Large-flowered Tickseed (Coreopsis Grandiflora ‘Mayfield Giant’)

Plant: Table of Contents

Large-Flowered Tickseed (Coreopsis grandiflora ‘Mayfield Giant’): A Comprehensive Guide

Large-flowered tickseed, scientifically known as Coreopsis grandiflora ‘Mayfield Giant’, is a beautiful and versatile plant that can enhance the aesthetics of any garden or landscape. This plant is part of the Asteraceae family and is native to North America. Its striking, daisy-like blooms and adaptability make it a popular choice among gardeners and landscaping enthusiasts.

In this comprehensive guide, we will delve into the culture, uses, care, and maintenance of the large-flowered tickseed. We will explore its water, sunlight, fertilizer, soil, pruning, propagation, container gardening, common diseases, pest management, as well as some fun facts and botanist’s tips. By the end of this guide, you will have a deep understanding of this beautiful plant and the knowledge to cultivate it successfully in your own garden.

What is Large-Flowered Tickseed (Coreopsis grandiflora ‘Mayfield Giant’)?

The large-flowered tickseed, also known as Coreopsis grandiflora ‘Mayfield Giant’, is a perennial plant that is admired for its abundant, impressive flowers and easygoing nature. It is a part of the Coreopsis grandiflora species and is a cultivated variety known for its larger-than-average blooms.

This variety is distinct for its sizable, golden-yellow flowers that bloom prolifically from early summer to fall. The plant has a bushy and compact growth habit, making it a valuable addition to garden borders, rock gardens, and containers. It typically reaches a height of 1 to 2 feet and a spread of 1 to 1.5 feet, creating a lovely, low-maintenance display of vibrant color.

Key Takeaways – Large-Flowered Tickseed (Coreopsis grandiflora ‘Mayfield Giant’)

Before we delve into the intricacies of large-flowered tickseed care and cultivation, let’s take a quick look at the key takeaways of this guide:

  • Plant Name: Large-Flowered Tickseed (Coreopsis grandiflora ‘Mayfield Giant’)
  • Family: Asteraceae
  • Common Name: Mayfield Giant Tickseed
  • Plant Type: Perennial
  • Bloom Time: Early summer to fall
  • Bloom Color: Golden-yellow
  • Height: 1 to 2 feet
  • Spread: 1 to 1.5 feet
  • Ideal Uses: Garden borders, rock gardens, containers

Now that we have a basic understanding of this beautiful plant, let’s explore its culture, uses, and the optimal conditions for its growth and proliferation.


Cultivating plants successfully often depends on understanding their specific cultural requirements. The culture of large-flowered tickseed encompasses various factors such as water, sunlight, soil, and more. Let’s explore each of these components in detail.


Large-flowered tickseed thrives in well-drained soils and can tolerate dry conditions once established. While it appreciates moderate moisture, it is essential to avoid overwatering, which can lead to root rot and other complications.

Watering Tips:

  • Water deeply but infrequently to encourage strong root development.
  • Allow the soil to dry out between watering sessions, especially in hot and dry weather.
  • Consider using a soaker hose or drip irrigation to provide consistent moisture without excessive wetting of the foliage.


This plant is notorious for its love of sunlight and can thrive in full sun to partial shade. In regions with hot summers, providing some afternoon shade can help prevent stress and prolong the flowering period.

Sunlight Requirements:

  • Plant in a location with at least 6 hours of direct sunlight daily for optimal blooming.
  • In hotter climates, partial shade in the afternoon can prevent wilting and sunburn.


When it comes to soil, large-flowered tickseed isn’t particularly demanding and can adapt to a variety of soil types. However, it does best in slightly acidic to neutral soil with good drainage.

Ideal Soil Conditions:

  • Well-draining soil is crucial to prevent waterlogging, especially in winter.
  • Amending heavy clay soils with organic matter can improve drainage and fertility.
  • A soil pH range of 6.0 to 7.0 is suitable for healthy growth and blooming.


Large-flowered tickseed serves a multitude of purposes in gardens and landscapes, thanks to its striking appearance and adaptable nature. Whether grown in traditional garden beds or utilized in container plantings, this plant offers versatility and aesthetic appeal.

Garden Borders

The prolific blooming and compact growth habit of large-flowered tickseed make it an excellent choice for garden borders. It adds vibrant color and visual interest while requiring minimal maintenance.

Rock Gardens

In rock gardens or alpine plantings, the low-growing and hardy nature of large-flowered tickseed allows it to thrive alongside stones and gravel, offering a cheerful display without overshadowing other features.

Container Gardening

Due to its controlled size and attractive blooms, large-flowered tickseed can be cultivated in containers or pots, adding a splash of color to patios, balconies, or any outdoor space with adequate sunlight.

Pollinator Gardens

The nectar-rich flowers of large-flowered tickseed attract an array of pollinators, including bees, butterflies, and beneficial insects, making it a valuable addition to wildlife-friendly gardens.


Proper fertilization can promote healthy growth and abundant flowering in large-flowered tickseed. Using a balanced, slow-release fertilizer can help provide essential nutrients without overwhelming the plant with excessive fertilizer salts.

