Product Description
Coreopsis verticillata 'Zagreb' (25) Bare Root Plants
Common name: threadleaf Coreopsis
Easy to grow. One of the most loved perennials, C. 'Zagreb' is an excellent performer with bright golden-yellow flowers (a deeper yellow than 'Moonbeam') blooming from early through late summer. It forms an exceptionally bushy yet airy clump of fine, needle-like foliage on upright stems. 'Zagreb' can spread in the garden by rhizomes and self-seeding, particularly in moist fertile soils.
Coreopsis grows in dry to medium moisture, most soil conditions with good drainage, including sandy or rocky. It is tolerant of humidity, heat and drought. Plants may be cut back hard in summer if foliage sprawls or becomes unkempt. The verticillata species is particularly long-lived, has a longer flowering time, and demonstrates better drought tolerance than others in the genus.
Coreopsis is easy to grow, making it a good choice for beginners. One plant will provide you with long-lasting cut flower bouquets all summer long. Plants in the genus Coreopsis are sometimes called tickseed in reference to the resemblance of the seeds to ticks. Coreopsis is native to North America. Therefore, it is easy to grow, thriving in any well-drained soil and full sun. Once established, it is rather drought tolerant.
Royal Horticultural Society's Award of Garden Merit 2001
Pennsylvania Horticultural Society Gold Medal Plant -- 2020
Zones 4 to 9.
Full sun.
Plants reach 15 inches tall and 12 to 15 inches wide.
Growth rate: Moderate,
Low to Average Water Needs
Poor to Fertile Soil Quality
Bloomtime: Early Summer to Late Summer
Attracts Butterflies
Bee Friendly
Deer Resistant
Growth Rate: Medium
Border Plant, Container, Cut Flower, Drought Tolerant, Easy To Grow, Mass Planting
This award-winning cultivar of threadleaf coreopsis ( Coreopsis verticillata ), a North American native wildflower, is a perennial known for its delicate, thread-like foliage and vibrant golden-yellow flowers. Coreopsis v. 'Zagreb' is a favorite among gardeners for its long blooming season, low-maintenance nature, and versatility in the landscape. This extended blooming period provides continuous color and interest in the garden throughout the summer and into the fall.
Appearance and Growing Conditions Coreopsis v. 'Zagreb' typically grows in dense, bushy clumps, reaching a height of 1 to 1.5 feet and spreading about 1.5 feet wide. Its leaves are finely divided, giving the plant an airy and delicate texture. The specific epithet " verticillata " means "having whorls in reference to the leaves." The bright yellow, daisy-like flowers are 1 to 2 inches in diameter and bloom profusely from early summer to mid-fall. Deadheading spent flowers can encourage additional blooms and prevent self-seeding. Shearing the plant in mid-summer can promote a fall rebloom.
This cultivar thrives in full sun and well-drained soil. It prefers dry to medium moisture but is drought tolerant. Coreopsis v. 'Zagreb' is adaptable to various soil types, including poor, sandy, or rocky soils. It is also notably tolerant of road salt, making it a good choice for gardens near roadsides. This cultivar is particularly well-suited to hot and humid climates, making it a great choice for Southern gardens. In addition to being deer resistant, it is also rabbit resistant, which is valuable information for gardeners dealing with these common garden pests.
Plants in the genus Coreopsis are sometimes commonly called tickseed in reference to the resemblance of the seeds to ticks.
One of the most loved perennials, 'Zagreb' is an excellent performer with bright golden-yellow flowers blooming from early through late summer. It forms an exceptionally bushy yet airy clump of fine, needle-like foliage on upright stems.
Care Requirements Coreopsis v. 'Zagreb' is relatively low-maintenance and easy to care for. Here are some key care requirements:
- Sunlight: Plant in a location that receives full sun (at least 6 hours of direct sunlight per day). It can tolerate partial shade, especially in hot summer areas.
