2. Take the hard work out of irrigation. A big mistake people make when they install a garden: thinking they can go out once or twice every other week and just hose it down for a few minutes, and that's enough water for the plants. It's really not. It's recommended that you get a simple drip irrigation system. It can be attached to a water faucet with a timer; simply set the timer, and it gives the plants all the water they need.