That’s delicate indeed…
Most of my trees are outside, apples, plums, peaches, ash, black locust. The ones inside, i divide them in no leafs and leafs.
The one that have no leafs , Anna Paulownia, is inactive, i believe too much water will hurt it. I’ve given it quite a bit before Christmas, it’s still very wet. I’m going to dry it out at room temperature and put it back in an unheated place. I’ll monitor how it ‘feels’ by looking at its bark and buds. And once it ‘feels’ thirsty, it will be less erect. You’ve just got to look like in zen mode, hard to explain and grows with experience.
But once it’s less happy, i’ll water it from the bottom, and that’s important. People just splatter water on the top soil making a marsh, just to be sure, but that’s wrong. Put it on a plate or something. Water the plate scarcely. If it soaks up to the top soil, let the top soil dry out again, before watering again. Wet top soil leads to mold. If the moisture is down there mostly, the tree will be happier.
Then there’s leafy trees, somebody gave me an Albizia, it’s keeping it’s foliage, it’s slowly still photosynthesising so need a bit more water than the Anna Paulownia.
And then, the smaller your tree is, the closer it’s leafs and main stem will be to the evil surface of the topsoil, the dryer it should be. But then the problem becomes, a small tree has tiny roots, so then it’ll be in a smaller container mostly and will completely dry out quicker, which also could be not good, especially if it’s still busy photosynthesizing. So then frequent monitoring becomes a thing, but if you put it somewhere way in the back, you might forget. It’s puzzling and moving pots at times.
But ideally we don’t do all this moddycoddling, just let them fend for themselves, obtain a zillion seeds and STUN the heck out of them. But when you only have a few seeds or limited money supply and when you’re growing trees outside their natural range of preferred climate, we need to be a bit more active to get them past their starts.