I bought this BloomRite "elephant's foot" (bonsai ponytail palm) ten to fifteen years ago from a store long-since-closed in Half Moon Bay, CA. Wonderful plant! I water it once a week in a drain rack on the kitchen sink. But the palm has gotten heavy and is tilting. And the material (moss?) around the trunk is pulling away from the trunk, exposing the roots or at least the bottom of the trunk. Currently the palm is in a beautiful Japanese-themed wooden container, with a plug at the bottom. The top is mostly little pieces of gravel that seem to be glued down. (The gravel has not fallen apart at all, even after all this time.) Around most of the trunk is something like "moss" though a bit of the gravel comes right up to the trunk. Even if I straighten up a trunk with a large rock, there's still "moss" missing around the trunk and holes to beneath the trunk. I guess the "moss" has settled.
What do I do? And, most importantly, what sort of "soil" do I use? Is this "moss" a standard soil replacement? Do I need to change the dish?