Pennyroyal
Pennyroyal
Pennyroyal is a creeping perennial weed with a stolon system and roots along the creeping stems that keep it secured to the ground.
This species, like many other stolon system weeds, can cause dense mats in turf.
During the vegetative stage, it can be confused with Speedwell, but simply crushing the plant will identify it from Speedwell as it has a mint aroma. It also has distinctive purple-blue flowers at the base of the leaves.
Control
Applying dicamba mixed with either 2,4-D or MCPA (Trimec and Legend) when the plant is actively growing in spring or autumn will provide control.
