One is planted in a lawn area and the other in a rock landscape with a mulched area approximately 6ft. in diameter. Both are doing well with numerous large plums growing. The one in the lawn area has about 25% small yellow plums that fall off when I flick them or shake the branches. The remainder of the larger plums look great. Is this tree getting too much water or is this a natural thinning process going on?
A. The yellowing fruit is a sign of a lack of pollination and they fall off naturally. Usually called “June drop” in some texts. I have some good pictures I can include later of plum with poor pollination. Check back after May 1st.