A square stem weed is popping up (seemly overnight) in gardens and flowerbeds and shady areas around the yard. It is called bedstraw or catchweed. When you touch the weed, it feels sticky. This is because of the little Velcro-like hairs covering the plant. It clings to clothing and pets especially the seeds bringing them into the house.
Most “weeds” have a history of use which is forgotten in modern times. Early settlers used this weed to fill mattress pads thus the name bedstraw. Native Americans used this weed as a poultice for relieving insect bites and poison ivy. Apparently, horses, geese, and cattle love the stuff. Maybe that is why you do not find this weed in pastures.
One plant produces up to 400 seeds and remains viable for up to 4 years. Bedstraw can be easily pulled or even raked. 2,4-D easily kills it.