Hi, I'm in Marana too, small world. Anyway, it really depends on what you are trying to grow and what time of day it is getting the direct sunlight. If it is veggies, I put them in the spot of my garden where it only gets morning full sun in the summer (the time of the year changes the shadows too btw-what is looking like full sun now might be different come summer). If it gets too much direct sun in the afternoon of our crazy summers, it will burn. So, I'd say my veggie garden does extremely well in about 4-5 hours of direct morning sun a day. The shade starts creeping in about 2pm. Other plants such as roses like the full sun though or they won't bloom. Same with my bougainvillea-after transplanting it in full sun,the blooms went from a pale yellowish green (which I really liked) to a hot pink.