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January 13, 2016
For those who are unfamiliar with my work, I am the nursery and floriculture advisor for San Diego and Riverside counties in southern California. My duties include conducting extension research and education programs with emphasis in improving...
January 13, 2016
Welcome to Crossroads. We understand that you must wear many different hats in today’s greenhouse production, and we want to help you decide what needs your attention and what is not as critical. We will be trying to describe in the most...
November 14, 2015
Does it seem like every time you turn around, you are hearing about a new disease, insect or weed? The better our diagnostics are, the more things we find. It is also common that new plant genera or species might be accompanied by new problems. So...
November 14, 2015
Question: What is the difference between azadirachtin and neem? Answer: Neem is not a single substance but is a general term for both azadirachtin and neem oil, which are derived from the neem tree, Azadirachta indica. The seed kernels contain the...
October 23, 2015
The majority of the greenhouse vegetables we grow for the end user are produced from seed. Some of us start with plugs from a propagator, but they too must start from seeds. That makes the diseases of vegetables nearly the same as those of bedding...
September 22, 2015
A common question I’m asked is what the best lighting strategy is to promote early spring flowering of bedding plants and/ or herbaceous perennials. The answer to such a question is situational, depending in part on the crops being grown, the...
September 22, 2015
In recent years, coreopsis has become one of the most popular genera of perennials. It’s easy to see why when you witness their eye-catching display of vibrant blooms. The past decade has brought a colorful palette of new coreopsis cultivars to the...
September 22, 2015
It’s not that often a new variety comes along that captivates the industry with not only its stunning appearance, but also possesses the attributes of easy-to-grow, long-lasting shelf-life, great garden performance throughout the season, and the...
September 22, 2015
At Pacific Plug & Liner we continually strive to be one of the must-see stops along the Spring Trials circuit. Our goal is to display a wide selection of new introductions, not only our own but many from different vendors, including Cohen,...
September 22, 2015
Peat has played an important role in horticulture for decades, but concerns over rising costs and environmental effects caused by its harvest have spurred on efforts to find alternative media components. Similarly, environmental issues related to...
September 22, 2015
Editors note: this is the second article in a series on research and education programs being performed at the University of California. My laboratory has focused on the broad area of (integrated pest management) IPM in floriculture for more than 35...
September 22, 2015
For the past 16 years, GPN and Nexus Greenhouse Corp. have been recognizing outstanding college students with the GPN/Nexus Intern of the Year Scholarship. Each year we get an outstanding crop of applicants — students that are doing amazing things...
August 05, 2015
 In recent years, breeders have been working diligently to improve the attributes of bee balm. The monarda Balmy series is a great example of these efforts. The Balmy series is compact,  has very mildew resistant foliage and produces an...
August 05, 2015
Herbs represent one of the fastest growing groups of plants over the last 15 years or so. Many are produced from seed directly or via plugs while others are produced from herbaceous cuttings. They are often finished by the same growers who produce...
August 05, 2015
Editors note: This is the first article in a series on research and education programs being performed at the University of California. James Bethke and staff working with local rose growers on mite resistance issues. The first and second Organic...
July 09, 2015
Many large-scale commercial growers utilize automated booms to deliver water, nutrient solutions, pesticides and/or plant growth regulators to crops. Some growers have also installed lights on their booms to deliver photoperiodic lighting to promote...
July 09, 2015
Pinpoint accurate forecasting helps Bela Flor Nurseries meet demand without spoilage or delays. When it comes to customer satisfaction, few criteria rank as high as receiving things on time. Whether you’re talking about your hourly news fix, your...
July 09, 2015
Today, fresh water supplies for agriculture/horticulture are a serious matter. For some, future supplies are questionable. Many growers are faced with water use restrictions. It’s not a surprise that officials often feel that water is needed more...
July 09, 2015
In June, you read about some of the overall trends we observed during our week-long trek through California. This month, we would like to focus on the impressive new varieties that made their debut in April. These introductions stood out and grabbed...
July 09, 2015
When I was young, the United States had a vital localized independent distribution of flowering plants. Big box stores did not exist, and yes we still wrote using stone tablets, and bread was a nickel a loaf… but in all seriousness, even in the Los...