June 18, 2008

Insights on Retractable Roof Greenhouses

Retractable roofs first came on the production greenhouse scene in 1991. In these past 16 years what have we learned about their role in cooling, ventilating and shading? The concept of opening the greenhouse’s roof to get cooler air to plants is a logical one that most growers are catching on to, according to Richard Vollebregt, President of Cravo Equipment Ltd., Brantford, Ontario, Canada. Long growing seasons, varied needs of plants and changing weather conditions make retractable roof greenhouses and their versatility an asset. This January, a freeze surprised growers on the West Coast, where the promise of mild temperatures lulled growers into leaving crops unprotected against the elements. “The plants that were in the greenhouse were okay,” Vollebregt says. “What happened to all the plants that were outside? They died.” The balance between healthy, strong plants that are grown outside and protected plants in the greenhouse that need to […]

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June 18, 2008

Nurturing Urban Gardens

An urban garden in St. Louis will be able to produce more fresh produce for its neighborhood this spring thanks to a new greenhouse it received from Nexus Corp. as part of a national contest. New Roots Urban Farm was chosen as the winning entry. The nonprofit was founded by four friends in 2004 to provide healthy, locally grown food for the impoverished neighborhood located between St. Louis Place and the city’s Old North neighborhoods. No grocery stores are available within walking distance to offer healthy food options. The consensus-based collective is dedicated to serving as a model for urban agriculture, food security and self sustainability. Last year, the farm harvested more than 3,000 pounds of fresh produce and distributed it through its farmers market, which accepts food stamps, and through food pantries, churches and community centers. With the new Cultivator Premier Kit Greenhouse from Nexus, the farm will be […]

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June 11, 2008

Building A New Greenhouse

So you’re thinking of building a new greenhouse? Here are some tips I’ve learned building our new propagation range in Fresno, Calif. The first thing on your list should be to create a master plan on how your structures will be laid out now and potentially in the future. This should include all utilities entering the greenhouses and any special requirements for your equipment. You might not build on your greenhouse for a while, but you should always give yourself the option of adding on in the future without any obstructions. Questions you need to address during this process: - Can the new greenhouse(s) be built on our existing property without any modifications? - Do we need to move older structures to accommodate our new greenhouses? To keep the flow of your new greenhouse, it might be better to move some of your existing structures. - What are the timelines to […]

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June 11, 2008

What’s Old Is New Again

When it comes to structures, growers in the United States often look overseas for trends and technologies that will hit the U.S. shores in the future. There’s a new design concept brewing in Holland for the breeder Anthura B.V. Anthura set out to build a new greenhouse that would centralize young plant production for the Anthura Plant, Anthura Microplants and Anthura Production departments. The design of the Palm house of the Royal Botanic Gardens, Kew in London was the source of the new design, which incorporates curved sidewalls and a second story. The greenhouse is being built by JM van der Hoeven B.V. under the guidance of architect Aad Bom. The construction is due to be completed by the end of 2008. Kew Botanic Gardens  The design of Anthura’s new facility is based on the Royal Botanic Gardens, Kew, which was built in 1848. Most greenhouses of the time were built […]

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June 11, 2008

Avoiding Overheating

As much as 40 percent of the cooling requirements of a glass enclosed structure is a function of heat entering through the glass. Stopping heat at the glass is the most effective means of lowering temperatures, reducing cooling operating costs and increasing plant growth. In new construction, reducing heat at the window can mean the need for smaller and less expensive HVAC systems. You can block heat using expensive computer or manually operated shades or by applying colored coatings to glass. Shades are prone to operational problems and use energy. Colored coatings need to be removed to maximize light transmission after the hottest time of the year. For existing glass greenhouses, another option is to install clear, colorless window film that will block unwanted heat while allowing in desirable natural light. Once installed, such film may last up to 20 years. It does not need to be removed, does not change […]

