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 […]
November 24, 2017
How RFID Technology Can Help With Plant Cart Tracking
One of the biggest hassles in the greenhouse is keeping track of all those shipping carts. Improved RFID technology for cart tracking may be one solution to help keep profit losses due to lost or damaged carts at a minimum.
November 23, 2017
Climate Screens Offer Both Form and Functional Benefits
Svensson’s new line of Deco Harmony screens is designed to create better growing conditions for plants on display at retail, while enhancing the customer experience.
November 22, 2017
Growers Showing Renewed Interest in Specialty Cut Flowe…
At the brink of its 30th anniversary, the Association of Specialty Cut Flower Growers is connecting a diverse and growing group of members dedicated to producing and marketing cut flowers.
November 22, 2017
Griffin Sets Dates for 2018 Grower & Retailer Expos
The company will host two Expos next year — one each in Massachusetts and Pennsylvania — and each will be a two-day event.
November 22, 2017
2017 Louisiana State University Field Trials Results
Check out the 2017 field trials results Louisiana State University in Hammond, LA.
November 20, 2017
Botany Lane Greenhouses Announces Expansion Into Young …
Botany Lane, a producer of finished tropical plants, succulents, and specialty annuals in the Western U.S., recently announced it is expanding to provide young plants for growers and grower-retailers.
November 20, 2017
2017 Colorado State University Field Trial Results
Check out the 2017 field trial results for Colorado State University in Fort Collins, CO.
November 18, 2017
Mayer Celebrating 50th Anniversary of its Potting Machi…
Today, the company’s line of automatic potting machines and other technology is being used by growers around the world.
November 17, 2017
How You Can Help Berger in Donating to Hurricane Harvey…
Between Nov. 23-27, Berger will donate $1 for every download of its free technical plant production guides to hurricane relief efforts.
November 17, 2017
Presenting All-America Selections’ Latest Round of Awar…
All-America Selections has announced the latest round of its award-winning varieties, each of which was trialed throughout North America by professional, independent, volunteer judges.
November 16, 2017
Costa Farms’ New Marketing Director Eager to Tap Into C…
In her new position, Damarys Mora Crawford will lead Costa Farms’ marketing team and create and execute strategic marketing initiatives to support continued sales growth for the company’s retail customers.
November 15, 2017
Greenhouse Short Course in March 2018 Features Focus on…
The Greenhouse Crop Production & Engineering Design Short Course, which takes place at the University of Arizona’s Controlled Environment Agriculture Center (CEAC), includes three full days of educational sessions, one day of hands-on training workshops at CEAC, and a commercial Arizona greenhouse tour.
November 15, 2017
Tips on Adding Heat to Your Greenhouse for the Winter
Heating your greenhouse for the winter is important, and choosing efficient equipment and designs can help you quickly get returns on your heating investments.