- Watering: Water regularly after planting until established, which typically takes about 6 weeks. To check if the plant needs water, stick your finger about 3 inches deep into the soil. If it feels dry, it is time to water. Once established, it is drought tolerant and only needs watering during extended periods without rain.
- Soil: Plant in well-drained soil. It thrives in various soil types, including sandy, rocky, and even clay soils.
- Fertilizing: Coreopsis v. 'Zagreb' generally does not require frequent fertilization. Amending the soil with compost at planting time is usually sufficient. You can fertilize once in the fall with an all-purpose fertilizer.
- Pruning: Deadhead spent flowers to encourage more blooms. Shear the plant in mid-summer to promote a fall rebloom and maintain its shape. Cut back in spring before new growth begins.
- Pests and Diseases: Coreopsis v. 'Zagreb' is generally pest and disease-free. However, slugs and snails may occasionally be a problem.
Uses in Landscaping and Gardening Coreopsis v. 'Zagreb' is a versatile plant with many uses in landscaping and gardening. Its vibrant golden-yellow flowers and delicate foliage make it an attractive addition to various garden settings. Here are some common uses:
- Borders: Its compact size and long blooming season make it ideal for borders.
- Naturalized Areas: It can be used in naturalized areas or wildflower gardens to add color and texture.
- Cottage Gardens: Its informal habit and charming flowers make it a perfect fit for cottage gardens.
- Containers: It can be grown in containers, adding a touch of color to patios and balconies.
- Mass Plantings: Planting Coreopsis v. 'Zagreb' in masses creates a stunning visual impact with a sea of golden-yellow flowers.
- Pollinator Gardens: It attracts bees and butterflies, making it a valuable addition to pollinator gardens.
Hardiness Zones Coreopsis v. 'Zagreb' can be grown in a variety of climates. See the table below for the hardiness zones where it thrives.
Zone Description 3-9 Thrives
Coreopsis v. 'Zagreb' is an excellent choice for gardeners of all levels. Its vibrant golden-yellow flowers, delicate foliage, and long blooming season, which extends from early summer to mid-fall, make it a standout plant. It is also low-maintenance and easy to care for, requiring minimal watering and fertilization once established. This cultivar thrives in a variety of soil types and is particularly well-suited to hot and humid climates.
The versatility of Coreopsis v. 'Zagreb' shines through in its various uses in the landscape. It can be incorporated into borders, naturalized areas, cottage gardens, and even containers, adding a touch of charm and vibrancy to any garden setting. Its ability to attract pollinators like bees and butterflies further enhances its value in the garden. Whether you are a seasoned gardener or just starting, Coreopsis v. 'Zagreb' is a reliable and rewarding plant that will bring beauty and life to your garden.
Other Details
The most important part of the plant is its root system. Healthy roots are the foundation of a healthy, vibrant plant. The type of plug container used is based on the specific needs of the plants. Perennials offered as bare root traditionally perform better when planted as bare root.Planted in a specialized mix, potted plants have well established root systems. Top growth stage will vary depending on the current life cycle and time of year when shipped. In Winter and early Spring dormant plants may be shipped. Dormant plants may be planted right away, even before the last frost date.
Most bare root varieties are field grown for at least one season, though Hemerocallis and Hosta are grown for two seasons. The bulk of the soil is removed during the harvesting process and the tops of most varieties are trimmed back to the crown. They are graded, packed in shredded aspen or sphagnum moss and stored in freezers until ready to be shipped.
See our Container Sizes and Bare Root Perennials pages for more information.
Plant information and care is provided in the Overview section, Plant Genus Page and general information is provided in the Planting Care & Guides. Additional questions can be asked on each Plant page.
Plant Spacing: Using the maximum mature spread or width of a plant to guide spacing, ensures space to grow to full size. To fill an area sooner, plant them closer together. Just remember, future thinning or transplanting may be needed.
Water: Keep a close eye on newly planted perennials, especially throughout the first growing year. Most early plant loss is due to too much or too little water!
