Creeping buttercup

Creeping buttercup has three leaflets and produces shiny yellow flowers.

Botanical name: Ranunculus repens

Family name: Ranunculaceae

Overview

Creeping buttercup

Creeping buttercup.

Buttercup species are tolerant of wet soil conditions, and so are often found in soils that are poorly drained. The creeping buttercup is the only buttercup species commonly found in New Zealand which has a stolon system. As with white clover, the stolon system allows creeping buttercup to spread laterally quite quickly into nearby weed-free areas.

It is frequently found in poorly drained lawns, pastures, waste areas and orchards, and also sometimes in crops and gardens. It often becomes quite troublesome in pastures grazed by cattle or horses, as they tend to avoid grazing the weed, unlike sheep.

Distinguishing features

Buttercup leaf comparison.

Comparison between the leaves of the creeping buttercup and the giant buttercup.

As with white clover, the leaves of creeping buttercup are composed of three leaflets, though these leaflets are much different in shape to those of clovers. The central leaflet tends to have a longer stalk than the other two leaflets, whereas the leaf of the giant buttercup, which is another very common buttercup that does not have leaves divided up in this way.

Although the stolons are a distinguishing feature of the creeping buttercup, they often disappear over winter making creeping buttercup difficult to differentiate from a very similar-looking annual weed called hairy buttercup. In spring and summer, it has the typical buttercup flower with shiny yellow petals.

Control

Creeping buttercup flower.

Creeping buttercup flower.

Creeping buttercup is commonly found in the herbicide strips of orchards and in waste places because it is tolerant of amitrole, simazine and low rates of glyphosate, all chemicals commonly used in orchards and waste places. Its growth form makes it tolerant of mowing too, so it grows in the mown grass strips between rows of trees, and grows laterally into the sprayed strip, as does white clover.

Rates of glufosinate or glyphosate that are not too low can give reasonable control in orchards, as can residual herbicides based around diuron. In pastures, either MCPA or flumetsulam can be used to remove it, and most turf herbicides kill it successfully in lawns, especially those based on MCPA.

In recent research conducted at Massey University, we found that simply ploughing a paddock with no use of herbicide to regrass a paddock does not kill this species very well at all. Even after secondary cultivation to prepare a good seed bed, buttercup leaves are often the first foliage that pop up in the new pasture from old stolons that haven’t died, and creeping buttercup will be worse in a new pasture than the former pasture following regrassing without herbicide assistance. 

The use of reasonable rates of glyphosate to assist with killing the old pasture will help prevent this from happening, and MCPB or flumetsulam in the new pastures will kill off seedlings before they get too established and set up the next population of creeping buttercup.

Similar species

Creeping oxalis

Creeping oxalis has three leaflets on each leaf and forms dense mats in lawns.

Creeping oxalis stem. Creeping oxalis stem. Creeping oxalis stem. Creeping oxalis stem.

Creeping speedwell

Creeping speedwell grows as dense mats in lawns and has lilac flowers.

Creeping speedwell in flower. Creeping speedwell in flower. Creeping speedwell in flower. Creeping speedwell in flower.

Giant buttercup

Giant buttercup grows in clumps and produces shiny yellow flowers.

Giant buttercup. Giant buttercup. Giant buttercup. Giant buttercup.

Hairy buttercup

Hairy buttercup produces shiny yellow flowers and has sepals below the flower petals that point downwards.

hairy buttercup hairy buttercup hairy buttercup hairy buttercup

Parsley piert

Parsley piert is a small weed that grows commonly throughout New Zealand.

Parsley piert Parsley piert Parsley piert Parsley piert

White clover

White clover has a stolon system and its white flowers have clusters of many florets.

White clover in flower. White clover in flower. White clover in flower. White clover in flower.