Grey spidery webs hang from oak trees in southern states. The locals call it Spanish moss. It is neither Spanish nor moss! The plant is an epiphyte, meaning that it grows on another plant or structure, but does not take any nutrients from that plant. Spanish moss is a bromeliad related to the pineapple family. Bromeliads take their moisture and nutrients from the air rather than the soil.
See the pictures and read more at: https://www.bromeliads.info/spanish-moss/