Lawn tech for long summer days

Mid-summer is a time to refresh the lawn with a new watering regiment, touch up your garden, and go ballistic on weeds. These high-tech tools will make those jobs easier. You can clean up your yard and save the planet at the same time with a battery-powered blower. A sheet of seeds (say that three timers fast) means no weeds to pull. Which gadget will make you a lawn pro?