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April 20, 2005
Reducing plant handling costs is a goal of most greenhouse businesses. Carrying plants is time consuming and heavy work. It is also expensive. There are many systems that can be used to reduce this task and its cost. Purchase decisions should be...
March 24, 2005
Management of soil-borne diseases is critical in greenhouse and nursery production. Soil-borne diseases are caused by the pathogens Pythium and Rhizoctonia (damping off), Thielaviopsis (black root rot) and several other root rot and wilt organisms...
March 04, 2005
With spring season nearly upon us (or in full swing for those growers far south and west), everyone is getting extremely busy taking care of all those crops in the greenhouse. Days are full of transplanting, watering, moving crops, spraying and...
January 25, 2005
You could receive a perfectly healthy liner or plug, but without correct fertilization crop quality (and profit) will quickly go downhill. Because the wide range of plant species we grow differ in nutritional needs it is often difficult to grow...
January 25, 2005
Most materials that growers receive are handled on pallets. Bags of growing mix, bundles of containers, fertilizer and construction materials require less handling labor when pallets are used. Fortunately, there are many pieces of equipment that...
January 25, 2005
Elephant ear or taro (colocasia) has been increasing in popularity because of both the wider range of color choices and improved cold hardiness. The species, Colocasia esculenta, produces 5- to 7-foot-tall plants that have very large (3 feet),...
January 25, 2005
With its robust evergreen foliage and impressive late winter to early spring blooming display helleborus has caught interest from gardeners, landscapers and perennial enthusiasts everywhere. It has gained such popularity that the members of the...
December 16, 2004
A variety of commercially prepared potting mixes are available for today’s commercial growers. Selecting the formulation that performs best for your particular situation can be a difficult task, unless you know the specific needs of the crop, your...
November 11, 2004
My wife keeps telling me I should stop playing softball. She says I’m getting old. My answer, “And?” I went to play anyway, like any good warrior would and ran into an opponent I used to play against when I was…younger. We briefly reacquainted...
November 11, 2004
In my 18 years of working with plant growth regulators (PGRs), I have never had a more active research year; we have worked with more potential PGR products this year than ever before and are also seeing a lot of interest in applying old chemistries...
October 13, 2004
While visiting a grower the other day and going over his crop of pansies, mums, and flowering kale and cabbage, the main comment I had was that the plants looked like they needed more feed for growth to cover up the pots. The grower said he was...
October 13, 2004
Whiteflies can be difficult pests to manage, especially in greenhouses where they enjoy a high-quality food supply, favorable environmental conditions and minimal protection from natural enemies. Whiteflies damage a number of crops: verbena, fuchsia...
October 13, 2004
In Part I (GPN September 2004) we discussed what happens to plant growth when we grow crops cooler. Here, we will discuss how dropping temperature affects diseases and insects. In addition, to help you decide if there is a benefit for your business...
September 13, 2004
With fuel prices escalating this fall, now is a good time to evaluate how efficiently you are using the growing space in your greenhouses. The cost of providing the right environment is the same whether you are utilizing 50 percent of the space or...
September 13, 2004
Powdery mildew is one of the most common types of diseases on ornamentals. Some common hosts include rose, gerbera daisy, salvia, pansy, hydrangea, begonia, African violet, crape myrtle, delphinium, zinnia, azalea, sunflower, ranunculus, grape ivy,...
September 13, 2004
While ‘Freedom Red’ was the most important poinsettia variety in most of the country over the past 10 years or so, heat delay was not a topic that was discussed very much. However, with ‘Prestige’ becoming such a popular variety, we are hearing...
September 13, 2004
It is estimated that approximately 80 percent of the cost of heating a greenhouse is incurred at night. Given the long nights of winter in the North, heating is clearly a major cost in plant production. In addition, the dramatic increase in fuel...
September 13, 2004
The first calibrachoas were introduced only 12 years ago, but this has already become an important spring crop. Its rapid growth has been both because calibrachoas are popular with consumers and because they have a good growth habit for baskets and...
August 10, 2004
Mimulus — not a crop you hear much about but should. The Magic series from Floranova grows approximately 10 inches high with flowers that are 1 3/4-2 inches in diameter. Magic has a very short production time under long days, with flowering 6-7...
August 10, 2004
In the past decade, the perennial industry has become a significant segment of floriculture crop production. Similar to vegetative annuals, new cultivars of perennials are released every year, many of which are propagated by cuttings. In most cases...