View All: Articles

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...
February 13, 2015
A-Rest and Abide are two plant growth retardants (PGRs) that contain the active ingredient ancymidol. They aren’t as commonly used in floriculture as most other PGRs, which could be attributed to ancymidol’s cost. However, there are some potential...
November 07, 2014
There are numerous definitions of the word ‘striking.’ One definition is: conspicuously  attractive or impressive. ‘Striking’ is precisely the word that comes to mind when I see Lobelia cardinalis ‘Black Truffle’. The combination of its dark...
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...
October 08, 2014
The production of containerized floriculture crops often involves techniques to limit extension growth to produce compact plants. In some situations though, a grower may wish to increase plant height, such as when plants are too small for their...
July 09, 2014
Application of plant growth retardants (PGRs) is the most common technique used by greenhouse growers to control crop height. When used at an appropriate rate and volume, PGRs can elicit desirable results, such as improving crop quality. However,...
October 09, 2013
Amaryllis (hippeastrum) is a popular bulb crop grown by greenhouse producers as pre-finished potted plants and marketed for major holidays, including Thanksgiving, Christmas and Mother’s Day. Amaryllis are also often sold to consumers as dry bulbs...
August 06, 2013
Daminozide was one of the first plant growth retardants (PGRs) registered for use on agricultural crops. It was first registered in 1963 for use on potted chrysanthemums and was later approved for use on food crops. Although it is still commonly...
June 11, 2013
For many years, growers have been using the plant growth regulator (PGR) Florel on ornamental crops to abort flowers and flower buds, inhibit extension growth and promote lateral branching. Florel contains the active ingredient ethephon, which...
May 09, 2013
I am commonly asked what rate, chemical and/or application method of plant growth retardants (PGRs) to apply to various floriculture crops. Responding to such questions is difficult since the answers are so situational. There are different ways to...
April 16, 2013
A critical factor for effective use of plant growth regulators (PGRs) is that the solution is mixed in the appropriate proportion. Dilution mistakes, which are not uncommon, result in a lack of a plant response (from too little PGR) or an excessive...
April 16, 2013
The plant growth regulator (PGR) Florel has been used for many years as a foliar spray on a wide variety of ornamental crops as well as some food crops. Until recently, Florel was only thought to be effective when applied as a foliar spray. At the...
March 19, 2013
In floriculture, we have long been familiar with Florel sprays, whether for height control on hyacinths or daffodils, to abort flowers and promote of branching in many crops (such as geraniums and fall mums), or to induce flowering in bromeliads....
March 19, 2013
Each year the North American Poinsettia Trials evaluates hundreds of poinsettia cultivars, many of which are new to the market. However, as any poinsettia grower will tell you, selecting the right cultivar is only the beginning. Many decisions have...
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
Calla lilies (Zantedeschia) have become a popular greenhouse floricultural crop in the United States, and interest continues to increase for both pot and cut flower production.Callas have long-lasting, elegant flowers and have been a favorite in...
November 12, 2012
The plant growth retardant Sumagic (Valent USA) contains the active ingredient uniconazole and is the only plant growth retardant registered for use as a foliar spray on young tomato, pepper, eggplant, groundcherry, pepino and tomatillo plants. The...
August 09, 2012
It’s a well-known fact that herbaceous perennials are growing in popularity with today’s consumers. The reasons are many, from the inherent convenience and value of perennials to the ever-expanding variety of perennials available to homeowners and...
July 09, 2012
Whether poinsettias are pinched by hand or are mechanically sheared, considerable effort and expense goes into the pinching process. Today’s poinsettia varieties all branch better than older varieties, but none would be described as “free branching...
June 08, 2012
In addition to the greenhouse environment, crop culture including fertilizers, substrates, and plant growth regulators (PGRs), has a large impact on our ability to grow high-quality greenhouse crops. If properly managed, these three inputs can...
Email Subscriptions