Exiting his pickup truck, Steve Groff stepped out onto an earthen lane earlier this month, gesturing toward a row of tents on his Holtwood farm and the dozens of dark green plants hung to dry inside. Walking beneath one of the canopies, Groff reached out and grabbed a plant, pulling it to his nose before breathing in. âYou have to smell this,â he said, proud of the crop that looked and smelled a lot like marijuana. It wasnât, Groff made clear. The plant was actually legally grown hemp, another form of cannabis that can be cultivated in Pennsylvania as long as farmers maintain a...