Barbara Tokarska-Guzik, University of Silesia, Bugwood.org
Pineappleweed is both a summer and a winter annual and related to chamomile. In fact, it's often called wild chamomile and used to make teas or put in salads. However, it's also a weed that grows everywhere from roadsides to crop sites. It's a low-growing plant with greenish-yellow flowers in the shape of cones. When crushed, they smell like pineapples. It spreads by seed and can even thrive in areas like driveways and walkways.
Pull or hoe pineappleweed before it blooms to prevent further infestation in the area. In late fall or spring, apply a pre-emergent herbicide to the target area to prevent the weed from emerging from the soil. Because pineappleweed only reproduces by seeds from mature fruit, maintaining the area with low mowing or pulling the weeds at the first sign will keep them from coming back.