what are you fertilizing with, and how often?

I am not using any fertilizer. In our area, currently, temperatures are above 90s. I am watering it every week.

Attaching some more photos

Isn't it normal for citrus to drop 2+ year old leaves? Idk Ive only had citrus for a few years and my experience is more with other kinds of plants.

If you are not fertilizing at all, I would say your trees look pretty good. Give them a good shot of a good citrus fertilizer at the dripline, they will likely look even better.

I need advise, please . I grew a lemon tree from a seed... It is 4-5 years old, it has big thorns and never bloomed, consequently no lemons. Last year, somebody suggested that I should graft the tree that it may be wild. I brought few branches from a beautiful lemon lemon tree and I tried myself to graft it by watching some clips. It didn't work. Until then it was a healthy tree, now it is sick and I can see that in the leaves. When I grafted the tree, I used a waxed tape to protect the cuts, but it was raining and the branches got a black mold. I treated that mold with a spray, but I think it may have either weakened the tree immunity or got into its system, because since then, there were all kind of problems. I think that I damaged my own tree..I would appreciate any good, knowledgeable advise I could fallow.

I don't see any diseases. I see instead, micro-nutrient deficiency first pic or salt burn. Some chewing damage or just physical, like wind blowing the leaves against the thorns, second pic. Possible leaf miner damage in the third pic, and the last two pic look like sunburn.

Your tree isn't really that bad, and I doubt it will die from any of this kind of damage. You may need a better fertilizer though.

BTW, 4-5 years isn't long enough for a seed grown lemon to flower or fruit. More like 8-10 years will be the time frame. And if you prune your tree in that time it will take even longer. You just need to wait more.

Also, you will get more responses to your question if you start your own thread. Plus you can track answers on your email if it's your own thread.

Thank you so much for all the comments. I do not know how to start a new thread. I tried but I couldn't figure out how. My tree leaves have a worm since this spring. It can be seen in the 3rd picture. I pull the rest of the sick leaves so they would not contaminate the rest of the leaves. I sprayed the leaves with a whole bottle in the spring, it it wasn't efficient obviously. Yes, I saw some salt on one of the leaves in the 6th picture. What does this mean? Is there too much salt in the soil, or what?

In my research on line I found out about fertilizer that has phosphates, so I applied some recently. I also read that the yellow spots may be the cause of Mg and Zn deficiencies. How often should I use fertilizer? I water the tree every day. Is that wrong?

Thank you so much for your help.