Single module for flower, plant or tree root protection. Use when planting to prevent roots from encroaching into unwanted areas such as under patios.andnbsp;The modules allow for high-quality root structure to grow in a healthy and controlled environment.andnbsp;Can be used to prevent roots from growing up through pavements or causing dips and cracks. While the open matrix of the module provides a maximum growth zone for roots with more than 95% of the internal void volume is available for you to fill with nutrient-rich un-compacted soil. The failure to install a protection system such as Terravault could result in the surface becoming over compacted and rutted resulting in not enough oxygen and nutrients getting to the roots.Please Note - this module comes with completely open sides and ends - meaning the root can grow freely in all directions (apart from upwards). If you wish to block off certain areas as you areandnbsp;installing next to a patio or wall then Rainsmart Ellipse block