Keeping weeds abated and a well-trimmed lawn helps keep the HOA looking nice and attractive. If you are single family home, you are responsible for both the front and back yard to maintain. If you are a town home you are responsible to keep the backyard maintained from weeds and any bushes trimmed or grass mowed. Also please clean up after your pet in your back yard frequently. It does not take much pet waist for the smell to travel to your neighbors from the heat of the summer.