June 12, 2017
How to Improve Customer Success by Adding Residual Fertilizer to Your Plant Products
Even if it costs a few cents more per pot or extra labor, your customers will thank you with repeat sales.
October 7, 2016
How To Train Your Employees To Read Shipping Labels Properly
Avoid costly mistakes by training your employees to accurately read shipping and tray labels with this easy, three-step method.
July 30, 2016
Select The Right Filter For Ebb-And-Flood Irrigation
This article is the fourth in a series of case studies designed to help growers Reduce, Remediate, and Recycle irrigation water as part of a multi-state research grant.
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 24, 2009
Understanding Plant Nutrition: Environmentally Induced Plants
Most nutrients are actively taken up by the plant from the soil solution. With active uptake, the plant roots use energy to scavenge the root environment for soluble nutrients. For nutrients that are taken up actively (like nitrogen or phosphorus), their concentration in the root medium (as measured with soil tests) tends to correlate well to uptake by the plant. The exceptions to this rule are calcium and boron. Calcium and boron are taken up passively by the plant. With passive uptake, nutrients only move into the plant along with the water used for transpiration. No transpiration, no uptake, regardless of the concentration of those nutrients in the soil solution. The environment where the plants are being grown will directly affect transpiration rates, and calcium and boron uptake. The types of environments that suppress transpiration can include: – Hot, humid conditions, especially when light levels have been reduced with excess […]
June 19, 2009
Understanding Plant Nutrition: Common High Media-EC Problems
High electrical conductivity (EC) in the growing medium makes it harder for roots to take up nutrients and water–it is like trying to grow plants in sea water and can result in “salt burn” (damage to sensitive root tips) and toxicity symptoms in foliage (Figure 1). In this article, we will discuss the causes and corrections of high media-EC. What Causes High Media-EC? Media-EC is a measure of the total dissolved salt concentration contained in the soil solution and is often used as a measure of the overall nutrition status of the crop. You can think of the soil nutrient level as similar to a bank account. Our account balance (media-EC) is made up of deposits and withdrawals. The deposits are made with salts contained in the irrigation water, with water-soluble fertilizer, or by slowly soluble or controlled-release nutrients. Withdrawals are made through plant uptake or leaching. The account balance […]
June 4, 2009
Understanding Plant Nutrition: Low Media-EC
When growers talk about “lack of feed” or “hungry plants” (Figure 1), the issue is usually insufficient supply of fertilizer nutrients. The easiest way to measure fertilizer level in the root media is with an electrical conductivity, or “EC,” meter. What is Media-EC? What Causes Low Media-EC? The initial concentration of nutrients in a container media is provided by the pre-plant nutrient charge, which may include lime (providing calcium and magnesium), and other fertilizers such as superphosphate, gypsum or urea-formaldehyde. Part of the initial nutrient source is immediately soluble and therefore affects the initial media-EC. Other nutrient sources are bound to the soil particles or are in a slow-release form (e.g. limestone, resin-coated fertilizers), and only affect EC as nutrients dissolve into the soil solution. Most media components, such as peat, bark or perlite supply a small amount of nutrients, whereas compost can supply significant nutrients as […]
April 25, 2009
Understanding Plant Nutrition: High ph Problems
High media-pH (above 6.4) induced iron deficiency is the most common nutritional problem for certain iron-inefficient crops (Figure 1), including calibrachoa, diascia, nemesia, pansy, petunia, scaevola, snapdragon and vinca. Plants only take up dissolved nutrients through their roots. When the media-pH is too high, micronutrients (especially iron) are less soluble and unavailable for uptake by plant roots. High-pH induced iron deficiency can develop within one to two weeks, resulting in chlorosis of new growth and overall stunting. This problem is not occurring because plants need more “feed” or are “heavy feeders.” Instead, it occurs because the iron supplied in fertilizer becomes insoluble due to the high media pH. Getting Started We have undertaken considerable research and worked closely with growers to develop strategies to rescue crops that are stressed from high media-pH. If you think there is a problem, the first thing to do is test the pH and electroconductivity […]
March 23, 2009
Understanding Plant Nutrition: Correcting Low Media pH
Iron/manganese toxicity is a common problem when media-pH drops below the ideal level in certain crops, including geraniums, marigolds, lisianthus, and pentas. As media-pH decreases (meaning the pH becomes more acidic), iron and manganese become more soluble, resulting in higher concentrations in the soil solution. For each drop in media-pH by one unit, for example from pH 6.0 to 5.0, solubility of inorganic iron in the growing medium (and availability of this iron for uptake by plants) increases by a factor of 1,000. Geraniums, marigolds and certain other species are very “iron-efficient” at taking up the soluble iron and manganese into their tissue. These species evolved to grow in calcareous (low-iron, high-pH) soils and “harvest” extra iron by exuding acid or chelating agents from their roots into the soil, growing extra root hairs and other processes. When we place those plants into an iron-rich greenhouse media and fertilizer regime, they […]
February 10, 2009
Energy-Efficient Annuals: Perfecting Temps & Light
Bedding and garden plants are the largest category of floriculture crops in the United States with a wholesale value of $1.76 billion in 2007. Scheduling these crops in flower for specific market dates, at different times of the year, can be a challenge. In addition, most bedding plants are produced when energy for heating a greenhouse is a large production cost, particularly in northern climates. To optimize the greenhouse environment and produce crops as energy efficiently as possible, more information is needed on how bedding plants respond to temperature and light. Figure 1. The effects of average daily temperature on time to flower and number of flower buds in petunia. Plants were grown under a 16-hour photoperiod and an average daily light integral of 20 molâˆ™mâˆ’2âˆ™dâˆ’1. The photograph was taken four weeks after transplant from a 288-cell plug tray. During the past several years, we have performed greenhouse experiments […]
January 6, 2009
Understanding Plant Nutrition: The Series
Understanding Plant Nutrition: An Introduction Read about the basics on essential nutrients for plant growth, uptake of nutrients and pH’s effect on nutrient solubility. Nutrient Sources: Media Cation Exchange Capacity 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 […]
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.
June 12, 2017
How to Improve Customer Success by Adding Residual Fert…
Even if it costs a few cents more per pot or extra labor, your customers will thank you with repeat sales.
June 9, 2017
New Head Grower at Emerald Coast Growers is Excited abo…
Jonathan Babikow, Emerald Coast Growers’ new general manager/head grower for its Lancaster, PA, location, talks about his favorite perennials, the advantages of growing in Pennsylvania, and his future hopes for his career.
June 8, 2017
AmericanHort Update on Genetically Engineered Petunias
AmericanHort is actively assisting affected plant breeders, distributors, growers, and retailers as the genetically modified petunia regulatory response continues. Since the last update, there have been several changes to the list of petunias confirmed or suspected of being genetically engineered and therefore unauthorized to be imported or sold. Also, the list of recognized laboratories for petunia variety confirmation testing has expanded. Most importantly, petunia varieties on the USDA-APHIS Biotechnology Regulatory Services (BRS) list require an APHIS Form 2000 for importation. APHIS also began requiring that any Petunia spp. Shipments, not including regulated GE varieties, must be accompanied by a list of variety names. This resulted in some inspection delays at the USDA-APHIS plant inspection station in Atlanta over the past two weeks. In response, AmericanHort has negotiated a more flexible approach with APHIS, and new guidance has just been posted for importing Petunia plants, cuttings, or seed. The new guidance allows […]
June 8, 2017
Bailey Nurseries Expo to Take Place in Late July in Min…
This year’s expo will focus on bridging the gap with Millennials and non-gardeners through creative marketing, engaging in-store displays, and heightened customer service.