A few months ago I made the rookie mistake of bringing a few plants from an unfamiliar nursery into my collection without quarantining them. It wasn't long before many of my treasured plants were swarming with gnats after a watering. I read so many articles and was dismayed at what I was learning. What little hope I had of solving the problem was an expensive, smelly, and unattractive multi-prong assault of traps, sticky papers, oils, nematodes, and soil-smothering additives. Then I came across ...