Hot spots for weeds

One way to get rid of weeds in cracks in sidewalks, driveways, and patios  is to pour boiling water on them. It may take two or three attempts over several days to kill perennial weeds completely with this method -- it depends on their type and size -- but it's inexpensive and not harmful to the environment. However, you'll want to wear closed-toe shoes, long pants, and long sleeves -- and be very careful.