Phytoremediation of Heavy Metals

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Mugwort (Artemisia vulgaris)

Us city slickers have fouled the sandboxes we play in. Find an open field in a big city like Los Angeles or New York and the odds are that it’s a former toxic waste dump. Here in our neighborhood we’ve got a lot of lead and zinc–lead from paint and gasoline and zinc from brake linings.

These heavy metals don’t magically go away. They are elements, and short of an alchemical transformation you have to physically remove them, cover them up, or apply phosphate so that plants don’t take them up as readily.

One promising strategy is phytoremediation, the use of plants to uptake heavy metals. City Atlas youarethecity, in New York, is experimenting with Indian mustard, mugwort, basket willow and sunflowers to remediate a contaminated garden. The results are promising with some metals down 50% in a year. Mugwort (Artimesia vulgaris) did an especially good job with a wide range of contaminants.

I should note that Garm Wallace, who runs Wallace Labs, a soil testing service, says that phytoremediation can take many years to get heavy metals down to a safe level. That being said, breeding plants specifically for heavy metal hyperaccumulation is a technology that could make up for our past transgressions.

Thanks to Michael Tortorello for the tip.

How to Search for Science-Based Gardening Advice

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Agricola’s search page.

In the course of writing our books and this blog we’ve had to deal with a lot of thorny gardening questions such as the effectiveness of double digging, the toxicity of persimmons, compost tea, lasagna gardening and how to mulch to name just a few. While the internet is an amazing tool, the number of conflicting commercial interests, biases and crazy talk in the eGardening world can make it difficult to, as Mark Twain put it, “corral the truth.” And I have to confess to promulgating some of the questionable advice that’s out there.

In the interest of not spreading more bad information Linda Chalker-Scott, Extension Horticulturist and Associate Professor at Washington State University, did a webinar (archived online here) with a lot of great advice on how you can evaluate gardening advice as well as do your own searches of peer reviewed literature.

Continue reading…

Saturday Linkages: Rammed Earth, Vanilla Ice and Moonshine

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Best idea of the week. Image: Natural Building Blog

Smokeless Rammed Earth Stove http://feedly.com/e/3e4xRBr8 

Ice Goes Amish: http://modernfarmer.com/2014/02/vanilla-ice-amish-farmer/ …

Plastic debris for brains http://www.honeybeesuite.com/plastic-debris-for-brains/ …

RiYL podcast 041: Colin Spoelman, moonshine maker: http://boingboing.net/2014/02/20/riyl-podcast-041-colin-spoelm.html …

Brazil’s new dietary guidelines: food-based! http://feedly.com/e/xL8TJUJf 

Austrian Designer Upcycles Bike Parts into Faux Hunting Trophy Bicycle Mounts http://inhabitat.com/austrian-design-upcycles-bike-parts-into-faux-hunting-trophy-bicycle-mounts/ …

How Would You Drive If Your Child Was Crossing the Street in Front of You? http://feedly.com/e/6MzdiI4- 

Meet the Miller: Nan Kohler http://feedly.com/e/oWHthiZg 

Meet the Baker: Dave Miller http://www.farine-mc.com/2014/02/meet-baker-dave-miller.html?spref=tw …

Flower Mandalas: http://boingboing.net/2014/02/17/flower-mandalas.html …

Fallout shelter originally installed in 1955 for a family of three in Fort Wayne, Indiana. http://feedly.com/e/1vhqFO23 

For these links and more, follow Root Simple on Twitter:

Village Homes: A Model for Sustainable Suburbs

I’ve recently discovered a truly inspiring housing development in Davis, California. This is not new news–it was built in the 1980’s, but it’s new to me and worth sharing.

Village Homes is the brainchild of architect/developer Michael Corbett. It encompasses 70 acres and 200-some homes. It has all the space and privacy that brings people to the suburbs, but it’s designed with considerable intelligence. For instance, the homes are all designed according to passive solar principles, so their heating and cooling bills are considerably reduced. Some have even have green roofs. But more interesting is the landscaping, the massive network of bike/walking paths and the creative use of public space.

The entire development is essentially a big food forest. All of the rainfall is captured and instead of being directed to the sewer system, it runs to swales between the houses, to nourish fruit trees. The resulting space is a lush park full of edibles, from exotic jujubee trees to grapes to almonds. Residents can stroll around in the abundant shade and pick fruit at will. Only the almond crop is off limits–the almond crop is harvested every year and sold to support the the gardening services for the entire development. There are also community garden space available for those who wish to raise more food crops than their own yard space allows.  The lush growth coupled with the reduced asphalt surfaces makes the whole development 10 degrees Farhenhiet cooler in the summer than the surrounding suburbs.

I could go on and on, but perhaps the best way to get a feel for it is to watch the 10 minute video above. It’s hosted by Permaculture guru Bill Mollison, who’s a big fan of the development.  It’s well worth the time to watch it all the way through.

Also, here’s a short paper on the development, which gives all the pertinent facts, friendly for quick skimming: Village Homes: A model solar community proves its worth.

And finally, here is a video someone took during a site tour given by Michael Corbett, the developer. It doesn’t have as many visuals as Mollison’s video, but has some good insider tidbits in it, as well as discussion of some of the other features of the development, like office rental space and day care.