PGRs on Perennials: Agastache spp.

By Joyce Latimer, Virginia Tech Another group of herbaceous perennials that attract the hummingbirds is Agastache spp. Popular Agastache flowers come in a variety of species and cultivars that are commonly called the giant hyssops or hummingbird mints. And regardless of the color, these tubular...
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PGRs on Perennials: Monarda didyma

By Joyce Latimer, Virginia Tech Ahhh, it’s hummingbird time! Everyone loves those tall, bright beebalm flowers attracting those adorable birds to the home garden. However, homeowners have no clue how tough it is for growers to get those vigorous “weeds” to the garden center looking...
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PGRs on Perennials: Buddleia spp.

Butterfly bushes (Buddleia spp.) are great perennial flowering plants to meet the current interest in pollinator gardens. These very vigorous plants are typically grown as herbaceous perennials although they become quite woody in the landscape. We’ve conducted several PGR trials with different cultivars using uniconazole...
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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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