Newly planted trees, shrubs, and perennials appreciate a gentle and thorough watering, but watering slowly by hand takes time. Instead, create a low-tech drip irrigation system using gallon-size plastic juice jugs. (They're sturdier than plastic milk jugs, so you can get a lot of us out of them.) Fill a clean jug with water and carry it to a planting. Poke a small hole into the bottom of the jug and set it beside a newly planted plant. Then loosen the lid slightly to release the pressure so the water drips out slowly toward the plant's roots, right where it's needed.