I have had a small sprout of lemon tree (Eureka lemon, if I trust the label) for a few months, and for the past two it has been looking weak and sick.
In particular, it's not making new leaves (although it did grow a little) and the three existing ones appear sick and dry, with spots on them (see picture). At first, there was also some web-looking white fluff on them, although it seems to have stopped (for a while, I assumed a spider was building its web on the sprout).
I have tried using water enriched with nutrients (this one) for the past month, but it did not seem to improve.
What should I do — any idea?
I can try to get better photos if these ones are of too poor quality: my cellphone is sort of a shame in that regard.