December 22, 2010
How Dirty Is Your Water? Ready Research Results
During summer 2009, we collected irrigation water samples from 24 greenhouses and nurseries across 11 states in the United States as part of the Young Plant Research Center program. We evaluated physical, chemical and biological water quality and determined whether current treatment practices were maintaining water quality within recommended guidelines. Table 1 summarizes our results for up to the five types of samples we collected in each location: • “Source” water samples were the municipal or well supply collected at the first access point after entering the greenhouse. • “Furthest outlet” samples were collected from a boom, emitter or hose after traveling within the irrigation plumbing the furthest distance from the “source.” • “Bench and floor” samples were collected from ebb and flood irrigation water before treatments such as filtration were re-applied to the return water. • “Tank” samples represented irrigation water stored in concrete-lined tanks indoors. Samples had been […]
January 23, 2010
Understanding Plant Nutrition: Managing Multiple Species
Multiple species are often grown in the same greenhouse section, or even in the same container. Often, these species have different acceptable pH ranges and iron requirements (Table 1), which can lead to growing difficulties that affect plant quality. In this final article, we give tips on managing multiple crops in the same greenhouse. Management Tips Organize greenhouse zones so plants are grouped by similar nutritional requirements. One of the most useful groupings is based on the plant’s ability to absorb iron from the soil solution (Table 1). For example, grouping all iron-inefficient species together and away from all iron-efficient species will simplify your nutrition program because all the plants in a specific group should be able to be treated the same. Other factors to consider when grouping plants include acceptable EC levels and fertilizer requirements, light requirements (both intensity and day length) and moisture requirements. If […]
January 16, 2010
Understanding Plant Nutrition: The Complete Series
An Introduction Read about the basics on essential nutrients for plant growth, uptake of nutrients and pH’s effect on nutrient solubility. Nutrient Sources The authors take a look at the myth that cation exchange capacity is important to soilless media. Limestone And pH Why does limestone need to be added to soilless media? It’s all about pH management. Limestone, Calcium And Magnesium Limestone provides calcium and sometimes magnesium to container media. This article looks at the nutrient content of different types of limestone and how it influences calcium and magnesium levels. Irrigation Water Alkalinity & pH Water alkalinity and pH are two different measurements. This article explains the difference, how to interpret testing results and how to adjust management strategies accordingly. Irrigation Water As A Nutrient Source Water rarely contains enough primary macronutrients, but can be rich in secondary macronutrients. Check out this article for tips on making the most […]
December 28, 2009
Understanding Plant Nutrition: Geranium Nutrition
Seed and zonal geraniums are iron-efficient crops that are prone to iron/manganese toxicity when the media-pH gets too low. Once plants show toxicity symptoms of necrotic spots and marginal burn (Figure 1), the affected leaves do not completely heal. The only options become shipping lower-quality plants–to take additional time to produce healthy new growth that will cover the older damaged foliage–or throwing plants away. Therefore, the best approach is to prevent iron/manganese toxicity (and low media-pH) from occurring. Here are some pointers for growing geraniums: Pointers – With normal fertilization practices, the acceptable pH range for iron-efficient crops like geraniums is 6.0 to 6.6. – Pre-test your root medium to determine its acceptability for growing geraniums. Often, moistening the media to near container capacity and giving it three to seven days to incubate allows the limestone a chance to react and gives a more realistic starting pH measurement than […]
November 30, 2009
Understanding Plant Nutrition: Calibrachoa
Calibrachoa are often described as a “high feed” or “high iron” requiring crop. This is not exactly true. Calibrachoa are an iron-inefficient crop and are prone to iron deficiency because they lack the ability to take up iron from the soil solution if the media pH is too high. Once iron deficiency sets in, calibrachoa will often lose vigor and become susceptible to secondary problems like overwatering or root diseases. Therefore, to succeed with calibrachoa, you need to monitor media pH regularly and take the proper corrective actions when the media pH gets too high. Here are some pointers for growing calibrachoa. Points To Consider – With normal fertilization practices, the acceptable pH range for iron-inefficient crops like calibrachoa is 5.5 to 6.2. Once the media pH increases above 6.2, iron deficiency is likely (Figure 1). – Make sure the iron deficiency symptoms are being caused by high media […]
September 16, 2009
Understanding Plant Nutrition: Stock Plant Nutrition
Nutrient management for stock plants is similar to other long-term crops. We have worked with several leading stock plant growers both in the United States and overseas over the past decade. Together, we have found the keys for success are fairly straightforward: have an organized plan that includes media and fertilizer selection, organize crops into pH or EC groups, monitor nutrition regularly and ensure adequate levels of all nutrients are present in cuttings harvested from the stock. 1. Start with a quality growing medium. Some growers consistently produce excellent quality cuttings from stock plants grown in gravel, soil or locally produced compost to save costs. However, these locally produced substrates will often present the stock producer with challenges including inconsistent mixing, excess compaction or composting, limited root growth because of lack of aeration or excessive drying, and micronutrient toxicity (often manganese, depending on the rock type) when substrate pH decreases […]
September 1, 2009
Understanding Plant Nutrition: Poinsettias
Profit margins are extremely tight for poinsettias, so minimizing shrinkage that results from crop losses is essential. If nutritional stress occurs, you will be struggling from that point onward to produce a high-quality plant for sale. Poinsettias hang around your greenhouse for several months, much longer than short-term spring crops. Therefore, a preventative approach that breaks the crop down into stages can help avoid the usual problems. Here are some pointers to consider at each stage. Pointers 1. Poinsettias have four stages in which fertilizer needs vary: propagation, initial growth, rapid growth and flowering phases. Figure 1 represents the goals in each stage. The amount of fertilizer taken up by plants varies depending on how quickly the crop is growing. 2. During propagation, avoid solutions that have a high electrical conductivity (EC) (above 0.75 mS/centimeter) or fertilizers containing phosphorus to avoid foliar damage (Figure 3). Rooting can be delayed as […]
July 27, 2016
The Top 5 Myths About Cannabis Production Cleared Up
There is a lot of misleading information going around about growing cannabis. Industry insider James Lowe makes sure you know the truth about cannabis production.
