Lots of money to build greenhouses
There are auto-flowering varieties that are independent of photoperiod to bloom. Might be able to grow three crops a year, outdoors.
All indoor
The months are short, Memorial Day to October.
The days are long, due to being closer to the Arctic Circle, over an hour longer than in NYC in the summer.
The weed is probably grown indoors in the house.
Especially in the basement with grow lights
This happened here in NH during the Great Recession.
Except it was Mexican Cartels who bought houses in bankruptcy
Then they tapped into the electrical lines and bypassed the meter.
They even used existing chimneys to vent the heat put out by the large number of 1000 watt bulbs.
They caught them because the electric utility noticed the usage of power on parts of their grid and were able to track down the houses.
Then they scanned them with infrared to show the heat coming out of the house.
There were about a dozen in southern NH.
Some were in nice neighborhoods too.
Each house had one or two caretakers tending the crop.
short growing days for most of the year. Must be greenhouses. high overhead so why Maine? cheap land?