Pull dandelions from lawns and gardens while they're small, before they produce a taproot and set seed. Once the taproot has formed, you must remove all of it to get rid of the plant, since new plants can sprout from even a small piece. A special dandelion weeder with a forked blade is helpful. For chemical control, use a selective post-emergence herbicide containing MCPA, MCPP, and dicamba in spring or fall. It spreads by seed and by rooting stems.
Control is difficult.
Cut the shoots back and cover the area with a dense mulch, such as several layers of landscape fabric, for several growing seasons. Back to top Yellow nutsedge. The flower head is golden brown. For chemical control, try glyphosate, being careful not to get the chemical on desirable plants. Back to top Yellow oxalis.