posted 6 years ago
1. Too much water. Particularly in the dormant season. Cut watering back significantly.
2. The brown leaf-tips are most likely salt damage. You need to flush the soil and wash as much of the salt through. If you've been using synthetic fertilizers, they are high in salt and that accumulates quickly in little pots.
Once citrus is established, most of those problems will go away, but for young trees, you've got to baby them.
"The rule of no realm is mine. But all worthy things that are in peril as the world now stands, these are my care. And for my part, I shall not wholly fail in my task if anything that passes through this night can still grow fairer or bear fruit and flower again in days to come. For I too am a steward. Did you not know?" Gandolf