City trees fulfil numerous special functions in urban spaces. In addition to generating space, it also creates a certain microclimate or forms a biotope. In contrast to the fast-paced city, a long-lasting tree acts as an oasis of calm in our everyday hectic urban lives.
We're here to support you.
Productspecialist Dipl.-Ing. Alexander Magerl
Responsible for dealer and key account support as well as for the GEFA partners abroad. Your contact should you require solutions to problems arising when planting in urban locations.
Due to the complex conflict of interests between the benefits of city trees, for example as producers of oxygen, air filters or location enhancers, and the frequently highly practical demands placed upon them, they are frequently banished into city parks. In many areas, it is therefore possible to find a high concentration of trees in city woodland or parks. In recent years, the trend has moved towards a new perspective in urban planning regarding the use of trees to line roads. City trees are increasingly profiting from the growing number of environmental issues affecting urban spaces. It has been well-known for some time that trees can efficiently deal with fine particulate reduction in inner city areas. City trees have also verifiably proven to be a value-adding factor on the housing market. Those looking for homes are specifically seeking “green” spaces in the immediate vicinity of their new residences. It is therefore certainly possible to assume that city trees will in future play a larger role in urban spaces again. And yet the successful integration of trees into cities and towns is frequently difficult. If a tree is planted in an inner city area, it has to adapt to a completely different habitat.
The city as a habitat
Cities are characterised by their extremely high proportion of sealed areas: dense development and paved or asphalted roads and squares. The consequence: cities are substantially warmer than in the open countryside; in addition, the sealed surfaces permit little water to seep into the ground. Underground lines and cables also restrict the root space for trees and shrubs. In addition to drought and heat, nutrient depletion along with severe ground compaction and therefore oxygen deficiency lead to stunted growth, or the trees become susceptible for diseases or pests.
Overview of the problems:
• Too little root space overall
• Severely compacted ground
• Oxygen-deficient ground
• Insufficient dewatering
• Insufficient tree grates
• Use of high levels of de-icing salt
Tree location and road construction are not usually executed in harmony with each other. To be able to fulfil road construction requirements, an enormously-high level of compaction of the base course is necessary. Accordingly, the growth conditions deteriorate for the affected trees. Through compaction, the water and air storage capacity are further restricted. The tree is subjected to extremely poor conditions for growth.
TreeParker® – The advantages
• Flexible, modular construction
• The substrate is not compacted
• Variable heights 300 mm – 1500 mm
• Can bear up to 15.5 tonnes axle load
• Inexpensive entry-level price
• Easy to fill through large openings
• Large amount of space for roots to grow (approx. 92%)
• Can be installed offset
• Practical clip system
Installation – easy, quick and modular
TreeParker® combines the flexible installation of the individual modules with an extremely high load capacity (up to 15.5 t axle load). In this way, the most important factors for the planning and installation of a modern tree location are conjoined, and simplify the issue of dealing with increasingly complex plant locations in inner city areas for planners and executing companies.
The individual system components can easily be aligned during the planning phase. One system module comprises three different elements, which however can be assembled extremely quickly:
1.Frame (one base and one head section)
2. Posts (four per module)
3. Cover (to cover up the individual modules)
The lower frames are laid out on the floor of the plant pit and connected to form a sturdy unit using the clip system. The major advantage of this is that the modules can also be connected offset. In this way, slanted and curved, but also round and oval plant pits can easily be realised. Each deck has four recesses into which the round posts are inserted during the second working step. The root chamber system as a whole is extremely flexible, as the length of the posts can also be modified on-site to fit the respective situation. These can be adapted to all dimensions within a range of 300 mm to 1500 mm, for example if height differences occur within the plant pit for construction reasons. In spite of this, the modules maintain their extremely high load capacity.
The head section is plugged onto the posts and then connected with the base section. The actual plant pit for the tree is thus left clear. The substrate can then be filled through the upper openings. Then the cover is placed on the module. After that, the modules are covered with non-woven fabric and the usual layered top structure (base and levelling courses, paving or asphalt) can take place.
