Cordon

I couldn't help but notice that you have polished gravel covering your soil. Is this gravel glued on? because if it is you should probably scrape it away. It really interferes with the watering of your tree. I know this has nothing to do with you question, but I thought I should point it out. Many mass prodused bonsi trees come with gravel glued over the soil, to prevent damage during shipping. Fukien Tea is a commonly mass produced bonsia. If I'm incorrect in my guess, then just ignore me. Thought I should mention it, it could save your tree.

cheers
Cord