Cultivation

Compact cultivation of kalanchoe without the use of Tilt

Van der Knaap has researched compact cultivation of kalanchoe in collaboration with the growers of Blos5. Blos5 is a cooperative of kalanchoe growers who work together in the…

Cultivating Lilium Table Dance in an aquaponic system

Aquaponics is the integration of aquaculture and hydroponics in a recirculation system, where aquatic animals like fish, molluscs, crustaceans and aquatic plants are connected with the production of vegetables in a controlled environment, nutrients reach the system through the feeding fish and bacteria…

Research into the quality of drainage water in soil-bound crops

In 2030 all Dutch growers will have to reuse the drainage water in their greenhouse. But with soil-bound crops, much is still unknown about the quality of that water. That is why the Greenhouse Horticulture and Flower Bulbs Business Unit of Wageningen University & Research is investigating the quality of…

"Prevention is better than cure"

An apple a day, keeps the doctor away, goes the popular proverb. The wisdom behind prevention is better than cure has been around for a long time and suggests that we need to be more proactive than reactive in our daily diet. by Daniel Than This is no different in horticulture. We see this principle being used in Integrated Pest…

What type of lighting is right for my indoor grow?

When it comes to fueling plant growth, lighting is one of the main ingredients of a maximum yield recipe. Figuring out if you want full natural sunlight only, a mixture of…

The effect of salinity on the growth of lavender species

Long term degradation of water quality from natural resources has led to the use of alternative water resources for irrigation that are saline. Saline water irrigation in floriculture for the production of nursery crops requires an understanding of plant response. The pot growth of four lavender species…

the coronavirus and the glasshouse industry

"We can build on hygiene procedures, now focussing on staff health"

In the new world of Covid-19, one thing is for sure, the safety of employees comes first. Infecting them through fellow employees endangers their health and that of their…

Petunia yellowing: Lush light green growth

Vegetatively propagated petunias are considered heavy feeders, needing a higher nitrogen rate of 200 to 300 ppm. When fertility rates become excessive, lush growth can occur. by Brian E. Whipker - bwhipker@ncsu.edu  On a greenhouse visit, a group of petunia hanging baskets were observed with lush growth and…

"Devastating"

Growers fear lack of migrant workers Canada

All agriculture seasonal worker programs have been affected as travel bans have been put in place until further notice, Canadian growers say. They start looking for local workers and try to lobby to adjust the rules to secure enough labour during the upcoming season. Ontario farmers say they're worried…

US (NH): Cold-hardy hydrangea study to help regional cut flower and landscape industry

New Hampshire has seen a dramatic increase in cut flower farms, underscoring the need for reliable research to support the state’s flower industry. To that end, University of New Hampshire researchers have launched the first study to evaluate plants from three cold-hardy hydrangea species for cut flower…

Sustainable cultivation in the greenhouse: higher production, lower footprint

It sounds too good to be true: a higher production, and at the same time a lower footprint. But it is possible, as shown during the 'Greenhouse2030: Sustainable cultivation with a future' project of the Greenhouse Horticulture Business Unit of Wageningen University & Research. The project investigates…

Faster plant growth through more efficient photosynthesis

As a result of climate change, the amount of arable land is shrinking, while the world population is on the rise. This is why Wageningen researchers are studying ways to reduce the required soil area of crops. They have discovered that some plants make better use of light for their growth than others. By…

Why tulips grow best in cold weather

Tulip bulbs, also known as modified roots, follow their own rules when it comes to growing. Unlike other flowers that will start to bloom as the days lengthen with the coming of spring, tulips will only start to flower when they are ready. Tulips also don’t like the heat given off by too much direct…

Barendse Freesia innovates with high tech three-tier cultivation

In 's Gravenzande (the Netherlands) two brothers, Lex and Matthieu Barendse, established a climate chamber in which, under LED lighting and fully conditioned circumstances freesias are grown in a three-tier system. The brothers are past the experimental phase, the first stalks have been harvested.…

LED does not cause a delay in flowering with chrysanthemum

Branch weight for chrysanthemum in a winter cultivation under LED lighting is lower than expected. That was a result of an initial study in a 1000 m2 demonstration greenhouse, by Business Unit Greenhouse Horticulture of Wageningen University & Research (WUR). Nevertheless, the results offer sufficient…

Are your plants suffering from nutrient burn?

