Should I be concerned now that the bark is splitting? I can see daylight through. Should it be cut.
This depends on the type of tree. Some will do this naturally, while some will have issues like age, disease, watering issues, ice formation, or animal damage. Your local extension service can test for these parameters.
Behind my backyard property line is wetlands. Builder removed a large portion of trees leaving a big flat area that needs greenery. I'd like to plant shrubs but they need to survive in very moist soil.
We don't recommend plant vendors but here is information about plants that tolerate moist soil or flooding. You should be able to find them at a local nursery or through a native plant nursery.
https://www.gardeningknowhow.com/ornamental/shrubs/shgen/wetland-shrub-plants.htm
https://www.gardeningknowhow.com/special/spaces/designing-bog-gardens.htm
https://www.gardeningknowhow.com/special/spaces/rain-garden-design.htm
I’m planning to use smart pot reusable fabric planters for 30ea 2-3’ dry root trees please and ordered 1 gal pots. Should I start smaller and transplant after a year of growth or plant directly into the 1 gal pots? I’d so what size to start? Thanks in advance
It's important not to use containers that are much larger than the rootball because the extra moisture held in the potting soil can cause root rot. But for trees, the 1 gallon pots should be fine. You don't want the pots too small or they will tip over as the tree grows. Just make sure the soil is very well draining. You can add perlite to the mix if needed.
https://www.gardeningknowhow.com/ornamental/trees/tgen/growing-trees-in-containers.htm
We are building a house and I'd love to have some fruit and smaller ornamental flowering trees to line the fence. My question is could I buy some trees and pot them just now until my house is done and the garden is finished before then planting them in the ground?
As long as they are not rootbound, and you have a large enough container, then it can be fine. This can be up to a 20-30 gallon container, and you can stage up each year or care for it carefully in its final container size.
This article will offer more information on the care of trees in container:
https://www.gardeningknowhow.com/ornamental/trees/tgen/growing-trees-in-containers.htm