February 9, 2017
Bulking and Height Control of Purple Fountain Grass With Plant Growth Regulators
In the second article of a two-part series, researchers discuss methods for using plant growth regulators to bulk purple fountain grass and regulate its height.
January 5, 2017
Successful Propagation of Purple Fountain Grass From Single-Internode Culm Cuttings
In the first article of a two-part series, researchers discuss how propagation daily light integral and root-zone temperature influence root growth and development of single-internode purple fountain grass culm cuttings.
November 4, 2016
Evaluating Greenhouse Supplemental Lighting For Young And Finished Plant Production
Researchers at Purdue and Michigan State University compare young and finished plant production under LED toplighting and HPS lamps to determine which source is most effective.
October 3, 2016
Perennial Propagators’ Successes And Challenges: Results Of A National Survey
A survey by researchers from Purdue University and Michigan State University report the hurdles growers face when propagating perennials, and the practices they use to root them successfully.
November 18, 2015
Using Bench Top Heating With Reduced Air Temperature During Poinsettia Cold Finish
Researchers determine if bench-top root-zone heating in combination with reduced air temperatures is an effective method for poinsettia cold finishing.
September 23, 2015
MSU Offers New Greenhouse Lighting Online Course For Growers
Michigan State University Extension is now offering a non-credit, pre-recorded online course on greenhouse and horticultural lighting. The lighting course is intended for greenhouse and ornamental plant growers and others interested learning about the fundamental concepts about how plants respond to light quality, quantity and in duration. It provides introductory to moderately-challenging content primarily based on experiments performed at Michigan State and Purdue Universities. This is the second course in the College of Knowledge Online series offered on the national Extension website. The first course was Floriculture Root Zone Management, also available online. What Growers Will Learn From Taking This Course The 3-hours of pre-recorded lecture and video demonstrations are divided into seven units. The first and second units cover the properties of light and its importance for plant growth and development. The third unit discusses how light quality influences stem extension and flowering. The fourth unit of the course teaches […]
September 22, 2015
Sole-Source Lighting In Horticulture: Bedding Plant Plug Production
Researchers determine how sole-source LED lighting can be used effectively for the production of bedding plant seedlings.
August 21, 2015
Sole-Source LED Lighting In Horticulture: Microgreens Production
In Part 3 of a four-part lighting series highlighting the multiple uses of light-emitting diodes (LEDs), researchers examine the effects of sole-source LED lighting on microgreen production to achieve the highest quality crop possible in an energy efficient manner.
August 14, 2015
Customizing Crop Foliage Color With LEDs: Ornamental Crops
Do you find that your purple fountain grass (Pennisetum setaceum ‘Rubrum’) crop is often green to light purple? What if we told you there is a quick solution to enhance and darken the foliage of purple fountain grass or other floriculture crops? In this second article of a four-part series highlighting the multiple uses of high-intensity light-emitting diodes (LEDs), we will discuss our research methodology and findings for enhancing the foliage color of ornamental crops with end-of-production (EOP) supplemental lighting (SL) in the greenhouse. Many ornamental crops that greenhouse and nursery growers produce vary in size, shape and color. These variables are often influenced by the growing environment. For example, leaf color (intensity, distribution or both) of ornamental crops such as purple fountain grass is a key component that often influences the consumer’s perception and ultimately an impulse purchase. The red or purple pigmentation of purple fountain grass leaves is […]
June 29, 2015
Customizing Crop Foliage Color With LEDs: Red Leaf Lettuce
In the first of a four-part series highlighting the multiple uses of light-emitting diodes (LEDs), researchers share how end-of-production supplemental lighting with LEDs enhances red leaf lettuce color prior to harvesting and shipping.
July 29, 2014
Bench-Top Root Zone Heating: Can You Reduce Air Temperatures And Finish Bedding Plants On Time?
This is the second article in a two-part series featuring research from Purdue University that focuses on energy-efficient production strategies for annual bedding plants.
