Large-flowered Tickseed
Coreopsis grandiflora
Updated Mar 29, 2026
Large-flowered Tickseed (Coreopsis grandiflora), also known as Golden Tickseed, is a sun-loving perennial with bright daisy-like flowers that thrives in full sun and fast-draining soil.
About Large-flowered Tickseed
Large-flowered Tickseed is a bright, long-blooming perennial grown for its golden daisy-like flowers and easy garden presence. The blooms rise above a tidy clump of foliage on slender stems, giving the plant a light, open look that adds color without feeling heavy or crowded.
It works especially well in sunny borders, cottage-style plantings, gravel gardens, and larger drifts where repeated flowers create a warm, glowing effect. Rather than relying on a short burst of bloom, Large-flowered Tickseed can keep a planting lively for weeks when conditions suit it.
Part of its appeal is that it combines a cheerful appearance with a tough, unfussy growing habit. It handles summer heat well, copes with short dry spells once established, and responds well to simple grooming. In favorable sites, it can even reseed, which may be welcome in relaxed, natural-style plantings.
How to Care for Large-flowered Tickseed
Watering
Water Large-flowered Tickseed regularly while it is establishing so the root zone settles in well. After that, switch to deep, infrequent watering and allow the soil to dry between waterings.
This plant performs better in dry-to-medium moisture than in constantly damp soil. During long hot spells, give it a thorough soak rather than frequent shallow watering, which keeps the surface wet without fully supporting deeper roots.
Sunlight
Plant Large-flowered Tickseed in full sun for the strongest flowering and the most compact growth. A bright, open position helps the plant hold a tighter shape and produce more blooms over a longer period.
It can survive in lighter shade, but flowering usually becomes less impressive and stems may loosen. If bloom count and sturdiness matter, sun exposure should be a priority.
Temperature
Large-flowered Tickseed handles warm summer weather very well, especially when the soil drains quickly. Heat on its own is usually not the problem; heat combined with wet soil is far more likely to reduce vigor.
In cooler periods, growth may slow naturally. At those times, avoid overwatering in an attempt to push faster growth.
Humidity
Low to moderate humidity with good airflow suits Large-flowered Tickseed best, although it is fairly tolerant when the foliage dries quickly after watering or rain.
In more humid conditions, give the clump enough space for air to move through the stems and avoid overhead watering when possible. If spotting or stress appears, improve airflow and water at the base first.
Soil
Use well-draining soil that lets water move through quickly and allows the root zone to re-aerate soon after rain or irrigation. Sandy or rocky ground is often especially suitable for Large-flowered Tickseed.
If your soil is heavy, improve drainage before planting. Gritty amendments or a slightly raised planting area can help prevent roots from sitting in lingering moisture, which is one of the main causes of decline.
Feeding
Feed lightly, if at all, especially in garden beds. Large-flowered Tickseed usually performs better without heavy fertilization, and too much richness can lead to softer growth and weaker flowering.
In containers, a modest balanced feed during active growth is usually enough. Even there, sun and drainage matter more than fertilizer.
Pruning & Grooming
Deadhead spent flowers to encourage more blooms and keep Large-flowered Tickseed looking neat. This simple step can noticeably extend the flowering display.
If the plant begins to look tired or flowering slows in mid-season, a light shear can refresh the foliage and help trigger another flush of bloom. Remove weak or damaged stems as needed to keep the clump open and tidy.
Pests & Problems
The most common issue is usually poor drainage rather than pests. When soil stays wet for too long, plants often lose vigor, thin out, or decline over time.
If Large-flowered Tickseed starts performing poorly, check watering habits, drainage, and sun exposure before assuming insects or disease are the main cause. A sunny, open site and slightly dry intervals between waterings prevent many recurring problems.
Overwintering
In many regions, Large-flowered Tickseed behaves as a hardy perennial when grown in a well-drained site. Leave cleanup until late winter or early spring if you want the plant to keep some natural cover through the colder period.
As new growth begins, cut the old stems back. In areas with wet winters, the most important protection is not extra covering but sharp drainage around the roots.