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June 11, 2008

Master Builders

While most growers got into the greenhouse business because they love to grow plants, others really take pride in building greenhouses and have dedicated employees and crews. One prime example is George Lucas of Lucas Greenhouse in Monroeville, N.J. While he and his wife founded the business with just 9,000 square feet of greenhouse about 30 years ago, today Lucas Greenhouse spans 630,000 square feet and ranks at No. 100 on our Top 100 Growers. The company has undergone three major buildouts with Nexus Greenhouse Systems since 2002 and just constructed 170,000 square feet of Dual Atrium greenhouses with a glass roof and polycarbonate sides and gables using its own crews. This summer, Lucas will be adding another 130,000 square feet. Where is all this growth coming from? Young plants. Forty percent of production is propagation and prefinished plants, and the rest is finished plants sold to independent garden centers within […]

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March 19, 2008

The Liquid Crystaled Greenhouse

The Cleveland Botanical Garden has teamed with Kent State University’s Liquid Crystal Institute in an attempt to examine how greenhouse plants grow under sunlight that passes through liquid crystal windows.  The idea, highlighted in a recent edition of the (Cleveland) Plain Dealer, spawned from the botanical garden’s desire to reduce the cost of energy. If results of the experiment are positive enough, a second experiment will be conducted to determine whether ultraviolet and infrared waves can be modified enough to, perhaps, shorten the time it takes plants to grow.  And that’s where cost-saving enters play. If liquid crystals prove more beneficial in growing plants, greenhouse owners can use them instead of shade cloths to control the amount of sunlight entering their structures.  Liquid crystals aren’t common in greenhouse coverings. They’re usually found in television screens and wristwatches, but that didn’t stop Cleveland Botanical Garden from pursuing this experiment and considering […]

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October 24, 2007

Al’s Loses Roof In Wind Storm

The Statesman Journal in Salem, Ore., reported this weekend that a heavy storm ripped the roof off a greenhouse at Al’s Garden Center and damaged several other structures on the property. According to the article, the garden center’s owner Jack Bigej said the roofs on the 82 greenhouses on the property are built to withstand at least 65 mph winds. Fortunately, none of the damaged structures housed poinsettias. Damage to the poinsettia crop would have been a hard hit to the business, Bigej said in the article. The National Weather Service is working to determine if a tornado touched down in the area. In addition to the production facility in Hubbard, Ore., near Woodburn, Al’s has retail locations in Portland’s suburbs Sherwood and Gresham. Al’s Garden Center happens to be our October cover story. Read it here.

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June 27, 2007

Virtual Greenhouse

Build the perfect greenhouse or upgrade your existing facilities by experimenting via computer. Find out how much it costs to heat with different fuels, heating schedules, heaters, building designs and materials. Download the software developed by USDA’s Agricultural Research Service in Toledo, Ohio, at: http://www.ars.usda.gov/services/software/download.htm?softwareid=108

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May 16, 2007

Fire At Bonnie Plant Farm

A fire broke out Monday afternoon at Bonnie Plant Farm’s greenhouses in Nora Springs, Iowa, resulting in the loss of $45,000 worth of tomatoes, flowers and herbs. For the news story, visit: http://www.greenhousegrower.com/bridge/wcfcourier.html

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February 21, 2007

Growers And Retailers Share Snow Stories

On The Radio In Buffalo We are a full-service retail florist in Buffalo, N.Y., with a half acre of greenhouses. We had our localized storm on Oct. 12 and 13, where 22 inches of snow brought down tree branches that had not shed their leaves. Eighty percent of the area was without power for several days and we lost 240 panes in the greenhouses. Hortica Insurance took care of this nicely. For Valentine’s Day, we had about 400 deliveries to make in one day. The threat of the storm was frightening, but love must prevail. Our talk radio station, WBEN, where we were advertising called my brother Frank (the oice in our ads and dispatcher of our drivers) on Tuesday afternoon to ask if they could do an on-air phone interview on Valentine’s morning, which he agreed to. The next morning they announced they would be interviewing Frank Mischler of […]

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