black walnut, where are you? I don't know the answer to the coffee tree query. The question isn't so much "any problems with X tree," but "how will this tree do in this climate, part of the garden, with this level of water, cold, etc." It might be GREAT in Kentucky but a weed tree in Mississippi and a stragler in New York. (This is a wild example, I don't know anything about that tree).

Don't go to the commercial nursery to ask that question--they have trees they want to push, regardless of their quality. Ask the local forester in your city park department or find a local organic gardening group.

You could also go to your state's agriculture university and poke through their plant recommendations. They're bound to have some descriptions of the habits of trees in your area.

We have a local commercial nursery that prides itself on well-adapted ornamentals and as many natives as they can manage to propagate. It's called Weston Gardens In Bloom, but their information is pretty specific to this North Central Texas growing region.

Who knows, maybe hackberry isn't so bad where you live. But since it's a prolific native here, it isn't something anyone has to plant volunatily.

SRS