When Hannan Braun felt stressed at work, he would treat himself to a houseplant. “At one point, I think I had well over a hundred plants,” said Braun, who lived in a studio apartment and was working on the front lines of the pandemic in Boston, “but it never looked cluttered or felt like I had too many.” For Braun, indoor plants have been a lifeline for dealing with the stress of medical training during the pandemic. Surrounding himself with lush greenery always calmed him down, he said, and helped him feel rejuvenated.