Hi spice girl and welcome...

One of the things that everyone forgets to do is take an up close picture of their mix in the pot. Can you do that?

Also, what is your mix made of? How long does it stay wet?

Mike:-)

Water softeners replace minerals with Sodium Chloride (table salt); it is too common that people water plants with water that has come thru the water softener... stop it; the salt will kill the tree... and other plants as well.
You likely moved your Meyer directly from outside to inside. Meyers are sensitive to significant light change and will drop leaves to replace them with new leaves better suited to the new light. In the future move the tree from full sun to partial sun; after 2 weeks move it to full shade; and after another 2 weeks to inside. Reverse the process in the Spring. I would not re-pot a stressed tree; wait until you put it out in the Spring. 2... skip the rocks. 3... perlite, never vermiculite. Your leaves have good color, so you are probably giving it what it needs in fertilizer.

There is nothing wrong with your tree. Falling leaves from citrus is quite common at this time of year, and for the next month depending where you live. The leaves in question are just old leaves that have lived out their life span A citrus leaf has a life span of 20 - 24 months. If you look at the leaves you can even see where the tree has pulled back out most of the remaining nitrogen from the leaves so that the nitrogen can be reused before the old leaves are discarded. When an older citrus leaf can no longer accomplish it full required work task for the tree it is quickly discarded. There is no welfare program for an old leaf. Adding gravel, rocks, or other such material, does NOT help with the container's drainage. It actually hurts the drainage, because the layer of rock only raises the perched water table even higher into the container's growing area. There a all types of mediums that a container citrus will grow well in. Just be sure that it has good drainageand good aeration. The number one potting mix world wide for container trees is 5 parts conifer bark, 1 part coarse sand and 1 part peat moss. It is used by most every commercial nursery in the world. This forum has two favorite mixes that they seem to use. Personally, I have never use them, but for small trees in small containers they seem to work. Good luck to this tree. - Silica

So Spicegirl...How's it going?

Is your tree doing any better than when you first asked?

Hoping so:-)

Mike

Hi Mike,

Thanks for checking in.

The trees are holding their own. We stopped using softened water, which I think was the easiest and most important step. And, we'll be more mindful when it comes to moving them from inside to out and vice versa.

Will check in as time goes on.

Thanks to you and all!

SG

I'm so glad that John brought that up. It's great to see you learn from such good people here.

Mike:-)

That yellowing is not normal and definitely looks like sodium toxicity to me.