The study looked at how apple trees intercept rainwater in Beijing. They found that the amount of rain intercepted by the trees is related to the amount of rain that falls. When it rains more than 1 mm, the trees start to catch the rain, and when it rains more than 1.5 mm, the water starts flowing down the tree trunks. On average, apple trees catch 18% of the rain that falls on them, and they can hold up to 7.5 mm of rain before they can't catch anymore. The researchers also developed a new model to better understand how apple trees catch rain.