Strange leaf problem on meyer lemon
I'm asking this for friends, hopefully I can explain clearly enough.
They have a small meyer in a 2 gallon pot grown as a house plant- south facing with good direct light.
There are a few "old" leaves that look ok, but the issue is all new leaves that sprout immediately fall off while still tiny.
If you simply touch them they drop, while still green.
There are no aphids, spider mites or scale. Not sure what else it could be. They fert'd with high acid fert last summer which didn't help so they decided to lay of fert until required. No flower buds.
I couldn't see anything wrong with their practices. Do you? Thanks!