Picture of miniataure buttercup weed8/7/2023 Lesser celandine has green kidney- or heart-shaped leaves. Post-emergence herbicides are most effective during early spring while plants are actively growing. Since plants can grow from tubers and small bulblets left behind in the soil, effectively removing an infestation by pulling or digging requires diligence and persistence. Photo by Lori Imboden, MSU Extension.īecause lesser celandine emerges late in the winter and goes dormant over summer, there is a relatively short window for control. Lesser celandine can spread via underground tubers. Marsh marigold is reliably distinguished by its lack of tubers. The flowers of marsh marigold feature yellow, petal-like sepals that may be fewer in number (five to nine) than the yellow petals (seven to 12) of lesser celandine. This can lead to confusion with another member of the Ranunculus family, the native wetland plant yellow marsh marigold ( Caltha palustris), which blooms in early spring. Lesser celandine thrives in wet conditions and is frequently found near water sources. When plants are removed from the soil, tubers are visible among the root mass. In late winter, the small (0.5–1 inch), green, kidney- or heart-shaped leaves of lesser celandine grow in a rosette (similar to a dandelion), and during March and April bright yellow, seven- to 12-petal flowers appear. Patches can form dense mats in shady turf or woodland areas. It can outcompete turf in moist, shaded areas and can exclude spring ephemerals from the forest floor. Its ability to form thick mats that choke out competitors makes it an unwelcome addition to our landscape. Lesser celandine, also commonly known as fig buttercup, is an attractive plant that was introduced from Europe as an ornamental. In the subsequent year, that patch has grown into a dense mat of the perennial weed lesser celandine ( Ficaria verna, formerly Ranucuculus ficaria). Last year, we had a small patch of weeds in our lawn that we did not address.
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