Also called prostrate knotweed, knotweed is a summer annual characterized by its ability to grow in compacted areas, like gravel roadbeds, sidewalk edges, paths or sports fields. The root system of prostrate knotweed is extremely fine and can grow in the most compacted soils. This weed grows low to the ground forming mats, which is why it sometimes gets confused with spotted spurge. Tough, wiry branch stems are covered by small, oval, blue-green leaves. The extensive branching gives it a zigzag appearance. When stems or leaves are broken, it produces sap that is clear, not milky. Prostrate knotweed blooms from May through November, producing pinkish-white flowers.
Prostrate knotweed is tricky to control. First, you have to create unfavorably conditions for the weed. Relieving soil compaction is most important. You can do this by using a spading fork or a pitchfork for smaller areas. For larger areas, you may have to rent a machine called a core aerator. Another solution is to use broad-leafed herbicides when you first start seeing signs of prostrate knotweed growing. Our professionals have a 2 4-D and MCPP herbicide that can effectively control your prostrate knotweed problem.