Answer: Unfortunately, there is no way you could possibly hope to overwinter a citrus tree outside in Ohio and expect it to survive. You will have to keep it as a container plant and bring it indoors each fall and overwinter it inside.
I hope the label actually reads Citrus sinensis `Dwarf Campbell.` If so, your tree is a smaller growing variety suitable for container growing. It should ultimately reach a size of about 8 to 12 feet -- unless you keep it smaller by pruning.
If it is not a dwarf form, perhaps the nursery would exchange it for another variety better suited to container use. Good luck with your orange tree!
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