Hi there, I'm new to the forum and to growing citrus. We recently
rescued a dwarf Meyer lemon from a neighbor. The previous owner kept it
indoors in a south facing window. Unfortunately, it was terribly
over-watered when we received it and the tree was planted in a too
large, non-permeable container. Although it had a few (unripe) lemons,
the tree had barren branches, mottled yellow leaves, and was dropping
leaves frequently.

We gently re-potted the Meyer lemon in a cactus soil mix within a
smaller terracotta pot and placed it in a south facing window. When the
plant was re-potted, the roots appeared to be healthy, firm, and white.
After re-potting, the plant continued to drop leaves for about two
weeks, but eventually stabilized and began to exhibit new leaf growth.
We were happy to have turned a corner!

We water the Meyer lemon weekly, testing the soil with our finger to
check the moisture level. Three weeks ago, we fertilized the tree with
Jobe Organics Fruit and Citrus Fertilizer (3-5-5) by sprinkling 1/8 cup
on the soil and misting with water thoroughly after the application. The
tree has been watered twice since then, about once a week, on the same
watering schedule as before. Within the last week, however, the tree's
remaining leaves have begun to look sickly and turn mottled yellow and the tree looks dramatically
worst.

Any helpful advice would be most appreciated. What should we do to save this tree?

Thanks very much,

Matt