Urban trees perform a wide range of special functions in city environments. Beyond shaping space, they create a specific microclimate. In contrast to the fast-paced city life, trees serve as a calming presence. The TreeParker® system, developed by our partner Greenmax, is the response to new demands placed on urban tree spaces.
In the complex conflict of interests between the benefits of urban trees, such as oxygen production, air filtering, or enhancing locations, and practical demands, trees are often relegated to city parks. As a result, tree planting is concentrated in urban forests or parks. In recent years, a new perspective has emerged in planning: urban trees are benefiting from growing environmental challenges. The efficiency of trees in reducing fine particulate matter in urban areas has been known for some time.
Urban trees have been proven to increase property values, as people seeking housing specifically look for "green" surroundings. Urban trees are likely to play an even greater role in the future. However, their integration into urban spaces is often difficult. A tree planted in an urban area must adapt to a different habitat. Cities have many sealed surfaces and dense development. It is warmer, and little water infiltrates the ground. Underground infrastructure restricts root space. Drought, heat, and soil compaction lead to stunted growth and make trees vulnerable to disease.
TreeParker®
Overview of the Problem
Tree locations and road construction are, in most cases, not compatible. To meet technical requirements, a high level of compaction in the base layer is necessary. Consequently, the growth conditions for trees deteriorate. Compaction reduces the water and air storage capacity.
The solution can be compared to a basement that bears traffic loads. The soil in this basement is completely free from these loads. TreeParker® can be filled with high-quality tree substrate. It distributes the pressure load beneath the rootable volume, protecting the tree substrate comprehensively from compaction caused by heavy traffic. Thanks to the air layer between the ground and the system, the soil/root volume can expand without causing damage to the road surface.
Technical and Planning Support
We are happy to assist you in advance with planning the tree location, including the design of the rootable space, integration into corresponding planning documents (CAD), and calculation bases.
Variable system heights between 400 mm and 1,500 mm
Highly load-bearing without additional soil compaction
Provides sufficient root space for any tree species
Quick and cost-effective installation
95% of the created space available for substrate filling without compaction
Made from 100% recyclable, durable, and inert plastics.
Modular system for flexible installation (including curves up to a 5m radius).
Easy integration of existing utility infrastructure.
Water savings through optimal root space.
Also suitable as a solution for using tree locations as infiltration trenches.
TreeParker®
CHALLENGES
From an unnatural environment to an optimized location with TreeParker®
TreeParker®
Insufficient Root Space
In urban areas, trees often find limited space to root adequately and in line with their natural growth habit. This is further compounded by competition with utility infrastructure, surrounding buildings, historical underground layers, and traffic use. The tree's lifespan and development are often restricted by the available rootable volume and its quality.
Optimized Tree Locations
TreeParker® provides additional rootable space beneath sealed surfaces. The system places no restrictions on the substrate used. TreeParker® is a highly effective root management system; up to 95 percent of the system can be filled with the substrate of your choice without requiring compaction.
Relevant guidelines and professional specifications mandate the compaction of the root space (load-bearing substrate) for planting pits in urban areas. Over-compaction restricts root growth. The result: roots take the path of least resistance toward oxygen, nutrients, and water—often to the surface (typically the leveling layer beneath paving or slabs). This leads to root upheavals.
Space Below – High Load Capacity Above
The TreeParker® root management system is the response from our Dutch partner TreeBuilders to new requirements set by current regulations and green experts for urban tree quarters.
TreeParker® combines flexible installation of individual modules with very high load capacity (up to 15.5 t axle load). This brings together the key factors for planning and installing modern tree quarters, simplifying the process for planners and contractors dealing with increasingly complex planting locations in urban areas.
Vital trees are the most natural solution to mitigate the effects of climate change in urban areas.
TreeParker®
Extreme Weather Conditions
This year again demonstrates: longer dry periods and intense rainfall are increasing. The weather is becoming more extreme. In cities, the biggest problem is water. Our drainage systems are overwhelmed, leading to damage and inconvenience.
