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Gebr. Brill Substrate GmbH & Co. KG

The German company Gebr. Brill Substrate GmbH & Co. KG develops, produces and supplies high-quality substrates for the professional international horticulture 

Philosophy: Our first priority is to offer safe products and reliable services for the professional horticulture. We comply the requirements of our customers with respect to quality, efficiency and flexibility. 

Selected raw materials, our competent and motivated staff, certified processes and external quality controls guarantee a constantly high quality level of production. The Brill Quality Management System is certified since 2004 after the requirements of DIN EN ISO 9001 and as a member of the Gütegemeinschaft Substrate für Pflanzen e.V. (Quality Assurance Association Growing Media for Plant Cultivation) we are subject to regular rigorous external quality controls since 1998. The certification marks of CAS, France and BPF, Belgium also provide a guarantee of Brill's quality substrates.

We offer an attractive assortment of TerraBRILL hobby products


Gebr. Brill Substrate GmbH & Co. KG
Torfwerkstrasse 11 · 49828 Georgsdorf · Germany

Tel.: +49 (0) 5946-91 23 0 · Fax.: +49 (0) 5946-91 23 45
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Greenduck Gmbh

Since the foundation in 1978, kriener-potthoff continuously adapted its business activities to the changing market conditions. We have now expanded our portfolio and added new capabilities after Philip Kriener joined us as a new partner and managing director. We believe this new line-up consequently has to lead to a new corporate identity, including a new name and new appearance.

kriener-potthoff communications gmbh is now GREENDUCK GmbH.

The new GREENDUCK GmbH stands for



Corporate Identity, Corporate Design und CRM concepts.


Webdesign and IT services.


The online platform for home & garden. For professionals and hobbyists alike.


The online store featuring selected products for home & garden.


The revolutionary soil amendment for professionals and hobbyists.

GREENDUCK’s FloralDesign Edition

Publisher of floral textbooks.


GREENDUCK Inc. is your partner for the American market.

Greenduck Gmbh
Münsterstraße 111 · 48155 Münster

Tel.: +49 (0)2506/93 09-0 · Fax.: +49 (0)2506/93 09-50
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Gütegemeinschaft Substrate für Pflanzen e.V.

Trust, but verify quality
Gütegemeinschaft Substrate für Pflanzen e.V. has more than 30 years' experience in quality assurance. We also support research projects relating to substrates and contribute scientific expertise in shaping the legal framework.

The association has around 60 active members, including all leading companies from the substrate industry, even from other European countries. We work closely with scientists and people with practical business experience. These partnerships ensure that the quality assurance programmes are state of the art at all times.

Gütegemeinschaft Substrate für Pflanzen e.V. offers a quality assurance for products as followed: Bark, growing media, potting soil, expanded clay as
growing media, constituents for growing media also substrates for green roofs and substrates for tree planting. Product safety through RAL Quality Assurance is a clear benefit. In the interest of consumers and users, the programme stipulates uniform and comparable quality standards. To this end, in-house and external surveillance is carried out on a regular basis. Neutral bodies supervise compliance with the specified quality criteria. This scheme guarantees that the quality standards are met. Sealing retained samples and declaring major substrate parameters are additional factors enhancing product safety. They are an absolute must in terms of product liability.

RAL quality labels always guarantee that a product has a special, above-standard and reliable quality. The RAL seal of quality attests to the product's compliance with specified quality standards. This means definite added value to users and consumers alike.

Gütegemeinschaft Substrate für Pflanzen e.V.
Wunstorfer Landstr. 8· 30453 Hannover · Germany

Tel.: +49(0) 511/48189388 · Fax.: +49(0) 511/4818287
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Humintech GmbH

The scientific research of humic acids and their usable properties has a long tradition in Germany. The use of humic acids containing lignite in the agriculture goes back to the early 19th century. Humintech is a German technology venture, based in Düsseldorf, which ties in with this longtime tradition, manufactures humic acids based products from oxidized lignite and provides this for the agricultural, industrial an environmental sector. A special property of humic acids is their high cation exchange capacity. Hereby they can liberate trace elements of mineral origin, bound them by complexing and release them to plants as needed. In addition humic acids adjust the soil pH by their high buffer capacitiy.

