I purchased an indoor Catlin Elm (Ulmus Parvifolia) roughly 7 months ago. The tree thrived until after I first pruned it- around 3 months ago. New growth has been much more sporadic, so there has been no reason to prune it since. I was sure I was pruning correctly, but I have not noticed any new buds sprouting where I cut the branch. I am also sure that I have been watering too much because the soil on top of the mossy mound around my tree has begun to sprout a white mold.
At first I watered my tree whenever it started to dry out, every 3-5 days; I read somewhere to never let a tree go completely dry. Then I read some articles and watched some videos about dunking the plant, which I tried three times and then decided it was causing the root ball to be too damp and from then on the moldy substance has started to spread further.
I've been reading up on HG on how to deal with this mold and have seen suggestions to remove the rocks and also the tree from the soil and to re-plant it in bonsai soil. I have no problem digging around to see if it needs transplanting. If my bonsai does needs transplanting:
1. Can I use the same pot the tree came in? There are two gorgeously-placed landscaping stones growing through the moss on top of the root ball that I'd like to keep intact as well (if possible).
2. Any suggestions of the best bonsai soil?
Please Help! I don't want this lovely tree to die!