Lesser Celandine: Identification and Control in Central Ohio

Updated June 2026 · Central Ohio Invasive Watch

Lesser celandine (Ficaria verna, also called Ranunculus ficaria) is a low-growing wildflower with bright yellow buttercup-like flowers that blooms in late February through March. It looks innocent enough in a garden, but in Central Ohio's floodplain woodlands, it has become one of the most aggressive invaders, smothering native spring wildflowers under dense mats of glossy leaves before they have a chance to emerge.

Identification

Lesser celandine is easy to spot once you know what to look for. The leaves are heart-shaped or kidney-shaped, dark green, and have a distinctive glossy finish. They stay low to the ground in tight mats, rarely growing more than 4 to 6 inches tall. In early spring, bright yellow flowers with eight to twelve petals appear above the leaf rosettes, resembling small buttercups.

The plant spreads by two methods: bulbils (tiny bulb-like structures) form in the leaf axils and drop to the soil, and tubers (small round storage structures) develop underground. Both can survive in the soil for months and sprout when conditions are right. This dual reproduction strategy is part of why it is so difficult to control once established.

Why It Is a Problem in Central Ohio

Floodplain woodlands along the Olentangy and Scioto rivers depend on a predictable rhythm. Native spring ephemerals, like trillium, hepatica, bloodroot, and Virginia bluebells, evolved to leaf out and flower in early spring while the forest canopy is still bare and sunlight reaches the forest floor. They complete their above-ground growth by mid-May, then retreat underground for the rest of the year.

Lesser celandine breaks this rhythm. It leafs out just as early as the natives, if not earlier, and spreads so rapidly that it forms complete ground cover before native wildflowers have time to photosynthesize. The dense mat blocks light, preventing sensitive species from gaining strength for the following year. Within just a few years of invasion, patches of lesser celandine can eliminate the native spring wildflower community entirely.

On the ground: Walk the floodplains of the Olentangy in March and you will see where lesser celandine has taken over. Where there should be a diversity of native wildflowers, there are only yellow flowers and glossy green leaves as far as you can see.

Lesser Celandine vs. Marsh Marigold

Central Ohio's native marsh marigold (Caltha palustris) also flowers early and has bright yellow petals, which leads to frequent confusion. The difference is worth learning, because marsh marigold stays in true wetland areas and does not spread like an invader.

Marsh marigold has larger leaves that are more rounded and much less glossy. Its stems are thick, hollow, and grow upright, often reaching 12 to 18 inches tall. It prefers areas that stay wet through spring and does not form aggressive ground-covering mats. Lesser celandine, by contrast, stays low, forms dense mats, and thrives in drier upland woodlands. If you find bright yellow wildflowers in March on a wooded hillside, it is almost certainly lesser celandine. If you find them in a seeping area or shallow stream, it is likely marsh marigold.

Control Strategies

Small Patches: Manual Removal

For patches smaller than a few square feet, careful hand-digging can work, but only if you remove every piece. You must dig at least 4 to 6 inches deep and carefully break apart the soil to find and remove all tubers and bulbils. Even small fragments will regrow. This method is time-consuming but effective for localized infestations, especially on private property where herbicide use is not preferred.

Larger Patches: Targeted Herbicide

For larger infestations, a targeted herbicide application in late winter is more practical. The timing is crucial: apply in late February through early March, before natives emerge. A common approach is a small-area treatment with an appropriate broadleaf herbicide (consult your local extension office for current recommendations and proper application methods). The early timing means the herbicide will kill the lesser celandine before it can block light from reaching the soil below.

Herbicide must be applied carefully to avoid harming desirable vegetation nearby. Because spring wildflowers are just beginning to emerge, the risk is real. Many volunteers prefer hand-removal for small patches and reserve herbicide for larger monocultures where natives have already been lost and recovery time allows new plantings to establish.

After Treatment: Monitoring and Replanting

Neither removal nor herbicide is permanent. Lesser celandine seed can remain viable in the soil for years, and new bulbils can arrive via water movement during floods. After treatment, monitor the site through the next two growing seasons. Where natives have been lost, replanting native spring ephemerals helps fill the gap and reduces the chances of re-invasion.

Frequently Asked Questions

How do I tell lesser celandine apart from marsh marigold?

Both have bright yellow flowers in early spring, but marsh marigold (our native) has larger, hollow stems and bigger rounded leaves, and it prefers truly wet areas. Lesser celandine has thin, solid stems, smaller heart or kidney-shaped leaves that are glossy and dark green, and a much lower, mat-forming habit. Lesser celandine spreads aggressively into woodlands; marsh marigold stays in wet spots.

Can I just pull lesser celandine?

Small patches can be pulled if you are very careful to dig out every tuber and bulbil, which are small round storage structures in the soil. Leaving even a few pieces behind will regrow. For patches larger than a few square feet, digging is usually not practical. Herbicide applied in late winter before it flowers is more effective for larger areas.

When should I treat lesser celandine?

The window is narrow: late February through March. Treat before native spring ephemerals leaf out (like trillium and bloodroot). Lesser celandine flowers early and covers the forest floor in dense mats by April. If you wait, you risk harming the natives you are trying to protect.

Why is lesser celandine such a problem in Central Ohio?

It carpets floodplain woodlands along the Olentangy and Scioto, leafing out and flowering well before most native spring wildflowers emerge. It creates a dense mat that blocks light from reaching the soil, starving hepatica, bloodroot, trillium, and other spring ephemerals that depend on that early-season light. Once established, it can eliminate these natives over just a few years.

What Now

If you find lesser celandine on your land or in a natural area you care about, start small. Identify it clearly, map the patches, and choose a control method that fits your scale and resources. Early spring, before natives emerge, is your only real window. The work is difficult and ongoing, but the alternative is watching one of Central Ohio's finest wildflower communities disappear. For more on the region's invaders, visit our full species guide, and for what to plant in cleared ground, see our native alternatives.

About the author

Central Ohio Invasive Watch is written by a small group of volunteers who spend their weekends pulling honeysuckle and replanting natives along the Olentangy and Scioto. We are not botanists by trade, we are the people doing the work, sharing what we have learned in the field.