Designing with Soils

The Dirt

sugar-beach
“Growing plants is the goal,” said James Urban, FASLA, Urban Trees + Soils, at the 2013 ASLA Annual Meeting in Boston. To grow healthy plants, one needs healthy soils, and landscape architects who understand soils and know how to call a soil scientist. In a wide-ranging talk, Urban and his co-presenter, soil scientist Norm Hummel, discussed how landscape architects can design with new soils the right way, particularly in challenging, damaged urban landscapes.

Whether natural or man-mixed, soils have physical, environmental, and chemical properties. These are all important to the health of a growing medium. Physical properties include organic matter, water, drainage, and aeration. Environmental characteristics include light and temperature. Chemical elements include the pH balance, and the presence (or not) of phosphorous, nitrogen, and potassium, which are all critical elements for plants.

To determine what kind of soil is needed for a project, Urban said goals and requirements…

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