Reasons for Flower Drop on Lemon Trees
Lemon trees are sensitive to changes in their environment. Sudden fluctuations in temperature or climate can lead to lemon blossoms falling off. Lemon trees grow best in a sunny, permanent site where they can actively grow year round. They require full sun for healthy bloom and fruit production and may drop blooms if they are placed in too much shade. Lemon trees are even less tolerant of frost than orange trees. Unseasonably cold spring weather in areas that normally stay warm may cause lemon blossom drop on outdoor trees. Frost nipped lemon blossoms and buds will turn brown and mushy, then drop from the tree. In cooler climates, lemon trees are often grown in containers and moved inside or out depending upon the weather. These potted lemon trees can be even more prone to lemon blossom drop or leaf drop because the frequent environmental changes they experience as they are moved in and out. Lemon blossoms falling off a potted lemon tree may also be caused by cool drafts, as well as under or over watering. A lemon tree dropping flowers may be a sign of drought or other changes in watering. When water is scarce, a lemon tree will drop flowers or fruit to conserve energy. Flooding, waterlogged soil or over-watering can also cause lemon blossom drop. Lemons grow best in a well-draining soil with regular irrigation, especially in times of intense heat and/or drought. Lemon trees are generally acclaimed for their ability to grow in poor, under-fertile soils. However, lemon blossoms falling off a lemon tree can be a sign of a potassium deficiency. Potassium is vital for flower and fruit set, and the overall health and vigor of all citrus trees. If you wish for healthy, high yields from your lemon trees, begin a fertilizing regiment in early spring with a fertilizer high in potassium or designed specifically for citrus trees.
