One of the best things you can do to help your landscaping and garden thrive and grow is use mulch. Mulching locks in moisture -- great for summer droughts -- and can block out light to prevent weeds from growing. But instead of buying pricey wood mulch, use what you already have: grass clippings. Just remove fresh grass clippings from the lawnmower bag and mulch away. Not only does it help cool the soil and conserve moisture, it also adds nutrients. About 25 percent of the nutrients the grass removes from the soil will be redeposited if you mulch with grass.