New Guide to CU Structural Soil®

Cover of CU Soil guideRecently, the Cornell Urban Horticulture Institute, headed by Nina Bassuk, published a 57-page Comprehensive Guide to CU-Structural Soil.

This is THE publication to share with your municipality’s engineers and leadership, to show the why and how of CU-Structural Soil.

CU-Structural Soil®, also known as CU-Soil®, is a two-part system comprised of a rigid stone “lattice” that meets engineering requirements for a load-bearing paving base, and a quantity of uncompacted soil that supports tree root growth.

The first section of the Guide discusses the role of soil volume and how to calculate how much soil volume a tree needs.  No matter how well matched your tree species is to its site, limited soil volume is something few trees can abide, much less thrive in.

CU schematic
CU-Soil conceptual diagram

The Guide goes on to give the case for CU-Structural Soil  in particular, and answers FAQs like “How much CU-Soil will I need?”, “How do you plant trees in CU-Soil?”, “Can it be retrofitted for use under existing trees?”, and “How is irrigation and drainage handled?” It also explains how to obtain CU-Soil that meets quality control specifications. (This, by the way, is why CU-Soil is licensed—to ensure quality control. Otherwise, anyone could mix up rocks and soil and claim to be selling “CU-Soil.”)

Read more…