Trees aren’t planted in areas typically used for agricultural (food crop) use. That land is better put to use growing traditional food crops. Managed forests aren’t irrigated or fertilized like corn or wheat. The areas are too large, too remote, and not flat enough to make that remotely feasible. Once the trees are large enough, forests are pretty much plant and forget operations (with some regular maintenance for clearing brush or pruning). No one will be trying to get the optimal amount of CO2 collection from each tree. That just isn’t practical. Instead, you do what you can to make the whole work as best as you can, but cover a large area. Engineering a better growing tree for carbon capture makes a lot of sense.