Some people collect art, others collect vintage cars, or maybe stamps or coins. Darryl Cheng collects houseplants, and in his latest book, “The New Plant Collector,” Darryl suggests some gorgeous possibilities, with detailed guidelines for figuring out how to make a good match for your growing conditions before you invest. Ready to add some houseplants?  Darryl Cheng, better known as @houseplantjournal on Instagram, uses all the technical insights available to him to make the countless houseplants that share his Toronto home thrive. He’s the author of a previous book “The New Plant Parent,” and creates the popular website, houseplantjournal.com.