical PropertiesThis plant is not used for medical purposes.
Air-purifying QualitiesThis plant is not specifically known for air purifying qualities.
Other Uses- Threadleaf coreopsis dye: The flowers can be used to create a natural dye for fabric, yielding a range of colors from yellow to rust depending on the mordant used.
- Garden structures: The sturdy, upright stems of threadleaf coreopsis can be used in constructing small garden fences or supports for other plants.
- Creative pressed flower art: The vibrant flowers of threadleaf coreopsis can be pressed and used in floral crafts and botanical art projects.
- Potpourri ingredient: Dried threadleaf coreopsis flowers can add color and a light, pleasant fragrance to homemade potpourri mixes.
- Natural confetti: The petals can be dried and used as biodegradable confetti for outdoor celebrations to avoid littering synthetic materials.
- Photography subject: The bright and cheerful appearance of threadleaf coreopsis makes it a popular subject for garden and macro photography.
- Educational tool: This plant's variety of pollinators can serve as an excellent educational resource to demonstrate the importance of pollinator-friendly gardens.
- Erosion control: The dense and fibrous roots of threadleaf coreopsis can help stabilize soil and prevent erosion in certain landscapes.
- Companion planting: Threadleaf coreopsis can attract beneficial insects to the garden when planted near vegetable plots, potentially improving pollination and pest control.
- Bird attraction: The seeds of threadleaf coreopsis provide food for birds in the fall, making it a useful plant for bird-friendly landscapes.
Interesting Facts
Feng ShuiThe Threadleaf Coreopsis is not used in Feng Shui practice.
Zodiac Sign CompitabilityThe Threadleaf Coreopsis is not used in astrology practice.
Plant Symbolism- Cheerfulness: The bright yellow flowers of the Tickseed (Coreopsis verticillata 'Zagreb') symbolize happiness and upliftment, similar to the way the sun lights up a day.
- Love: As with many flowers, the Tickseed can represent love, with its warm hues reflecting the warmth and affection in relationships.
- Optimism: The plant's resilience and ability to flourish in a variety of conditions suggest a sense of optimism and the ability to look at the brighter side of life.
WaterThreadleaf coreopsis needs regular watering when newly planted to establish roots but is drought tolerant once established. Water it deeply once a week, providing about 1 to 1.5 inches of water each time. During hot, dry spells, you may need to water twice a week. Use a soaker hose or drip irrigation to deliver water directly to the roots, avoiding overhead watering which can promote disease. Reduce watering in fall before the first frost to help the plant harden off for winter.
LightThreadleaf coreopsis thrives in full sun, meaning at least 6 to 8 hours of direct sunlight per day. It's important to plant it in a spot where it will receive ample sunlight to ensure the best growth and flowering. While it can tolerate light shade, too little sun can lead to fewer blooms and a leggy growth habit.
TemperatureThreadleaf coreopsis prefers a temperate climate and can typically withstand temperatures as low as -30°F and as high as 90°F. It is hardy in USDA zones 3 through 9. The ideal growing temperatures for this plant are between 60°F and 75°F. It is tolerant of high summer heat as long as it's not coupled with humidity.
PruningPrune threadleaf coreopsis regularly to promote bushy growth and more blooms. Deadhead spent flowers throughout the growing season to encourage continuous blooming. Cut back the plant hard in late summer or early fall after flowering has finished to rejuvenate the foliage. Once a year, in early spring or late winter, prune the plant down to about 4-6 inches to help maintain its shape and encourage new growth.
CleaningAs needed
SoilThreadleaf Coreopsis thrives in well-draining soil enriched with organic matter with a pH between 5.8 and 6.8. A mix of garden soil, compost, and a handful of sand to improve drainage would make an ideal soil environment for the 'Zagreb' variety.
RepottingThreadleaf Coreopsis, being a perennial, does not require frequent repotting. It is typically repotted or divided every 2-3 years to maintain vigor and manage its growth in the garden.
Humidity & MistingThreadleaf Coreopsis is adaptable and does not require specific humidity conditions; it tolerates the average humidity levels found in most outdoor garden environments.
Suitable locationsIndoor
Grow in bright light, well-draining soil, minimal water.
Outdoor
Plant in full sun, well-drained soil, water sparingly.
Hardiness zone
3-9 USDA
Life cycleThe life of Coreopsis verticillata 'Zagreb', commonly known as Threadleaf Coreopsis or Whorled Coreopsis, begins with germination, where the seed grows roots and shoots after being sown in well-draining soil with ample sunlight. The seedling stage follows, during which the plant develops its characteristic thread-like foliage and establishes itself in the garden. As it enters the vegetative stage, 'Zagreb' grows rapidly, forming a clumping mound of airy leaves. The plant then progresses to the flowering stage, typically in early to mid-summer, showcasing dainty, star-shaped, bright yellow flowers that attract pollinators. After pollination, the plant sets seeds in late summer to autumn, which can be collected for propagation or left to self-sow if conditions are right. Finally, the plant enters dormancy over winter, especially in cooler climates, with the foliage dying back before regenerating the following spring to repeat the cycle.
PropogationPropogation time
Spring-early summer
Coreopsis verticillata 'Zagreb', commonly known as Threadleaf Coreopsis, is most commonly propagated through division. The best time to divide this plant is in early spring or fall when the plant is not in active bloom. To propagate by division, carefully dig up the plant, ensuring a good amount of root is attached to each clump. Gently separate the clumps, either by hand or using a sharp knife, making sure each new section has roots and shoots. These new divisions should be replanted at the same depth they were originally growing, spaced approximately 15 to 18 inches (38 to 46 cm) apart to allow sufficient room for growth. Water the new divisions well to help them establish. This method is effective and ensures that the new plants will be true to the parent, maintaining its vibrant yellow flowers and delicate foliage.
