Nutgrass, also called nutsedge, could easily be one of the top 5 nuisance weeds gardeners deal with in the garden and landscape. While we don't know that for sure, we do know that nutsedge is a very challenging weed to control.
In mid-March, many people use clover-themed decorations in preparation for St. Patrick's Day. Many gardens and landscaped areas are decorated with clovers too, especially with recent rains and mild temperatures in much of California.
Campers and hikers are often warned to avoid poison oak in summer by looking out for green plants with glossy leaflets of three. However, as weather cools, the appearance of the plant changes, making it more difficult to identify.