January 9, 2013
Cool-Season Insect Control
AS growers ramp up production in late winter and into the early spring, they are often caught off-guard when they discover insects or mites feeding on the crops very early in the growing cycle. It can be very frustrating for growers to have to deal with insect pests this early in the season. Although the amount of insect activity and crop injury is usually minimal this time of the year (particularly when the production temperatures are low), if undetected, the populations of these pests can gradually increase and lead to significant crop injury later in the production cycle as temperatures rise. The presence of insects and mites in the early spring occurs frequently with perennials and woody ornamentals that have been overwintered, but they commonly occur in other crops under cool growing conditions, as well. In some instances, there are dormant life stages and eggs that overwinter on plant debris, […]
April 26, 2012
Ornamental Grasses: Not All Grasses Are Created Equal
With the popularity of ornamental grasses, many growers are offering them in their perennial product lines. Some growers handle and produce ornamental grasses as if they were all the same, but the truth is, growing several varieties in a similar manner will often lead to production and quality issues. Grasses can generally be categorized into three groups: cool-season grasses, warm-season grasses and sedges. These categories correlate with the seasonality or the time of year when they are actively growing. These groupings are also influenced by the origin of the individual grasses. When growers receive starting materials, how they grow the crops and their success is greatly influenced by the type of grasses they are producing. About Cool-Season Grasses Cool-season grasses are at their prime and flourish when they are grown with cool temperatures (60 to 75°F). These grasses typically begin to grow during the late winter or early spring and […]
March 23, 2012
Tips For Beautiful Bare Root Hibiscus
Hardy hibiscus continues to be a popular perennial grown for summer sales. One grower who began offering bare root hibiscus materials a few years ago is Walters Gardens. And although bare root hibiscus offers numerous benefits, many growers are still not familiar with this type of starting material. Bare root hibiscus are field grown and offer growers a much larger, more vigorous starter plant compared to the smaller liners typically used in the past. Bigger starter plants mean faster turnaround times, fuller containers with more flowers per pot and a high perceived quality. Flowering Characteristics Besides the benefits of using bare root plants, growers should consider thetype of flowering each cultivar offers. Not all hibiscuses are created equal. There are two types of flowering habits: determinate and indeterminate. Cultivars with determinate flowering develop flower buds near the terminal shoot. Indeterminate varieties develop flower buds at the nodes along much of […]
June 20, 2008
Misconceptions With Controlled Release Fertilizers
Pilon: How do rates vary between incorporation and topdressing? Passchier: There are two factors involved when speaking about incorporation and topdressing the fertilizer. The first is the potential differences in nutrient availability for the plant when incorporating versus topdressing. The second is the amount of fertilizer that is used when incorporated compared to the topdressing rate. Let’s remember that CRF fertilizers are released by temperature and research shows that different technologies are affected by the temperature changes around the CRF prill that can alter their expected release. Just think about the temperature fluctuations and moisture consistency in the media versus the temperature fluctuation and moisture consistency on top of the media. In general, there is likely to be less temperature fluctuation and more moisture consistency in the pot than on the surface of the pot. The surface of the media is subject to greater temperature changes between night to day […]
June 19, 2008
Q&A On Controlled-Release
Pilon: What are the methods controlled-release fertilizers (CRF) are applied? Passchier: The two most common methods of applying controlled-release fertilizers in greenhouses and nurseries is to incorporate them into growing mixes prior to planting (incorporation) or placing the fertilizer on top of the potting substrate (topdressing). Topdressing entails placing a predetermined amount of fertilizer on top of the growing medium of each container. Generally, topdressing is reserved for second-season crops, but there are some growers who topdress crops just after planting new liners. Care should be taken with this practice to make sure you have a first-season fertilizer and not a second-season topdress fertilizer. The first method I was exposed to 15 years ago was the "big hand" method. The grower/owner would show the hired help how much fertilizer to put in their hands and then place it on the surface of the container. Needless to say, the size of […]
June 18, 2008
Misconceptions About Controlled—Release Fertilizers
Delivering and managing nutrition is one of the primary tasks associated with producing greenhouse crops. Most growers deliver nutrients using various water-soluble fertilizers, some growers use controlled-release fertilizers (CRF), while others use a combination of controlled-release and water-soluble fertilizers. As I travel across the country to visit various growers, I’ve come to recognize that many growers would like to consider using controlled-release fertilizers at their facilities but do not understand these products well enough to implement them into their production systems. With a shift in irrigation and fertility practices, where growers must control leaching and water runoff from their production sites, the use of controlled release fertilizers will allow growers to produce high-quality crops and manage the nutrients that leave their production sites more effectively. From my perspective, there is a great need to educate growers of the benefits and risks associated with the use of controlled release technology. To help […]
June 18, 2008
What’s In Controlled-Release?
