 One of the questions that I get asked on a regular basis on my radio show is, what are we supposed to water in the morning, in the afternoon, or in the evening? Well, let's eliminate a couple of things first. You don't want to water in the afternoon because when it's high noon, you've got high evaporation. You also have a chance for the plants to get burned because the water droplets are sitting on those leaves and they act like little magnifying glasses.