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