Lemon Tree Problems

Question

I have problems with my Lemon trees (Meyer) and they are as follows:

1- The Lemon trees bear lots of flowers, but when becoming a little lemon, it doesn’t last for long. The attachment to the branch loosens up and then eventually falls off.
2- I thought that the soil and the position of the plant were the problem so I bought another small lemon tree that had already few (well grown) lemons on it, planted in the front yard and, again, never seen lemon fruit since I planted it.
3- Very strange, the first Lemon tree that I planted was just about 1.5 m from a Dwarf peach that wildly bears enormous amount of fruit, another 2 m in line with the backyard lemon tree is another Guava tree that bears huge number of fruits every year. The other Lemon tree that I planted in the front Yard, just 1m (if not less) across my neighbor’s fence is a wild citrus tree (Mandarin). It wasn’t planted by him, never looked after it, it just grew by itself. It has become in a span of 1 year 4m high and enormous amount of mandarins on it, while my Lemon trees are 3 years old, same height and not bearing any fruit (as I said lots of flowers, just never continues the cycle).

MY in-laws’ neighbor has given me advice by buying manure and mix it up with water and water the Lemon trees. I did it and it has certainly livened up the trees but, again, plenty of flowers, reaches the stages of small tiny lemons and then fall off. I am absolutely baffled, and not sure what to do.

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Answer 1

Meyer lemons do go through a process of natural thinning, known as "June drop", but it seems like it's thinning all of them. Here is an article that outlines many reasons for this phenomenon you are experiencing. The article will ask you to evaluate your watering, fertilizing, and to conduct a pest inspection.
https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-fruit-drop.htm

Here are some other thoughts:

Are your trees in a warm location of full sun? Is the soil well-draining?

I would check the pH of your soil. Meyers prefer a pH between 5.5 and 6.5.

Maybe your trees are too young yet. Grafted lemon trees, which you usually get from garden centers, take 2-3 years to flower and set fruit. Meyer lemon trees grown from seed take 4-7 years to bear viable fruit.

For more information on growing Meyer lemon trees, please visit the following link:
https://www.gardeningknowhow.com/edible/fruits/lemons/growing-meyer-lemons.htm