@meyermike Since I was not sure about the mite damage, I went to buy the pesticide for it and used it, but nothing has improved so far. It's been several weeks... @Tapla Yes, I usually measure the pH using the pH indicator from my lab. I always make sure it's around 5. I use the same fertilizer as the one I use for my Hydrangea. @meyermike Hah! So it might not be about the mites outside but inside the soil??? I didn't know there is no such thing? My gardenia's soil has never had the chance to hold water for too long though, because of the big hole underneath the pot everything went out. It took less than a week for the soil to be dry again. Now spring has arrived it is growing so many new leaves and flowers all over the place it becomes very hard for me to check everything. If I want to change the soil I should change it now right? Will it solve anything? If there are mites leaving on the roots, changing soil won't remove them right? I just notice something but the leaves of my gardenia never falls, like never ever. The oldest leaves look the worse. With all those yellow spot as shown in the picture. Please help. :

Gardenia, 'Veitchii' ? Here is a link that might be useful:

That is a selling name for one of the Keith Warren hybrids between Norway and Shantung maples - there is no involvement of Acer rubrum. Leaves of the tree asked about here need to be seen before sure identification - of the species or hybrid it represents - becomes possible. Naming it down to the cultivar level is another matter, not necessarily easily accomplished under these circumstances.

Hopefully you have gotten an answer by now. I suggested on another forum that you maybe take the lamp to an antique dealer who could 'maybe' give you some information.