I read about Tinyfield Roofhop Farm in the latest Beer Advocate magazine (which also talked about the nascent efforts of Angel City to grow hops in the heat of DTLA)
This NYC rooftop farm grows “microgreens, salad greens, edible flowers, and hops in Bed-Stuy, Brooklyn.”
The farm began growing in 2015. More may come because the Farm Brewery Bill of the State of New York requires craft brewers to brew beer made primarily from NY grown farm products. By 2018, they need to use at least 60% state hops and other ingredients with the number growing to 90% by 2024. So supply will need to meet demand.
Now if California had a similar bill, maybe we can have places like Tinyfield which have 100 Cascade Hop plants up on the roof.