OK, so this is not the most interesting post ever, but I do need some help!
I'm looking after my neighbour's bonsai tree for six weeks or so as she'll be away frequently and is having a lot of work done on her house. It's a very special wee tree, she got it for a significant birthday some time ago.
I've had it for two weeks so far, and the leaves are going yellow from the bottom up, and dropping off. I did forget to water it for the first whole week (I'm rubbish with plants!), then I overcompensated for a few days, it was at this point the yellowing started. Since then I stopped watering it again (spoke to neighbour and mentioned yellowing, she thought maybe too much water - I didn't admit to forgetting watering it at first) but the yellowing is getting worse since I cut back on water and it's lost lots more leaves.
It's on a South facing windowsill, so getting light but not direct sunlight.
Anyone know what's going on and how to fix it? Thanks