Good question. a weed can be both, depending on the climate and species. Generally, in colder climates, there are less evergreen, or year-round weeds.
deciduous
evergreen
They are, believe it or not, evergreen!
It can be both deciduous and evergreen. It mostly depends on the species.
evergreen
evergreen
Deciduous
Evergreen
Evergreen.
Evergreen
Evergreen
Deciduous