A couple of reasons--first is when you enter something in Plant Files, it gives you a couple different checkboxes that represent different ranges of height and you have to choose the one(s) that are correct for your plant. Then you also have to consider that all plants of a given type aren't going to get to the exact same height, there's always going to be a range of heights that are possible. So let's say you have a plant that the tag says can get 3-5 ft tall, then you go into Plant Files and the height checkboxes that you can choose from are 1-2 ft, 2-4 ft, 4-6 ft, etc. The only way to cover your 3-5 ft range is to check off both the 2-4 ft and 4-6 ft boxes.