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Concrete forming root control units.

GreenBlue Urban’s new RootForm is designed to be filled with concrete to form a high strength haunch around the tree.

Many benefits include leaving a perfect base for fixing down tree grilles and preventing compaction of the tree rooting area immediately adjacent to the root ball.

The simple, strong, click together sections are ready for concrete pour in moments and the sectional format means it is suitable for any size tree pit.

RootDirectors naturally encourage deep root growth improving stability and drought balance.


  • Prevents ‘root girdling’ – a fatal rooting pattern
  • Deeper root growth improves drought tolerance, tree stability and longevity
  • Guides roots away from areas vulnerable to de-icing salts
  • Prevents pavement ‘root heave’ effectively eliminating trip hazards
  • Assembled ready for concrete pour in moments


  • Modular construction for any sized tree pit
  • Recycled HDPE is resistant to puncture, biodegradation, and photodegradation
  • 400mm standard depth
  • Suitable for inclusion of steel reinforcement if required


Complete sets

Product CodeComponentsLengthDepthTree grille frame sizeComponents
RF4-12AComplete Set1200mm400mm1200mm square4x Corner, 4x 500
RF4-15AComplete Set1500mm400mm1500mm square4x Corner, 4x 300, 4x 500
RF4-18AComplete Set1800mm400mm1800mm square4x Corner, 8x 300, 4x 500

Individual components

Product CodeComponentsLengthDepthWeight
RF4-CRACorner section350mm400mm3.32kg
RF4-30AStraight section300mm400mm1.84kg
RF4-50AStraight section500mm400mm2.93kg

Concrete Volume

Product CodeConcrete Volume
RF4-CRA33.6 Litres
RF4-30A14 Litres
RF4-50A23.6 Litres
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