One common problem that many indoor growers run into is the leaves of their plant's browning, curling, and drying out around the edges. The most likely cause is nutrient burn.  While nutrient burn can sneak up on even the most experienced growers, it can be something to consider if you're new to fertigation.…

March 17, Benton Harbor

US (MI): Irrigation update for specialty crop producers

Vegetable, fruit and specialty growers in southwest Michigan and northwest Indiana may want to take advantage of a Specialty Crop Irrigation Meeting on March 17, 2020, at the Southwest Michigan Research and Extension Center, 1791 Hillandale Rd. Benton Harbor, MI 49022. The meeting will run from 9 a.m. to…

Plant Empowerment: a stress-free future for all plants

Plant Empowerment is synonymous with Next Generation Growing, where stress is no longer a factor. The use of climate screens can prevent plant stress to a significant degree. This in turn results in greater efficiency. Reason enough for Svensson to support a book and platform on this topic. Plant Empowerment – also known as…

US: 2020-21 PGR Guide for Perennials now available

The newest PGR Guide for Perennials – and the largest edition to date – is now available from Fine Americas, a specialist in plant growth regulators (PGRs). “Our focus on PGRs and only PGRs makes producing this tool for growers a natural fit, and with the 2020-21 perennials edition, we’ve added even more…

Ellepot GrowBag and AIR Tray

Plastic bags no longer needed in propagation

Following on their success within the fruit and nut segments, the company has developed the Ellepot GrowBag, which along with their AIR Tray technology, eliminates the requirement for plastic bags in propagation. "With the new GrowBag and AIR tray system, growers can eliminate the need for plastic bags…

LED supplemental lighting providing red and blue radiation = purple leaves on some young plants

Don’t be alarmed if some of your crops turn purple under LED supplemental lighting providing red and blue radiation. by Roberto G. Lopez - rglopez@msu.edu From October to March, the accumulated amount of photosynthetic light that plants growing in greenhouses receive over the course of the day or the daily…

Responses of ornamental plants to complementation with monochromic or mixed red-blue LEDs

In a new study, inch (Tradescantia zebrina) and spider (Chlorophytum comosum) plants were grown in a growth chamber for two months in plastic containers to evaluate the effects of different light treatments (TO Tube luminescent Dunn (TLD) lamps or control), TB (TLD lamps + blue light emitting diodes…

More light ensures higher production of Alstroemeria

A higher light intensity ensures a higher production of Alstroemeria. Moreover, the lamps ensure that less fossil fuels are needed. This is the conclusion of research by the Business Unit Greenhouse Horticulture of Wageningen University & Research into climate-neutral cultivation at Alstroemeria. In the…

Planting Bletilla in the Westland

Ever wondered how Bletilla is planted? Thanks to Green Works, that won't be a mystery anymore. In this video, they give a little insight in planting their Bletilla in the greenhouse in the Westland, the Netherlands.  For more informationGreenworksEd KleijbeukerM: +31 (0)6 24 94 64 05Ed@green-works.nlDaan KneppersM:…

Tulips grow in winter, thanks to the summer sun

Tulip flower growers use their greenhouses mainly in winter and spring. In these periods the greenhouses have to be heated. In the summer the greenhouse is empty, while at that very moment energy is free, thanks to the sun. Business Unit Greenhouse Horticulture and Flowerbulbs of Wageningen University &…

"Fire up the injector - It's calibration time"

As we get closer to the beginning of bedding plant season, growers all over are dusting off their sprayers, checking heaters, and performing early-season maintenance on different systems and pieces of equipment in their greenhouse operations. The question for this week is: have you checked on your…

"Stomata monitor offers promising perspectives"

It is still a significant challenge to accurately monitor the stomata conductivity (Gs) of a crop under practical conditions. There is much to gain by achieving insight into…

Bumblebees carry heavy loads in economy mode

Bumblebees are the big lifters of the insect world, able to fly back to the hive with almost their own body weight in nectar on board. A study published Feb. 5 in Science Advances shows how they do it — and that bees can show more flexibility in behavior than you might expect from a bumbling insect.  “They…

Tips for rooting difficult or slow-to-root cutting

Exogenously applied rooting hormones can increase rooting percentage and uniformity of difficult or slow-to-root genera. by Roberto G. Lopez - rglopez@msu.edu As shipments of unrooted cuttings (URCs) will be arriving soon, it is important to review the list of genera that can sometimes be problematic for…

US (CT): New study identifies ornamental nursery plants used by honey bees for pollen

The nursery industry sells over $4.3 billion worth of ornamental plants in the United States each year, representing a tremendous investment in the appearance of our managed landscapes. Current concerns about the health of pollinators generally, and honey bees in particular, raise the question – Are we…

Are you ready to grow in 2020?

In this first Grower-to-Grower article of 2020, Dennis Crum shares his list for pre-spring season planning. Give your crops a head start by taking care of business before the growing season begins. After 25+ years of growing at Four Star Greenhouse, Director of Growing Operations Dennis Crum and his team of growers have…


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