In August of last year I bought a kit from a store and my bonsai has been growing wonderfully since then. But recently, I believe around December, it started to die. Right now about half of its...I guess branches are dry and withered while the others are green. It's a Japanese black pine. I've been watering it the same as I have been since I bought it. Though I'm afraid there was a time where I neglected it for a little and I'm worried that it's the reason it's dying.
My mom thinks that giving it a little more soil will help, since the soil the kit came with, seems to be insufficient. She also thinks vitamins will help.
If anyone has any tips please let me know. Thank you!