Rainwater Storage
Draining rainwater while trees in the city are suffering from drought doesn't make sense. It's more logical to let the tree benefit from the rain first and then drain the water. This requires an integrated approach and an infiltration system that works for both tree roots and rainwater management. TreeParker® combines these functions—independently or in collaboration with special systems and substrates like those from our partner Vulkatec.
Unfortunately, space constraints in urban environments are a significant challenge for planting trees. Available areas are often intersected by cables and pipes. It is necessary to combine root space with underground infrastructure.
Integration of Cables and Pipes
TreeParker® is specifically designed for urban infrastructure with numerous cables and pipes. The system can be flexibly adapted to underground conditions without surprises. Contractors can adjust it on-site in length, width, and height. Importantly, the units do not need to be connected to ensure load-bearing capacity. In about 80 percent of our projects, existing and new pipelines are integrated. Request our guide for integrating cables and pipes.
TreeParker®
Installation
TreeParker®
Installation of TreeParker® Elements
Despite the numerous design and layout possibilities, the planning and installation of the system are very straightforward. The system works roughly like a LEGO building block principle. Immediately after the system is installed, the load-bearing layer can be applied.
1
1
Preparation
Excavation of the tree pit and preparation of the subsoil to ensure stability.
2
2
Placement
The frames are placed according to the layout drawing. The units can be installed with a maximum spacing of 75 mm, allowing for curves and irregular shapes. Maximum total size: 675 x 675 mm.
3
3
Posts and cover frames
After placing the frames according to the drawing, the posts are inserted, and the cover frame is installed. The posts are available in three heights. Even during installation, the height can be adjusted to accommodate any unexpected conditions.
4
4
Posts and cover frames
After installing all units and integrating the cables and pipes, the system is enclosed by a separation layer. This separation layer can be designed to be both water-permeable and root-resistant (e.g., using geotextile fabric).
5
5
Compaction
The system can then be filled. It is important to ensure maximum compaction of the soil around the system. The tree substrate within the system itself is only lightly compacted by foot to provide the tree with the maximum soil volume available.
6
6
Air layer
The system is not completely filled; a variable air layer is necessary to prevent damage from root growth. The air layer is equipped with an aeration/irrigation system that is essential for supplying oxygen and water.
7
7
Completion
Once everything is installed, the system can be sealed. The system is also suitable for use under permeable road surfaces, as rainwater infiltrates through the covers (decks) into the tree substrate.
8
8
Tree grates
Before sealing, it is important to establish the tree planting area. All types and shapes of tree grates can be installed on the closed TreeParker® system.
TreeParker®
Selected Projects
FRANCE
Eiffel Tower | Paris
The two alleys along the tower were designed by Vogt Landscape Architects in collaboration with TreeBuilders to provide better growth conditions for the existing trees. Therefore, our TreeParker system was chosen: it provides the existing trees around this stunning World Heritage Site with additional growth space.
Parc des Ateliers | Arles
In the beautiful Parc des Ateliers in Arles, a piece of nature was also created with the help of the TreeParker system. The system gives trees the space to grow, and in turn, they provide cooling and oxygen.
BELGIUM
Mediaplein | Antwerp
The Mediaplein is one of the most beautiful squares in Antwerp, located in the heart of the city. The decision to slightly elevate the square was made to increase the rootable volume for all trees to 436 cubic meters.
Herbert Hooverplein | Leuven
The tree row from the city park was extended across Hooverplein, creating a connection with the park. TreeParker modules were distributed along the entire length of the square. The root management system protects both the trees and the square. The square is approximately one hundred meters long and finished with paving stones and concrete.
NETHERLANDS
Beursplein | Amsterdam
Amsterdam has gained a beautiful, spacious, and green square. The new appearance of Beursplein is based on the original design by Berlage. Restored elements such as drinking fountains, the bull statue, and lamp posts were returned to their original locations. Fortunately, the trees on and around Beursplein have also been reinstated.
