Oxeye daisy (Chrysanthemum leucanthemum) is a pretty little perennial flower that might remind you of Shasta daisies, with a central yellow eye surrounded by 20 to 30 white petals. However, don’t let this similarity fool you. This plant can quickly invade areas of the landscape, making it necessary for some oxeye daisy control measures.
Oxeye Daisy Perennials
The plant spreads aggressively by producing seeds and underground through spreading rhizomes, eventually finding its way into unwanted areas such as crop fields, pastures, and lawns. The average plant produces 1,300 to 4,000 seeds annually and a particularly vigorous plant can produce as many as 26,000 seeds that germinate rapidly when they land on bare soil.
Historically, there have been several attempts to legislate control of oxeye daisies. The Scotts, who called them “gools,” made the unfortunate farmer whose wheat fields had the most oxeye daisies pay an extra tax. Even so, the weed spread throughout the European continent and eventually found its way to the U.S., probably in bags of forage grass and legume seeds.
It now grows in every state in the U.S. Several states have made it illegal to sell oxeye daisy seeds and plants, but both are available on the internet and are sometimes included in wildflower mixes.
How to Control Oxeye Daisy
An important part of oxeye daisy control is pulling up or cutting down the plant before it flowers and produces seeds. The plants have shallow root systems and are easy to pull. Mow lawns that are infested with oxeye daisy perennials regularly so they never have a chance to flower. Mowing causes the leaves to spread outward and flatten, so that if you later apply an herbicide, the leaves have a broader surface area over which to absorb the chemical.
It’s easiest to control oxeye daisies when you combine cutting and pulling the plants with the use of herbicides. Look for herbicides with 2,4-D as the active ingredient. The product you choose should be labeled for use against oxeye daisy and safe for lawns. Spray in spring after the seedlings emerge and again in summer when the plants bolt and begin to form flower buds.
Oxeye daisies are poor competitors against a healthy lawn and garden. They stand little chance to gain a foothold when you water and fertilize your lawn regularly and mow often.
Additionally, a densely planted, well-maintained, and properly mulched flower garden can help shade out oxeye daisy seedlings.