Citygreen is the leading provider of state-of-the-art urban landscape products and services. Endorsed by professional organisations around the globe for the excellent and sustainable results they have achieved.

A revolutionary ‘hybrid’ treepit system


As an advanced structural soil cell system installed easily under sidewalks and parking lots, Citygreen Strataflow™ enables stormwater to be stored, filtered and distributed effectively for the benefit of urban trees, as well as for proper stormwater management.

Citygreen Strataflow™ combine the strongest structural modules on the market with stormwater management. Designed to use 100% recycled plastics along with engineered growth and filtration media, it’s the ideal sustainable tree growth system that can help you transform grey spaces into green.

stormwater rendering carpark kerb inlet digital size 2 strataflow Citygreen

Protect bodies of water from pollution run-off, prevent urban flooding and develop more livelier, greener spaces in cities.

Citygreen Strataflow™ is an innovative tree planting solution that creates expanded soil areas for healthy tree root growth and captures stormwater runoff from surrounding surfaces. It offers many advantages to urban environments and city landscapes, reducing pavement uplift and root intrusion, while providing trees sufficient irrigation.

Citygreen Strataflow™ makes it easy to sustain the healthy growth of city trees all while ensuring the effective management of flows (flood management) and filtration (pollutant removal).

It minimises pollutants entering waterways and bays and reduces flood risks by controlling the stormwater flow entering your city’s underground drains.

With Citygreen Strataflow™, you can ensure that your urban trees will thrive and stormwater management will be effective.

Strataflow™ Design Considerations

Soil surface area and volume

At Citygreen, we take into account the appropriate volume and size of the soil surface area to assure the best performance from the Strataflow™ system.


To ensure your tree pit does not become waterlogged, an overflow pipe is set at 50mm above the soil surface. This keeps water at its ideal level.

Extended detention depth

We ensure there’s adequate provision for ‘ponding’ between the soil and the ground surface or suspended pavement.

Growth and Filtration media

We are particular when it comes to designing and producing the media that best suits your requirements for filtration and growth.

Number and location of tree pits

In consideration with local regulations, our team performs thorough site assessments to determine the right numbers and locations of your tree pits.

Tree species

Our experts at Citygreen recommend moderate to high water-use tree species for excellent results.

Optional add-on product

The Strataflow™ Kerb Inlet

The revolutionary Strataflow™ Kerb Inlet captures stormwater runoff from surrounding surfaces, making it easier –and more affordable–to manage and re-use stormwater.

The kerb inlet allows water from the road carriageway to flow through the front grate of the drain at a capacity of up to 18 litres per second.

kerb section view 1 strataflow Citygreen
strata flow render example
Water Storage

The design also enables stormwater to be stored, filtered and distributed effectively for the benefit of urban trees.
Mounting rods included for setting the inlet, are ready for the concrete pour.

kerb 6 strataflow Citygreen
Optimal Water Flow

The body of the design is in a manifold shape, which allows for optimal water flow.
The pipe outlet socket connects with a standard 150mm/6” diameter stormwater pipes and junctions.

kerb 2 strataflow Citygreen
Flow Capture

The front grate of the Strataflow™ Kerb inlet, allows water to enter, but not urban contaminants, resulting in cleaner waterways.
Multiple units can be installed adjacent for additional flow capture.

kerb 8 strataflow Citygreen
Structural Design

Specifically engineered slope within the inlet, allows water to drain away from the carriageway, and infiltrate into the adjacent garden beds or tree pits while maintaining structural cover.

Download more information about Strataflow™ – a sustainable, ‘hybrid’ treepit system designed to manage stormwater flow and irrigate trees.

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The Stakeholders We Support

We help Stormwater Engineers

We understand you need to solve complex stormwater problems. Citygreen Strataflow™ is designed to help you achieve the best practices for stormwater treatment.

We help Civil Engineers

Affecticely combine green and blue infrastructure using Water Sensitive Urban Design (WSUD), so you can get on with the design and construction of city infrastructure.

We help Landscape Architects

Citygreen Strataflow™ is a sustainable solution that will assist you in designing attractive and functional integrated green and blue spaces all over the city.

The Benefits We Offer

  • 30+ years of relevant project experience
  • Global expertise from a proactive local team
  • Sustainability driven and innovative tree planting solutions
  • Real time updates for construction progress
  • Expert technical coordination and project management
  • Locally made Australian products
  • 20+ year warranties over all installed Citygreen systems

Case Studies

pemberton strataflow Citygreen

Innovation by Town of Pemberton combines smart water harvesting and reuse, with tree vault BMP’s by Citygreen

Watch Video
stomrwater video preview strataflow Citygreen

Video: Citygreen’s Strataflow treepit system and kerb inlet explained in practice by CEO, Ben Gooden

Watch Video
levee thumbnail strataflow Citygreen

How Citygreen’s Stratacell system including Stormwater management transformed Maitland’s historic Levee Mall

Read More
case study thumb 1 strataflow Citygreen

Innovative soil trench with water harvesting, for healthy trees in upgraded Macquarie Mall – using Strataflow treepit solution

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Enquire Online

By delivering cleaner stormwater and helping trees thrive in cities, Citygreen Strataflow™ transforms urban environments globally. It maximises tree-root growth, while providing stormwater management benefits.

For more information simply fill out the form below and our team will contact you shortly.

About Citygreen

For years, Citygreen has invested in comprehensive research and development to explore the challenges, the causes of failure and the reasons for the premature mortality of urban trees in city environments.

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Today, our urban landscape products and services are considered the top benchmark in their corresponding fields – being endorsed by professional organisations around the world and placing Citygreen at the cutting edge of sustainable landscape solutions for cities globally.

Citygreen actively contributes to a world where sustainable green spaces are within reach of every person, every day.

“Great customer service, quick response times and a very in depth QA system with constant support.”

- Laura Wiesenekker, Project Engineer, Densford Civil -

“Citygreen is a very professional  business, and I found everything was great in terms of deliveries, product supply and information. It was all forthcoming and helped us to complete the project.”

- Keith Burns, Architect/Designer, Keith Burns Architect -

“Citygreen offered training and invaluable technical assistance during the works.”

- James Callan, Estimating Manager, Complex Co Pty Ltd -

“Our experience, in working with a Citygreen Design Studio was second to none. We found responses from the design studio to be very timely, and technically thorough. We went backwards and forwards a number of times, looking at different iterations of the design and, nothing was too much trouble to examine and explore different possibilities. I would highly recommend the Citygreen Design Studio to any future client considering using your services.”

- Sandra Smith, Principal Landscape Architect, City Of Monash -

“We are big on compliance on all projects, and the fact that their SmartCertify cloud platform covers all bases, and supports their 20 year warranties, is critical – especially that these pits are being installed under roadways and footpaths.”

- Johny Purkaystha, Civil Program Engineer, Central Coast Council -

"I reviewed all the previous projects that we have installed in the past couple years using your product and I can happily report back that we have 0% mortality in the soil cells, which is incredible!"

- Brendan Wilton, CEO, Trim Landscaping, Bedford, Canada -