It has possibly become rootbound. What is its history of being repotted into a bigger pot and/or pruning the roots?
…and welcome to the Forum.
my first guess is the container is way too small
Meyer lemons are very difficult to grow if they have to be moved. Pots size need to have 1/4 the volume of its canopy.
Typical Meyer lemon down 80% of its leaves seen above.
Typical Fukushu kumquat has most of its leaves.
Yes I grew one in a tall 20g it’s was over 10 year. Root prune and replenish soil often. Shaded in hot summer heat. Still looked terrible 1/4 year but flourished the rest and produced tons of flowers with only about 15 lemons. I finally gave it away.
However will never get me to give my Fukushu away. The best kumquat I’ve ever tasted. I love it. Sweet n sour candy treats.
Amy, That’s a fairly happy Meyers tree. They like a lot of food and nutrients in containers.