June 6, 2014
High Tunnels: Reduce Heating Costs While Improving Bedding Plant Quality [Slideshow]
This is the first article in a two-part series featuring research from Purdue University that focuses on energy-efficient production of cold-tolerant bedding plants.
January 29, 2014
Basics & Beyond: Cold Finishing Poinsettias
Reducing temperatures during finishing (RTF) can reduce energy and input costs when producing poinsettias. Check out research from Purdue University and University of New Hampshire on how RTF influenced plant height, bract area index and time to marketability and first pollen shed.
November 14, 2013
The Basics & Beyond: Understanding The Differences Between Photoperiodic And Supplemental Lighting
As I talk to growers around the country, I often find that there is confusion between (1) photoperiodic lighting used to create a long day for flower induction of long-day plants and (2) supplemental lighting used to increase the total quantity of photosynthetic light received over the course of the day, which is referred to as daily light integral (DLI) in the greenhouse. For more information on DLI, please visit http://bit.ly/11x79eK To add to the confusion, supplemental lighting is sometimes referred to as photosynthetic or assimilation lighting. In this article, I will attempt to clarify the differences to assist you in selecting the appropriate lighting strategy for your greenhouse crops. Understanding Photoperiodic Lighting The number of hours of light in a 24-hour period (photoperiod) controls flowering of both short-day and long-day crops. It is actually the uninterrupted period of darkness that controls flowering responses. Long-day plants are those that only flower […]
November 14, 2013
Comparing LED Lighting To HPS Lamps For Plug Production
Research at Purdue University is determining how LEDs, providing light of different wavelengths, compare to traditional high-pressure sodium lamps.
September 13, 2013
Comparing LED Lighting To High-Pressure Sodium Lamps
Cuttings of vegetatively propagated bedding plants are frequently rooted in late winter and early spring to meet the spring and early summer market demand for flowering bedding plants. However, this is also the time when dirty and old glazing material, interior superstructures, and hanging baskets suspended above benches reduce already seasonally low ambient outdoor daily light integrals (DLIs) inside the greenhouse. Increasing the DLI during propagation has been shown to improve growth and quality of rooted cuttings, as well as reduce time to flower after transplanting. While maintaining clean glazing material, minimizing superstructure and reducing the density of hanging baskets may increase greenhouse DLI, the only way to appreciably increase DLI is to provide supplemental or photosynthetic lighting. Light-emitting diodes (LEDs) are solid-state, semi-conducting diodes that can emit light from ~250 nm to ≥1000 nm. There are several features of LEDs that make them attractive alternatives to high-pressure sodium (HPS) […]
April 19, 2013
DLICALC Online Tool Helps Growers Caculate Daily Light Integral
Managing all the different environmental and cultural aspects of greenhouse crop production can be an intimidating and daunting task, especially during the peak production season. But it’s necessary to produce a high-quality, salable plant. The greenhouse is full of moving targets, from root zone pH and EC to plant growth, air temperature and light. Managing each of the parameters of greenhouse crop production to consistently produce quality crops on time can be a challenge. Thankfully, the development of decision-support tools can aid greenhouse growers. GROCALC is a suite of electronic grower decision support tools that include ALKCALC, FERTCALC and PGRCALC. These programs are useful for making calculations related to greenhouse crop culture including water acidification requirements, fertilizer solution and plant growth regulator (PGR) mixing. However, there are few or no tools available to help make calculations related to the greenhouse light environment. Although light is frequently discussed in terms of […]
April 3, 2013
Using Parboiled Rice Hulls In Substrates to Finish Greenhouse Crops
Have you considered replacing perlite with whole parboiled rice hulls (PBH) or peat with ground PBH in your growing substrate for finishing spring bedding plants, but are not convinced they are an effective substrate component? Alternative substrates are a hot topic, as many growers are looking for more sustainable growing mixes, lower production costs and superior performance. However, alternative substrate components do not have the history and popularity that peat moss or perlite may enjoy. In the April issue of Greenhouse Grower, we shared the results of our work propagating New Guinea impatiens cuttings in substrates containing whole or ground PBH as replacements for perlite or peat moss, respectively. In this second article of the two-part series, we will share our most recent research examining how whole and ground PBH work for finishing seed-propagated bedding plants in the northern U.S. How The Study Was Conducted At Purdue University (40 […]
May 29, 2017
New LED Options Designed to Boost Greenhouse Plant Qual…
LumiGrow and Philips recently introduced high-efficiency lighting options that are designed to reduce energy costs and improve crop consistency.