Fertilizing Tips:

  • Apply a balanced, granular fertilizer in early spring when new growth emerges.
  • Follow the package instructions and adjust the dosage based on the size and age of the plant.
  • Avoid over-fertilizing, as this can lead to lush foliage at the expense of flowers.


Pruning and deadheading can help maintain the appearance and longevity of large-flowered tickseed, ensuring a continuous display of blooms and a tidy overall appearance.

Pruning Guidelines:

  • Deadhead spent flowers regularly to encourage new blooms and prevent self-seeding.
  • Trim back the plant by one-third in late spring to promote bushy growth and prolong flowering.
  • Remove any dead or damaged foliage throughout the growing season to maintain plant health.


Large-flowered tickseed can be propagated through various methods, offering opportunities to expand your plant collection or share it with fellow gardening enthusiasts.

Propagation Techniques:

  • Division: Every 2 to 3 years, divide mature clumps in early spring to rejuvenate the plant and create new individuals.
  • Stem Cuttings: Take 4- to 6-inch stem cuttings in midsummer and root them in a well-draining potting mix to propagate new plants.

Container Popularity

The compact size and striking blooms of large-flowered tickseed make it a popular choice for container gardening. Its adaptability to container culture allows it to thrive on patios, balconies, or in any outdoor space with ample sunlight.

Container Care Tips:

  • Use a well-draining potting mix designed for outdoor container plants.
  • Ensure the container has drainage holes to prevent waterlogging.
  • Water and fertilize the plant as needed, considering the faster drying out of soil in containers compared to garden beds.

Common Diseases

While large-flowered tickseed is generally resilient, it can occasionally experience diseases that affect its overall health and appearance. Being able to identify and manage these diseases is essential for maintaining robust plants.

Disease Diagnosis

Powdery Mildew:

  • Symptoms: White powdery spots on leaves and stems, stunted growth, and distorted foliage.
  • Prevention and Treatment: Improve air circulation, avoid overhead watering, and apply fungicidal treatments if the infection is severe.

Root Rot:

  • Symptoms: Wilting, yellowing, and eventual collapse of the plant due to rotting roots.
  • Prevention and Treatment: Ensure well-draining soil, avoid overwatering, and consider using fungicidal treatments if root rot is detected.

Common Pests

Large-flowered tickseed is relatively resistant to pest infestations, but it can occasionally encounter a few common garden pests that may impact its growth and flowering.

Common Pests


  • Identification: Small, soft-bodied insects clustering on new growth, causing leaf distortion and honeydew secretion.
  • Management: Prune affected growth, apply insecticidal soap, or introduce natural predators such as ladybugs or lacewings.

Spider Mites:

  • Identification: Tiny arachnids causing stippling and webbing on the underside of leaves, leading to reduced vigor.
  • Management: Increase humidity, regularly wash the foliage, or use natural predators like predatory mites.

Botanist’s Tips

As a plant scientist and enthusiast, here are some additional tips and insights to help you cultivate and appreciate large-flowered tickseed.

Fun Facts

  • Large-flowered tickseed is a native wildflower in several regions of North America, especially in open woodlands and meadows.
  • The name “tickseed” is derived from the shape and coloring of the seeds, which resemble the common wood tick.

Botanist’s Insight:

“The resplendent blooms of large-flowered tickseed not only attract human admirers but also provide a valuable food source for pollinators, contributing to the ecological health of the garden or landscape.”

Links to External Resources

For further information and resources on large-flowered tickseed, I recommend exploring the following links:

  1. Growing Coreopsis
  2. Perennial Tickseed
  3. All About Coreopsis

As you continue your journey in gardening and plant cultivation, these resources can serve as valuable references and inspiration for incorporating large-flowered tickseed into your horticultural pursuits.

In conclusion, large-flowered tickseed (Coreopsis grandiflora ‘Mayfield Giant’) offers an array of benefits and aesthetic appeal for gardeners and landscapes. Its adaptability, striking blooms, and low-maintenance nature make it a desirable addition to diverse gardening scenarios. By understanding its cultural requirements, uses, and maintenance guidelines, you can cultivate healthy, vibrant specimens of this delightful plant and create stunning displays of golden-yellow flowers in your outdoor spaces.

Whether employed in garden borders, rock gardens, containers, or wildlife-friendly plantings, large-flowered tickseed holds the potential to elevate the beauty and ecological value of your garden. Embrace the charm and resilience of this perennial favorite, and immerse yourself in the joy of nurturing and appreciating the captivating blooms of the Mayfield Giant tickseed.

So, why not consider adding this exquisite plant to your garden and experiencing the joy it brings throughout the growing season? With the right care and attention, large-flowered tickseed is poised to thrive and enchant observers with its radiant flowers and cheerful presence.

Picture of Peter Taylors

Peter Taylors

Expert botanist who loves plants. His expertise spans taxonomy, plant ecology, and ethnobotany. An advocate for plant conservation, he mentors and educates future botanists, leaving a lasting impact on the field.