Binnenrotte | Rotterdam
The Binnenrotte is the largest square in the vibrant center of Rotterdam. It is home to several iconic buildings, including the famous Market Hall, which measures 70 by 110 meters. The Central Library, the Cube Houses, and the Grote or Sint-Laurenskerk can also be found here. Twice a week, on Tuesdays and Saturdays, the Rotterdam Market takes place on this square.
SPANIEN
Parque del Buen Retiro | Madrid
The TreeParker® system was implemented during the renovation of Paseo de México—the main entrance route—to combine the historical ambiance with the most advanced techniques. In July 2019, work began to improve the heavily frequented route between the main entrance, the Puerta de Alcalá, and the Galápagos Pond, commissioned by the City Council.
LUXEMBURG
Skypark business center | Luxemburg
The new Moxy Hotel Luxembourg Airport offers 130 rooms with views of the airport, an outdoor terrace, and a central Moxy Bar that also serves as the reception. The current project phase involves 11 terraces, 10 of which are equipped with the TreeParker system, providing trees on the terraces with sufficient space for root development.
GERMANY
Dr.-Martin-Luther-King-Weg | Mainz
The task was to replace the plantings in the parking area and create sustainable, climate-adapted, and high-quality greenery. During the planning process, the project evolved from replacing the plantings in the parking lot to a larger renovation project encompassing all planting areas in front of the shopping center. After initial considerations, it quickly became clear that more than "normal planting pits" were needed – a system for root space expansion was required. An additional soil analysis reinforced this decision.
Client: Wohnbau Mainz GmbH Planning Office: LANDSCHAFT+ GEMEINSAM WERT SCHAFFEN Contractor: Hüfner & Kuchenbuch Garten- und Landschaftsbau Products: TreeParker®, TREELOCK®, LUWA®, LUGO tree protection grids, ARNEDO tree grates Tree Species: Amelanchier (serviceberry) and field maple
GERMANY
Maria-Stadler-Haus | Munich
The TreeParker® root management system provides sufficient development potential for the trees in the courtyard of the Maria-Stadler-Haus, a senior assisted living facility.
Company: ERLBAU Deggendorf GmbH & Co. Dimension: approx. 13 m³ root space per tree location
Street Redevelopment | Feuchtwangen
Contractors: Thannhauser Straßen- und Tiefbau GmbH, Ernst Hähnlein Bau GmbH Client: City of Feuchtwangen Modules used: TreeParker® 120 Products: LUWA® system divider, TREELOCK® Object 50
GERMANY
Fridtjof-Nansen-Straße | Traunreut
Contractor: Landschaftspflege Mayer GmbH Client: City of Traunreut Modules used: TreeParker® 120 Additional products: LUWA® system divider, TREELOCK® Object 50 underground anchoring
Rathausplatz | Tegernsee
Tree location integrated into the plaza area
Contractor: City of Tegernsee, Municipal Works Department Client: City of Tegernsee Modules used: TreeParker® 120 Additional products: LUWA® system divider, TREELOCK® Object 50 underground anchoring
As a solution provider of products that help trees survive in unnatural locations, GEFA Produkte® Fabritz GmbH utilizes state-of-the-art, high-performance plastics. These materials are essential for expanding root spaces but can also pose an environmental burden due to their durability and resilience. For this reason, GEFA Produkte® Fabritz GmbH, together with its partners and suppliers, focuses on using as much recycled plastic as possible.
Among other sources, waste generated during diaper production is used to create new material, which, together with other recyclable plastics, is utilized to manufacture components of the TreeParker® systems.
Watch the video to immerse yourself in the world of TreeParker® and learn more about how TreeParker® contributes to environmental friendliness and sustainability. Discover how waste is transformed into valuable resources.
We are here to assist.
Dipl.-Ing. Alexander Magerl | Key Account Manager | Urban Tree Planting
The certified landscape engineer is responsible for technical support and planning development of projects in urban environments. He is your go-to contact for tree planting solutions.
