by bart » Sun 06 Feb 2005, 05:09:12
$this->bbcode_second_pass_quote('gg3', 'I') am highly sceptical of urban gardening for two major reasons. One is all the toxic crap in the soil. Two is the toxic crap in the air, some of which comes down when it rains. And as for gardening in used tires, what about the toxic nasties in the rubber that could leach into your soil? Better to stick to clay pots and re-used plastic containers. And grow stuff indoors if possible.
I usually agree or am enlightened by gg3, but here I disagree.
Urban gardening is widespread throughout the world and has a big contribution to make after Peak Oil. There's a whole literature on the subject -- still not as much information as the topic deserves.
Toxic substances in the soil are localized, due to particular causes such as chips of lead paint scraped from a building. If one has contaminated soil, remediation is possible, but a fast solution is to import enough soil so your garden is a foot or more deep. Also, you can make good soil through composting.
For a fascinating look at the possibilities, see "ABOVE-GROUND GARDENS BY DR. MARTIN L. PRICE & LAURA S. MEITZNE" (ECHO website) at
http://www.echotech.org/technical/techn ... ovegro.PDF . ECHO specialized in agricultural information for the 3rd World.
What especially intrigued me was a garden made with a matrix of aluminum soda cans:
$this->bbcode_second_pass_quote('', 'T')he Wick Garden consists of a piece of polyester cloth (the "wick") laid out on a flat area in the shape of the desired garden and a 5-gallon bucket waterer (see above) placed directly on the wick. Set the root balls (the roots and soil attached to plants in their starting containers) of transplants directly on the wick.
Finish the beds by filling in around the plants to a depth of 3-6" with some extremely airy material such as pine needles, pieces of coconut husk, or even cola cans. It is important that this material be something that will not become waterlogged. Leave a section of the cloth clear to hold the upside-down bucket. The wicking action of the cloth spreads water and nutrients to the roots, which grow above and below the surface of the cloth. Sometimes the cloth is first covered with a thin layer (0.5-1") of compost or potting soil. Best results are found with short or trailing vegetables and herbs, such as onions, radishes, lettuce and mint.
About toxic nasties in the air, I'm not sure what you're thinking of. I've heard of lead from car exhaust being a problem in gardens close to roadways, but I've never heard of any other problems with the air. Are you thinking of particulate matter?
I'm not sure why gg3 would put more faith in vegetables grown by a stranger in unknown conditions than in vegetables one grows oneself.
I'm not particularly worried about health problems from vegetables -- though I'd always wash them. I would be much more concerned about meat and dairy products. Or the health problems from long-term consumption of junk food.