What is causing most of the flower buds on my coffee plant to abort? This happened last year, when the tree flowered for the first time, and again this year. They reach the size of a grain of rice before drying and turning brown. The trees are fertilized monthly and put on regular, healthy growth. The leaves are lush green, without a brown margin, which means humidity is at an acceptable level. (Levels are usually well above 50%.) Last year I thought it may have been caused by a lack of moisture on occasion so this year I made sure the soil is always kept sufficiently moist. Could this problem be normal for a young tree - it's about six years old?