First you need to determine if you have full sun, partial sun, or full shade in the area you are considering. The best way to do this is to spend a day at home and note which areas come into sun and when, and when they are in shade again. Do this in spring when you have a realistic amount of sunlight, not in summer when the day is longest. Full sun means at least 6, but preferably 8 hours of direct sun each day. Sun loving plants can usually survive with less but will not bloom as much. Part sun and part shade plants prefer 3-6 hours of direct sunlight per day; however part sun plants can usually take more heat than part shade plants, which will want relief from strong afternoon sun. Full shade means zero to 3 hours of direct sunlight. These plants do NOT want total darkness but rather filtered, or indirect light, such as that provided by a deciduous forest.