I'm not an expert but I do note, with accuracy, that the term Plantation didn't always mean that the northern colonies Plantations were managed using slave labor. For example in the Province of Maine, before it became a State in 1820, tens of thousands of acres were sold to investors as "Plantations" in preparation for natural resource exploitation. The Plantation designation remained even after state-hood was granted and I believe it remains today. I've seen the same arrangements in New Brunswick and Nova Scotia after the British assumed control but those northern provinces weren't anti-slavery like Maine so they might serve as relevent examples; but, detailed investigation is probably warrented.