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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...
September 11, 2013
As competition increases and quality and productivity pressure rises, North American growers are increasingly taking a page from their European counterparts and making lighting a crucial part of their greenhouse production programs. While extending...
September 11, 2013
As more and more greens and herb production occurs in recirculating culture, grower interest in providing crop nutrients from organic sources has increased. Following is our experience at Kansas State University with two different nutrient...
August 06, 2013
The first step to nutrient dosing is knowing your water. Liquid feeding programs always begin with the water. If it isn’t suitable for horticulture, you can’t produce a quality crop. While there are a number of things that can be done to improve the...
July 10, 2013
Potted garden (hardy) chrysanthemum is one of the most valuable segments of floriculture crop production in the United States. Produced and sold mostly from summer through autumn, they can be challenging to grow because of their responses to...
July 10, 2013
By definition, the word “phenomenal” refers to something that is very remarkable or extraordinary. In the past, there have been instances where the cultivar names of certain plants fell short or have not always been representative of the plant’s...
June 11, 2013
Equipment maintenance has become a fundamental requirement for efficient cost-effective production in today’s greenhouse. Bale processors, soil mixing, soil carrying conveyors, flat and pot fillers, water stations, transport conveyor and the list...
June 11, 2013
Marc van Iersel, professor of plant nutrition and physiology at University of Georgia in Athens, is a big believer in sensor-controlled irrigation. “Most growers underestimate the importance of sensor-controlled irrigation and how much money it...
May 09, 2013
A very wise grower once told the young assistant “avoid compacting the mix at all cost,” and then proceeded to tell her the various ways that compaction can occur. In fact, improper or careless mix handling can result in many problems. In a mix, the...
March 19, 2013
Petunia is among the most commonly grown bedding plants. It has been bred extensively for desirable flower traits, growth habits, extended blooming periods, stress tolerance and quick production. Wave petunia from PanAmerican Seed is the most...
March 19, 2013
Like many ornamental plants, perennials are susceptible to numerous types of plant viruses. Growers often jump to conclusions when they hear the word “virus” and don’t consider that plant viruses are often not as destructive or common as diseases...
February 05, 2013
A plug or liner dip is a plant growth retardant (PGR) application technique in which a tray of finished young plants is placed into a shallow PGR solution for a short period of time.  This allows the growing media to absorb the PGR from the...
February 05, 2013
In September 2009, I visited the Florexpo facility in Paraíso, Costa Rica, and learned all about the 130 million cuttings they produce each year, sanitation protocols, their sustainable practices and so much more. In the December 2009 issue of GPN,...
February 05, 2013
The North American Poinsettia Trials reached a significant milestone this year — it has been evaluating poinsettias, in cooperation with the poinsettia breeder companies, for 20 years since it was started in 1993. The first trials include Allan...
January 10, 2013
January through March can be considered young plant season — a period in which seeds of many garden plants are sown and grown in plugs. Ornamental cuttings are also harvested, stuck and rooted as liners. During this time, the days are short and...
January 10, 2013
When it comes to lighting, the future is upon us. High-powered LED products, once the exclusive province of cutting-edge research, are invigorating today’s commercial greenhouse market. Your new choices, ranging from shelf lights and growth bulbs to...
January 10, 2013
Imagine cloning your most experienced, efficient  employees to get hundreds, or even thousands, of additional workers in your greenhouses who toil to improve the quality of your poinsettia (and other) crops and who never show up on your payroll...
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