I have a problem with my citrus sapling. This one is about two years old (!?!?) and I planted it myself from a seed out of an ordinary lemon or orange (can't remember which :p ).
During the winter months I kept it inside and it continued to do well. However when the weather turned for the better and I put it outside for it to enjoy the full sun it went downhill (I still brought it indoors every evening).
Over the course of a few weeks all the leaves turned grey/whitish and growth seized. It didn't have this problem when I put it outside the first summer.
This started a few months ago, but I didn't want to give it up so quickly so I left it outside still.
However today to my great surprise I noticed the growing tip beginning to form new leaves again. And weird: at the base of the petioles more down the stem there are new stems forming. I didn't know a tree plant this young was capable of doing that!?