PERLHUMUS® is a granulated organic soil conditioner, which consists of immediately available nutrient humus and high quality permanent humus. As ideal nutrient carrier PERLHUMUS® can be applied in combination with most fertilizers and micro nutrients. POWHUMUS® WSG-85 is the fully water soluble potassium salt of humic acids. POWHUMUS® WSG-85 as plant strengthener and soil conditioner is suited for all agricultural and horticultural plants, fruit trees, ornamental plants, turf and cereals with foliar and soil applications. As permanent humic substance it cannot be easily decomposed by microorganism of the soil. It can be used alone or mixed with most fertilizers and micro nutrients.











Humintech GmbH
Am Pösenberg 9-13  41517 Grevenbroich · Germany

Tel.: +49(0) 2181 70 676-0 · Fax.: +49 (0) 2181 70 676 22
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Planta Düngemittel GmbH

For more than 40 years PLANTA GmbH has been developing, manufacturing and commercializing fully water-soluble NPK-fertilizers.

As we manufacture in our own factory – the most modern production in Europe - and as we use only best-quality raw materials, our products are of a top quality, which is unique on the whole market. What is more, our excellent and extensive advisory services help growers to achieve optimum results.

Our product lines:
• Ferty®: Fertilizers for hard water
• Ferty® MEGA: Fertilizers for soft water
• Ferty® Basis: Fertilizers for the control of the pH-value, for very hard or very soft water
• FERTIPLANT®: Highly concentrated fertilizer, partially with urea
• AGRIPLANT®: Special fertilizers for fruit and vegetable growing
• PLANTAMIX®: Special fertilizers for substrates

Planta Düngemittel GmbH
Schwanenstrasse 22 · 93128 Regenstauf · Germany

Tel.: +49 (0)9402/81 25 · Fax.: +49 (0)9402/6530
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Plantaflor® Humus Verkaufs-GmbH

All over the world the Plantaflor substrates, soils and peat ensure an optimal growth in all application areas of horticulture.

Best raw materials of own peat fields and the supervised process on the most modern production equipments in Germany and the Baltic guarantee a constant high quality of our whole production range. Due to an intensive cooperation with research and testing institutions this production range is continually improved and developed.

Furthermore our innovative production processes make it possible for us to mix individual substrates, which are matched with the different plants and cultures according to the requests of our customers.

Plantaflor® Humus Verkaufs-GmbH
Oldenburger Str. 4 · 49377 Vechta  · Germany

Tel.: +49 (0)44 41/92 63 34 · Fax.: +49 (0)44 41/92 63 44
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Ziegler Erden

The company Ziegler

For more than 20 years, we provide our customers with quality products in the areas of substrates , bark , peat and manure. In addition, under the brand " THERMOSPAN" we produce premium wood fuels like wood pellets and wood briquettes.

At our headquarter in Stein/ bavaria we have over 20 hectares fully secured premises . This gives enough annual storage space for the commodity of about 1.000.000 m³. In addition, we have over 40.000 parking spaces for finished goods. With eight fully automated bottling plants we make over  350,000 euro pallets every year.

In our new warehouse we have space for up to 15,000 tons of wood fuel! So we can always ensure a safe delivery day by day, even in wintertime.


The company Ziegler was founded 20 years ago from the idea of natural resources and to develop their own recipes substrates of specific quality . Since then , much has changed. For example, the peat, which is broken down for us in Latvia is a high quality peat, and quality is our top priority!

The quality is constantly tested in our own laboratory under constant 
internal and external quality controls. Many of our recipes are created by
years of experience and in close collaboration with academic institutions.

Gregor Ziegler GmbH

Stein 33

D-95703 Plößberg

Tel.: Tel: +49 (0) 9636 9202-59 · Fax.: Fax: +49 (0) 9636 9202-40
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