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May 12, 2015
Plant protection of greenhouse-grown horticultural crops requires a basic knowledge of the biology, behavior, and life cycle of the most common insect and mite pests such as aphids, whiteflies, thrips, and spider mites. It also requires a...
April 13, 2015
Figure 1. Sprench applications of PGRs have become more popular on aggressive bedding plant crops such as petunia. I’ve noticed an increasing trend in the use of sprench applications of plant growth retardants (PGRs), especially by large-scale...
April 13, 2015
 Abalzin' salvia is currently offered in two colors: Tabasco and Purple. Salvia is one of the most traditional consumer gardening flowers, combining easy care and a long season of color with a host of other great traits. At one point salvia was...
April 13, 2015
‘Hipsters Zooey’ is heat tolerant and performs well across much of the country. Best leaf coloration occurs in locations with morning sun and afternoon shade. For more than twelve years I have featured a wide range of perennials in this column....
April 13, 2015
For years, the horticulture industry has been at the forefront of the sustainability discussion. Greenhouses and nurseries were using recycled materials and initiating waste-reduction plans long before other industries recognized the need for...
April 13, 2015
Vessel Bio Products is situated within the Ohio Agricultural Research and Development Center’s BioHio Research Park. The horticultural division of Vessel specializes in adapting the sustainable soil health methodologies the company developed in...
April 13, 2015
Western flower thrips are some of the most common and damaging insects found on plants grown in greenhouses. These insects have many characteristics that help them become pests; they have a short life cycle going from egg to adult in about two...
April 13, 2015
If you have only been growing one type of plant, for instance tropical foliage plants, you might think all plants get the same diseases. In my 35 years as a plant pathologist, I have worked on nearly all types of ornamentals from cut flowers to...
April 13, 2015
Of course you do! But do you know what 2015 is the Year of? Do coleus, gaillardia and sweet pepper sound familiar? They should, because those are the crops that the National Garden Bureau (NGB) has designated for its “Year of” program for 2015. Each...
November 07, 2014
Retail sales of cannabis began in Colorado on Jan. 1, 2014. Prior to the start of marijuana sales, Colorado voters last fall approved an excise tax of 15 percent that gives the first $40 million to school construction, and also a special sales tax...
February 12, 2014
What’s new? As the season changes and the nursery is full with pansies and perennials, landscapers and designers are coming to shop and at least once a day someone asks “What’s new?” There are usually new varieties of plants to offer, but there are...
January 14, 2014
In the December 2013 issue of GPN, I discussed cold-sensitive bedding plants, which are crops that have a relatively high base temperature (46° F or higher). At low growing temperatures, cold-sensitive crops develop very slowly and therefore, they...
January 14, 2014
Sitting in the store next to a few dozen other tropical plants is an aglaonema with a striking red and pink variegation throughout its leaves. The color and texture is foreign to many of the people who walk by, which is not surprising. That’s...
December 16, 2013
For the last several years, one of the floriculture research thrusts at Michigan State University has been to better understand how temperature controls growth and flowering of bedding plants. Former graduate students Matthew Blanchard, Lee Ann...
December 16, 2013
Growing and selling plants in today’s market can be challenging for many reasons outside of our control, such as the weather and the economy. One factor, however, is under our control and should not be a problem — poor quality water. Water high in...
December 16, 2013
Knowing that he didn’t have the money necessary to start his own farm, Randy Butts looked at greenhouse hydroponics as a way of starting his own agricultural business. Butts worked as an engineer for 10 years in the automation and controls industry...
November 05, 2013
Most petunias are facultative long-day plants, since they flower earlier when grown under long days compared to short days. Early-season petunias are grown when the natural days are still short, so growers often provide low-intensity long-day...
November 05, 2013
When I was in college, I had a job cleaning rooms in a heart valve production company. In this company, there were various levels of sanitation and cleaning that were required, and the levels of sanitation were monitored on a daily basis using...
October 09, 2013
An increasing number of growers are using high-intensity lighting during low-light periods to increase crop growth, especially during young plant production.  The benefits of increasing the daily light integral (DLI) are well documented and...
September 11, 2013
There are three ways to describe light intensity, but only one of them is appropriate for photosynthesis. Increasing use of light-emitting diodes (LEDs) means that the appropriate unit for light measurement is more important than ever. Although...
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