There is little you can do to control how much shade or sunlight a garden bed gets. Sure, you can cut down a tree to let in more sun or build a pergola for shade, but you can’t adjust the tilt of the earth. To find plants that will thrive in your garden, you need to get a handle on how much sunlight reaches each bed throughout the day and in all four seasons. Fortunately, with good observation skills and perhaps a new app on your phone, you can gather all the information you need to choose plants that will grow well in your garden’s brightest sun, deepest shade, and all the partially shaded places in between.