Going native with plants: A new-old direction for water conservation
Different species of native plants can help communities tackle issues with too much or too little water.
Native plants are emerging as the new heroes in a growing struggle to deal with climate change. In communities that consistently have too little water, drought-tolerant mesquite trees, buffalo grass, and colorful Texas red sage provide attractive landscaping that doesn't require watering. Native plants also come to the rescue in areas with the opposite problem – storms that dump heavy rainfall and overwhelm the infrastructure for dealing with storm water. There, plants such as marsh milkweed, cardinal flower, bloodroot, and great blue lobelia can soak up the excess before it can run off.Skip to next paragraph
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Native plants are trees, shrubs, and wildflowers that grow in a specific region where they have evolved over time, adapting to the prevalent environmental conditions. Because of this, they can conserve water resources more efficiently than nonnative plants, which are naturally adapted to other climates.
In Denver, where the water-conserving landscape movement known as xeriscaping was launched in 1981, one of the first efforts in the city's sustainability program saw the Mile High Youth Corps replanting large areas of lawn with flower beds of drought-tolerant native plants at Denver's City and County Building and in front of three area recreation centers.
These conservation gardens – and the many others that followed – are one part of Denver's sweeping environmental initiative called Greenprint Denver (www.greenprintdenver.org).
Before Greenprint, the city made decisions about infrastructure, purchasing, land use, transportation, and waste management based on their social and economic impacts. Now, says Beth Conover, director of Greenprint Denver, environmental effects are being considered as well. "Greenprint is an effort to make sustainability a core value and operating principle of everything we do."
The program's goals include conserving water, reducing greenhouse emissions, using renewable energy, reducing waste, promoting mass transit, and increasing the amount of "green" housing that's affordable.
"Greenprint Denver sets an action agenda for sustainable development," Mayor John Hickenlooper says. "Every agency of the city government has to pass through the filter of Greenprint." All agencies – from parks and recreation to waste management – must consider and follow policies and practices that encourage environmental health, economic opportunity, and smart growth strategies.
One of Mr. Hickenlooper's goals for Greenprint is to get more people and organizations involved. "If everyone plays a part, it's not as daunting a task," he notes.
One example of a growing collaboration will occur later this month. As a kickoff to the mayor's plan to plant 1 million trees over the next 20 years, at least 7,000 new trees will be planted between Earth Day (April 22) and Arbor Day (April 27). "More than 42 different municipalities and organizations are participating," Hickenlooper says. "Now it looks like we might plant 9,000 or 10,000 trees."
Denver's mayor is committed to conservation on the personal front, too. In addition to turning down the thermostat at home and driving an energy-efficient vehicle, he washes and reuses his plastic sandwich bags. "We also xeriscaped as much as possible," he adds.
Native plants ease storm-water runoff
In Kansas City, Mo., where rain often causes flooding, native plants are providing a creative solution to managing storm water. The 10,000 Rain Gardens project is a communitywide environmental initiative designed to improve the quality of water flowing into streams, rivers, and lakes. (See www.rainkc.com and www.kcmo.org/mayor.nsf/web/raingarden?opendocument.)
Rain gardens are strategically placed in low spots in the landscape and designed to catch and hold rainwater, preventing it from running off the site. (Runoff causes flooding and is also responsible for polluting waterways with fertilizers and pesticides.) When planted with water-loving native plants, a rain garden becomes a beautiful and functional landscape addition that captures water before it can cause problems.
Lynn Hinkle, the project manager, is working to rally the community to build 10,000 individual rain gardens over the next five years.