help! I am killing a tree

help! I am killing a tree

Hello - I am renting an apartment from an actor, and they have a small tree as a houseplant. I think I am drowning this tree but I am not sure. I see its leaves curling and my automatic reaction is to water it. The tree sits in a pot with a plastic base. I've frequently seen water rising just to the level of the plastic base - i.e., nearly enough water to overflow out the bottom, but not quite. Tonight the tree's leaves are all curling and it looks very decrepit and sad. I haven't watered it all day. At the base, I can still see some water. Even though I want to water it again, I feel that this is very much a bad idea, as the tree already has water to spare, as far as I can tell. Is it possible or likely that I am drowning the tree? Top of tree: Full view: Just to confuse matters, that smaller "plant" in this second picture, nearer the ground, is actually a fake plant. Also to confuse matters, I've gone away a couple times and forgotten to take care of the plant. I just completely forgot. But during that time, I don't think the plant looked quite as bad as it looks now. I think I've been overwatering it recently and it survived better when I was underwatering it. Anyway, help me out, I'm totally killing this tree. How do I figure out the right amount to water it?
new room need help asap.

new room need help asap.

pond

pond

Weeds?

Weeds?

Fall is on the way

Fall is on the way

Here is another photograph!

Here is another photograph!

Over wintering rosemary – or trying to

Over wintering rosemary – or trying to