Tovah Martin, gardener and author, has devoted a good part of her life to houseplants. Most of us have a limited view of what houseplants we might put on our windowsills, but when she found herself working at the wonderful Logee’s Greenhouse in Connecticut she fell in love with the hundreds of houseplant varieties put into her care. Over the years Martin has written books like Well-Clad Windowsills: Houseplants for Four Exposures, The Unexpected Houseplant: 220 Extraordinary Choices…