July 26, 2016
SAF Partners With Cornerstone Government Affairs To Adv…
A new partnership between the Society of American Florists (SAF) and Cornerstone Government Affairs ensures that SAF will continue its highly effective work advocating for issues that affect the floriculture industry. “SAF and Cornerstone together provide experienced voices on Capitol Hill to protect our growers’ interests,” says SAF CEO Peter Moran. “We’ll continue to move major policy priorities forward on behalf of small business and agriculture.” Cornerstone is a public affairs firm specializing in government relations, strategic consulting, and advocacy. Its team of more than 50 senior professionals includes former senior professional staff from both authorization and appropriations committees and the U.S. Department of Agriculture (USDA), as well as veterans of the horticulture industry. Agricultural and horticultural issues of primary concern to SAF members include access to labor, immigration, crop protection, international trade and other matters related to the day-to-day operations of growers. Before she retired this year, SAF lobbyist Lin […]
July 26, 2016
AFE Releases New Videos Highlighting Industry Successes
The American Floral Endowment (AFE) recently released five new videos, created to highlight floriculture successes through industry collaboration, support, and participation. “Each video shares real stories from industry members on career development through scholarships and internships, and true examples of research solutions that have shaped how the industry operates today,” says Laura Shinall, President of Syndicate Sales, Inc., and AFE Public Relations and Development Chair. “We’re excited to be able to share some great success stories in an effort to increase industry participation.” The introductory video “Heard of the American Floral Endowment?” helps educate those who aren’t currently aware of AFE’s programs, while other segmented videos (retail, wholesale, grower) share how Endowment programs complement each group and why it’s so important that everyone in the industry participates: Retail Florists Share Why They Turn to AFE New Resources for Floral Wholesalers and Suppliers AFE Helping Growers Profit Ready for a Career in Floriculture or Horticulture? […]
July 26, 2016
How Your Retail Plant Sales Practices Compare
Editor’s note: Greenhouse Grower RETAILING asked growers and retailers to share their pricing methods in a survey sent out in mid June 2016. Of the 362 responses, 202 arefrom those whose primary business is garden retail. We will be sharing the results of what we learned throughout July, August, and September 2016. Discounting plants is a finely wielded weapon for plant retailers, Greenhouse Grower RETAILING‘s Plant Pricing Survey shows. It will come as no surprise that just about everyone holds sales at some point (93%). And so it makes sense that some expertise is shown. Take this first graph as an example. The most perishable plants — small annuals and vegetables — are the most likely to be placed on sale. That seems counter-intuitive. Why place the fastest turning inventory on sale? But when we took a closer look, we found that these sales are being used to lure […]
July 25, 2016
How You Can Stop Aphids By Understanding Their Interact…
Knowing which aphids target which crops and how aphids colonize and move on plants goes a long way toward setting up an effective management plan.
July 25, 2016
Cultivate Keynote Speaker Highlights Seven Principles O…
In his morning keynote address at Cultivate’16, best-selling author and speaker Jeremy Kingsley noted that if you want to make your business better, the process should start with making your people better by inspiring them.
July 24, 2016
Horticultural Lighting Conference To Take Place In Chic…
The one-day event is designed to provide cutting-edge information on the latest technologies and techniques impacting the advancement of the horticultural lighting market.
July 23, 2016
AmericanHort Kicks Off Cultivate’16 By Announcing Major…
Even though Cultivate’16 just wrapped up, it’s not too early to find out about the many changes you can expect for 2017.
July 22, 2016
Pleasant View Gardens Targets Millennials With Savor Ed…
Taking something as ubiquitous as vegetables and herbs and giving it a fresh new look is no easy task, but Pleasant View Gardens took on the challenge with extensive research and creative marketing.
July 21, 2016
Dümmen Orange Opens New North American Headquarters In …
The new office, which officially opened during Cultivate’16, supports the company’s vision to be integrated into a vibrant and inspiring community, and provides a bright, modern workspace for its approximately 30 local employees.
July 20, 2016
Sakata Seed Develops World’s First Pollen-Free Lisianth…
With no stamen to produce pollen, the new Lisianthus varieties have improved flower durability and the benefit of no scattered pollen that can cause staining of flowers and machines.
July 20, 2016
Research And Commercialization Unite At The New Vinelan…
The new, pre-scale commercial greenhouse facility at Vineland Research and Innovation Centre in Vineland Station, ON, will help accelerate the commercialization of innovative technologies and products coming out of research.
July 20, 2016
First-Ever Flower Run Was A Big Success, Luxflora Says
Kicking off Cultivate’16 on Sunday, July 10, Luxflora’s first annual 5K saw nearly 150 participants racing through the picturesque Scioto Audubon Park in Columbus under clear blue skies and perfect conditions. It was a great way to start the week, participants said. Congratulations to the winners of the first-ever Flower Run: First Place: Jacob Griffith Gardner Second Place: Mike Goyette Third Place: Jack Ford The top three winners — and all of the Flower Run participants — were showered with flower petals when they crossed the finish line, making for a colorful and fragrant finish to an invigorating experience. “Personally, I would consider it a grand success,” says Luxflora President Rebecca Lusk. “The overall mood was fantastic, from start to finish. There were many high fives and group hugs, numerous duo phone selfies and postings to social media, while participants enjoyed their bananas and bottled water donated by Experience Columbus. Most […]