My lemon tree has no fruit.
Certified GKH Gardening Expert
A number of things can attribute to this, with low phosphorus being the most common. Using a high phosphorus fertilizer or adding bone meal to the soil normally helps with this. For additional reasons for no lemon fruit, this article will help: https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-not-fruiting.htm