Bulbous buttercup is a common perennial weed, also known as yellow weed, blister flower and St Anthony’s turnip. It can be found in grassy areas including turf, although it is not as common as creeping buttercup on garden lawns. It gets its name from its swollen underground bulb like stem or corm. Once the plant dies back at the end of the season, the corm survives in the ground into the following season.
The leaves are similar to other buttercups, as they form from a basal rosette. They consist of three leaflets that are heavily toothed.
The single, bright yellow flowers can be seen between April and July. Each flower has between 5 -7 petals and and when the flower is fully open the sepals face downwards.
Bulbous buttercup grows on light, free draining soils. It does not like wet soils.
- Hand weeding can prove effective, taking care to remove the whole plant.
- Encourage a healthy lawn with good lawn care practices, such as correct feeding and watering during drought conditions.
- Avoid letting this weed produce seed, by removing the flowers.
Bulbous buttercup is more resistant to weed killers than its creeping cousin. Choose a selective herbicide that contains fluroxypyr (Verdone Extra) for the best results. However a second application may be needed for complete control.