SIGN (Dutch Foundation for Innovation in Greenhouse Horticulture)

The Dutch Foundation for Innovation in Greenhouse Horticulture (SIGN) is a non-profit organisation. The SIGN1 Foundation works in alliance with InnovationNetwork2 on ground-breaking system innovations in horticulture. The aim is to contribute to a vital, sustainable and socially valuable greenhouse horticulture in 2030. SIGN develops powerful innovation perspectives with a long term vision and short-term perspectice so as to inspire and bring the sector into movement.

The Foundation is financed through government and private funds of the Dutch greenhouse sector on an equal basis (50 / 50%). Because of these funding sources, reporting is mainly in Dutch. However almost all publications have an English summary (continue to publications page).

Several of our programmes are of international importance, specifically:

Please contact SIGN at for more information or contact one of us directly (see footer).

1. SIGN is an initiative of The Dutch Horticultural Growers Association (LTO Glaskracht Nederland)
2. InnovationNetwork is an initiative of the Dutch Ministry of Economic Affairs


Lightweight floating systems
The widely used glass 'Venlo greenhouses’ have been optimized over the years. The modern greenhouses are much higher than their predecessors and therefore have more impact on the environment. A search for new architecture of greenhouses resulted in high quality lightweight ETFE foil archetypes as an innovative climate adaptive  greenhouse. It is a solution for areas were space and possibilities for water storage is limited. The floating varieties can absorb water preventing flooding in the neighborhood. Water can also serve as a transport medium, it provides additional thermal mass and stabilizes the greenhouse climate. SIGN and Waterarchitect Van Bueren studied the growing financial and political feasibility of various structures.

Dutch Greenhouses are usually near urban areas with a shortage of water storage, the  growing floating floor can buffer the large peak loads so that flood damage is minimized. This floor is also applicable to existing greenhouses, saving long expropriation or loss of the existing greenhouses. This now patented floating floor system is also suitable for functions such as floating boulevard, park or gardens. SIGN is looking for partners to exploit the system.


WorkisGaming: gamification of horticultural labor

WorkisGaming integrates elements from the game industry into workflowmanagement systems creating a modern, attractive work environment. The relationship between employee, employer, and production is more fun, challenging, and smarter.


Polydome (High Productive Polyculture Systems)

Polydome was developed as part of a fundamental solution to the world food production in order to achieve higher yields with less environmental impact than conventional agriculture.


Building with Green and Light

In the Netherlands, we have acquired a new understanding of how to use energy, light and heat. SIGN / Innovation Network developed a sustainable programme in close cooperation with the horticultural sector: Greenhouse as energy source. The same techniques from these revolutionary greenhouses can be used to transform buildings from energy consumers into energy providers. Moreover, we can ensure that a great deal of daylight can be introduced into buildings without the negative effects of overheating.

Of course, we want our homes and offices to be both sustainable and comfortable. Plants contribute to comfort by improving indoor air quality. Research shows that plants have a relaxing effect on people and that patients surrounded by plants recover faster.

SIGN / InnovationNetwork initiated the concept of Building with Green and Light in 2006. The first publication sold out quickly and many Dutch architects and real estate developers embraced our new concept. In the BNA Academy (Dutch Architects Union) we train architects to design buildings incorporating the new philosophies from Building with Green and Light.

Now is the time to share our newly acquired knowledge internationally. The book Building with Green and Light - available in English, French, German and Dutch - combines our knowledge on energy techniques with our knowledge of how to use plants for healthier indoor climates. Most of the projects used as examples are Dutch; we hope they will inspire readers to start up new projects that incorporate plants, daylight and sustainable energy solutions.

Waard&vol Groen

Dewi HartkampDewi Hartkamp
+31 (0)6 53 13 19 44
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Dewi Hartkamp op Twitter

Logo Glastuinbouw Nederland Stichting Innovatie Glastuinbouw (SIGN) is een initiatief van Glastuinbouw Nederland. SIGN heeft voor de uitvoering van haar werkprogramma een alliantie met het ministerie van Landbouw, Natuur en Voedselkwaliteit (LNV).

Peter OeiPeter Oei
vanuit min. LNV
+31 (0)6 51 54 28 82
Email Dewi Hartkamp