In the first installment of this four-part series, we began to introduce several important aspects regarding controlled release fertilizers (CRFs). Slow-release fertilizers are reacted urea formaldehyde products. Each has its own characteristic chain of polymers, which are gradually broken off by microbial activity and then made available for roots to uptake. Controlled-release fertilizers are fertilizers with nutrients that are encapsulated or coated, similar to an M&M candy, where there is an outer candy coating and the good stuff inside the coating. Fertilizer is released when moisture is drawn into the covered coated prill and turns the fertilizer salt into a semi-soluble form. The release of nutrients from the prill varies slightly with the technology used to formulate the coating. All CRFs typically have either a resin or polymer coating. The main difference is how the water soluble fertilizer comes out of the prill. The rate of release is often a function […]
June 18, 2008
Pilon: How does temperature affect release? Passchier: As we discussed previously (see the July 2007 issue), controlled release fertilizers can be compared to M&M candy since the good stuff is inside of the coating of each of these products. As the temperature increases so does the solubility of the candy and fertilizer on the inside. The main difference is the inside of the coated prill of the fertilizer contains some form of salt. Moisture needs to be present around the coated fertilizer prill in order for moisture to be drawn inside allowing the solid fertilizer salt to turn into a semi-soluble state. As the temperature increases, so does the solubility and the pressure inside the prill. Consequently, with higher temperatures and increased internal pressure, it requires less time for the fertilizer to come out of the prill and be available for plant uptake. The trick to formulating and using CRFs […]
June 27, 2017
New Pilot Project for Offshore Unrooted Plant Cutting C…
Four breeders — Ball Horticultural Co., Dümmen Orange, Proven Winners, and Syngenta Flowers — will participate in the initial pilot, which will include greenhouse growing operations in six Latin American countries.
June 25, 2017
Consumers Revel in Gardening at Metrolina Greenhouses’ …
Metrolina wanted to promote plants, gardening, and creating a sense of community, so it decided to host Dig & Swig events at a local brewery.
June 24, 2017
Green Fuse Botanicals New Vice President is Focused on …
Jim Devereux, who will oversee production, sales, and marketing for Green Fuse, says he hopes to bring genetics to the market that break from traditional production methods for finished growers.
June 23, 2017
Greenbelt Microgreens is a Finalist for the 2017 Operat…
Winner of the Excellence in Innovation Award, Greenbelt Microgreens is constantly staying on top of the latest trends in technology,
June 22, 2017
Japanese Breeder Ushio Sakazaki Wins Medal of Excellenc…
From Supertunias to Superbells, this innovative Japanese breeder has used wild genetics to create game-changing plants that help consumers reconnect with the beauty of nature.
June 21, 2017
New Tool from Koppert Provides More Effective Thrips Ma…
A newly patented sachet for the predatory mite Amblyseius swirskii is resistant to both low and high levels of humidity, helping growers combat thrips infestations.
June 20, 2017
Dümmen Orange Enters Calla Market With Acquisition of G…
Golden State will continue to supply the market through September 2018, at which time Dümmen Orange will assume supply and delivery of much of Golden State’s product line.
June 20, 2017
Sign Up For The Luxflora Flower Run At Cultivate’17
The5k walk/run race, sponsored by Luxflora, is an opportunity for industry members to network, build relationships, have some healthy fun, and start off Cultivate’17 with a flourish.
June 19, 2017
IGC Show Features Talks on How to Cash in on the Buy Lo…
This year’s event, which takes place Aug. 15-17 in Chicago, also includes a free workshop on what you might do when starting your business over from scratch.
June 18, 2017
Protect Your Employees from Heat-Related Illnesses with…
The National Institute for Occupational Safety and Health and the Occupational Safety and Health Administration have released an updated app for smart phones that can help workers stay safe when working outdoors in hot weather.
June 17, 2017
Visser, Ball Partner on New Sticking Technology for Cut…
The new AutoStix system is designed to provide better consistency and uniformity with shipped cuttings, easier and more reliable counting, automatic transplanting, and optional buffering in the peak season.
June 16, 2017
Five Guidelines to Investing in Software for Your Green…
Any software improvement you make should make sense for your team and be worth the investment.
June 15, 2017
Greenhouse Grower’s 2017 Evening Of Excellence Will Rec…
Registration is now open for the 2017 Greenhouse Grower Evening Of Excellence, which takes place Monday, July 17, during Cultivate’17.
June 14, 2017
Plantpeddler Hosting Variety Day on Aug. 4 in Cresco, I…
The free event will allow attendees to tour Plantpeddler’s trial gardens, which include more than 1,200 varieties of vegetative annuals displayed in large containers, baskets, window boxes, and beds.
June 13, 2017
Are Your Geraniums Showing Signs of Iron or Manganese T…
Zonal geraniums with low pH can exhibit iron and manganese toxicity symptoms, including marginal chlorosis, leaf speckling, and upward-cupping of the leaves, according to Michigan State University experts.
June 13, 2017
New Research Explores Potential of Using Steam or Hot W…
USDA-Agricultural Research Service horticulturist Dr. James Altland is exploring an alternative method for controlling weeds in greenhouse propagation systems by using steam or hot water to kill weed seeds.