One of the things I'm good with is plants. I know to get a native tree, and the examples I gave were ones that were safe to specific species that they feed off- that's the kind of tree I meant. As for the chemicals, well, that's pretty easy, no different to don't use grey water to water fruit trees. I do want to do this and I know how to be safe about it. =D I figured my examples being feeding trees for both would have made people realise that's the kind of tree I meant. This happens to me a lot. >_>
By native tree I mean one native to the parrot. One it feeds off. No better way to make it happier than a native feeding tree full of toys, but it'd have to be a small one for me to be indoors. If anyone else does want to try this, well, a simple reptile UV light or other UV light can help the tree if it's meant to be outdoors and not getting enough light. Pruning does wonders, too, to encourage new growth.