May 28, 2017
Growers Offer Advice on What to Know Before Your Next B…
Two Top 100 Growers discuss their most recent building projects, the challenges they addressed, and what they learned during the process.
May 27, 2017
How to Overcome Biocontrol Challenges by Thinking Outsi…
With a little creative thinking and adjustments to your strategy, you can overcome your greenhouse biocontrol challenges.
May 26, 2017
University of Florida Course Helps You Improve Greenhou…
The University of Florida (UF) Institute of Food and Agricultural Sciences is offering an Advanced Nutrient Management course through its online greenhouse training program.
May 26, 2017
New Software System From Boxcar Central Takes Growing D…
Boxcar Central’s data-hub platform allows growers to log mass amounts of data and use it to compile information on crop quality.
May 25, 2017
Allan Armitage: Two Great Examples of Young People Movi…
In his latest column, Allan Armitage says perhaps we should, as an industry, extend our hands to our youngest members. We might be pleasantly surprised what happens.
May 25, 2017
Jury Awards Damages in Stepables Photo Copyright Case, …
According to a press release from Under A Foot Plant, Co,, a jury awarded Under A Foot Plant (which owns the Stepables product line) $900,000 in actual damages for The Perennial Farm’s use of Stepables’ copyrighted photographs.
May 25, 2017
AmericanHort Hosting Advocacy Visit to Capitol Hill in …
AmericanHort has announced it will be hosting Impact Washington, an inaugural advocacy and policy summit, in Washington, DC, Sept. 12-13.
May 25, 2017
Genetically Modified Petunia Update: Breeders Take Swif…
Now that the initial shock of genetically engineered petunias is wearing off, breeders continue testing for tainted stock and look toward the future. On the consumer side, uncertainties remain.
May 24, 2017
Sustainability in the Greenhouse is More Than Just Abou…
Bell Nursery has taken several steps over the years to make our operation more sustainable from a technological standpoint. Here’s how we are doing it.
May 24, 2017
What to Expect at the Perennial Plant Symposium in Denv…
The Perennial Plant Association’s annual Symposium takes place July 23-28 in Denver, CO, and features 28 educational sessions, six local tours, and a trade show.
May 23, 2017
The Road to Sustainability at Cavicchio Greenhouses
Incremental changes to reduce its carbon footprint have paid off in greater efficiency and public recognition for this Massachusetts greenhouse grower.
May 23, 2017
USDA-APHIS Bulletin on Unauthorized Distribution of Gen…
On May 2, 2017, USDA-APHIS was informed that an orange petunia variety was potentially genetically engineered and had been imported and moved interstate without required authorization by APHIS. This led to testing of numerous petunia varieties, which confirmed this particular variety and several others are genetically engineered, and meet the regulatory definition of a regulated article under APHIS regulations. APHIS continues to work with the industry to ensure unauthorized GE petunias are not distributed in the United States.
May 22, 2017
New Dümmen Orange Scholarship Honors Legacy of Dr. P. A…
“Our industry’s future depends on attracting and supporting bright, hard-working students into horticulture programs across North America, and the support of Dümmen Orange will aid that effort,” Hammer says.
May 22, 2017
Genetically Modified Petunia Update: Question and Answe…
AmericanHort’s key role interfacing with the USDA on the recall of genetically modified petunias has helped the horticulture industry rapidly address the problem. Senior Vice President Craig Regelbrugge talks about recent updates, the impact on the industry, and where it goes from here.
May 21, 2017
Final California Spring Trials Thoughts From Allan Armi…
“I went home from California Spring Trials realizing that the students enrolled in our Greenhouse Management program at Spokane Community College need to experience the trials. Attending opened many doors of opportunity for me.”