When it comes to garden plants, cacti are anything but standard issue. The bulk of home gardens contain exactly zero species of cactus, and the thought of growing them makes gardeners think, “Ouch!” In The Gardener’s Guide to Cactus: The 100 Best Paddles, Barrels, Columns, and Globes, Scott Calhoun is out to change that perception, and bring the beauty and ease of cactus home. It’s high time that cacti took their place alongside the trendy succulent.