Tickseed, scientifically known as Coreopsis, is a genus of flowering plants popular among gardeners for its prolific, daisy-like blooms and extended flowering season. These resilient plants include both annual and perennial varieties, displaying bright colors, most commonly shades of yellow, pinks, and reds. Gardeners often seek plants that thrive in various conditions while also withstanding pressure from local wildlife, particularly where deer populations are high. The plant’s adaptability makes it a favorite choice for adding continuous color to a landscape.
Deer Resistance Rating
Tickseed is widely regarded as a highly resistant option for landscapes frequented by deer. Most resistance scales rate Coreopsis as “seldom severely damaged,” meaning deer will typically avoid it in favor of more palatable vegetation. This natural protection stems from the plant’s chemical composition and physical characteristics.
The leaves of Coreopsis species contain compounds that give them a slightly bitter taste, which is unappealing to deer. Additionally, the foliage often has a texture or scent that is not favored by these animals, acting as a natural deterrent. While no garden plant is absolutely deer-proof, Coreopsis is a reliable choice for minimizing browsing damage. For instance, species like Coreopsis verticillata (Threadleaf Tickseed) are known for their fine, dense foliage, which contributes to their high resistance rating.
Other Common Pests and Diseases
While deer tend to leave the plant alone, Coreopsis is still susceptible to a few common garden maladies that affect its overall health. The plant can suffer from fungal issues, most notably powdery mildew, which manifests as a white or grayish coating on the leaves and stems. This often occurs when plants are placed too close together, leading to poor air circulation or when humidity levels are consistently high.
Other fungal infections, such as leaf spot and downy mildew, can also appear, especially in damp conditions. Insect pests are usually minimal, but aphids and leafhoppers may occasionally target the plant. These small insects are a concern because they can transmit viral diseases, such as aster yellows or mosaic viruses, which stunt growth and cause yellow discoloration and malformed flowers. Prompt removal of infected plants is the only way to manage these incurable viral infections.
Strategic Placement in Deer Prone Areas
Leveraging the plant’s natural resistance through strategic placement can help ensure your Tickseed remains untouched.
Using Tickseed as a Buffer
Planting Coreopsis as a buffer around less resistant, more desirable plants can deter deer from investigating the inner garden. Creating a perimeter of highly resistant plants makes the entire area less inviting for foraging.
Placement Near Activity
Consider placing the Tickseed near structures or areas with high human activity, such as walkways or patios. Deer are naturally cautious and prefer to browse in quieter, more secluded parts of the landscape.
Companion Planting
Companion planting with strongly scented herbs, like lavender, sage, or rosemary, can further enhance the Tickseed’s resistance. The strong aromas of these neighboring plants can help mask the scent of any remaining appealing foliage, discouraging deer from lingering.