PGRs on Perennials: Verbena Canadensis

Homeowners love the spreading, trailing habit of Verbena canadensis. Cultivars like ‘Homestead Purple’ made a long-lasting splash in the garden center marketplace as a great groundcover with their spreading habit and heavy flower power spring through frost in the fall. However, growth management in the...
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Growth Control of Perennial Ferns

By Joyce Latimer, Virginia Tech Production of hardy ferns is becoming increasingly profitable as demand for these herbaceous perennials increases. However, growth management, especially of the larger species, in one-gallon pots can be very difficult. At the request of a grower, we tested the use...
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Fresco Growth Promotion

Brian Whipker, North Carolina State University Many factors can result in plant stall, including insufficient fertilization rates, sub-optimal temperatures, cloudy weather, and plant growth regulator overdoses (anti-gibberellin PGRs) (Figure 1). The question often asked by growers, “how can I obtain a little additional growth?”  The...
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Evening-Out Results with Paclobutrazol

Brian Whipker, North Carolina State University One of the most popular plant growth regulators (PGR) used in greenhouse floriculture production is paclobutrazol.  Bonzi® from Syngenta was the initial paclo registered in the U.S.  Fine Americas offers Piccolo® and their newer formulation of Piccolo 10XC®.  For...
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