CONTENTS THE BUSINESS MAGAZINE FOR COMMERCIAL GROWERS APRIL 2021 | VOLUME 31, NUMBER 4 36 On the Cover Delgenius is a new delphinium that showcased colorful double blooms on strong stems in 2020 summer trials. Turn to page 36 to learn more about Delgenius and other top perennial trial performers. (Photo: Pacific Plug & Liner) 34 40 DEPARTMENTS FEATURES 22 Plant Health Perennial Problems with Mildew, Rust and White Smut Which pathogens should you expect, and how can you counteract them? By Margery Daughtrey 28 Plant Health Improve Rooting, Plant Establishment and Growth of Cuttings Two new products treat cuttings of hard-to-root and slow-growing plants. By Jim Scruggs 34 Culture Report Leucanthemum 'Sweet Daisy Birdy' A new standard in a summer staple, this innovative perennial variety is an unstoppable performer in any location. By Jeff LaCourse COLUMNS 10 Perspectives Sensory Engaging Plants for Therapeutic Gardens By Susan Morgan 14 Dr. Bugs Tips on Managing Mealybugs By Raymond A· Cloyd 18 Duets Scientific Discovery's Moment of Excitement By Peter Konjoian and John Erwin 36 Vaughn's View Captivating Perennials: Part 2 By Vaughn Fletcher MARCH 2021 42 Technically Speaking " Hidden " Benefits of Supplemental Lighting By Erik Runkle INSIDE: Year of the Hibiscus Light & Plant Health Maximizing Photosynthesis GREAT AMERICAN MEDIA SERVICES GPNMAG.COM Miss our March issue? It's now available to view on gpnmag.com 4 Editor's Report 6 Industry News 8 Chat Room 33 New Products 40 Variety Spotlight 41 Classifieds/Ad Index gpn GREENHOUSE PRODUCT NEWS MAKE AN IMPACT WITH Powerful Perennials p. 36 GREENHOUSE PRODUCT NEWS 3http://www.GPNMAG.COM http://www.gpnmag.com