u/dkskeksmsmmsmsms

This stuff is popping up all over my newly planted grass seed area. If crabgrass, should I be pulling it as it’s coming up or wait and treat with something?

Some of my arborvitae’s are 10’ taller than the rest and all on the back side were planted around the same time. Is this normal? The ones closest to the house do get some rain water runoff from the roof.