What was done
Having a good working relationship going back over ten years, Bath-based landscape architects MacGregor Smith had no hesitation in specifying Green-tech’s lightweight intensive topsoil and subsoil for all the planting beds in the sunken garden.
For the tree pits at ground level, the decision was taken to use Green-tech’s Green-tree Amenity Tree Soil; a fertile, load bearing structural tree soil from Green-tech, specifically developed to BS3882:2015 for use in the urban environment. Having a naturally open structure, Green-tree Amenity Tree Soil allows for compaction without sacrificing any water percolation or aeration properties of the soil.
To finish off the tree pits, MacGregor Smith specified the Fortress tree grille tray. This is designed to accept block paving to ensure a seamless transition to the surrounding paved finish. Each pit included an irrigation pipe topped with Green-tech’s Mono Relief Piazza aluminium filler cap, which was set flush into the paving.
To ensure that the tree ferns in the sunken garden received adequate irrigation, the decision was made to fit a fully automated Rain Bird irrigation system, also from Green-tech. The system was custom designed for the area and featured micro-sprays and drip-lines, along with the all-important pressure regulators and solenoids. The pressure regulators are critical to any automated system, as they ensure that each emitter or drip line provides the same amount of water no matter how far down the line from the water source they are.
Images: MacGregor Smith