permaculture

[lbsaltzman@aol.com]

I read the article and will stay in the camp of being conservative and not 
using railroad timbers.  This paragraph bothers me.
 
Some organic gardening publications have claimed that these garden uses are 
unsafe. The U.S. Environmental Protection Agency has approved the use of 
CCA-treated wood for gardens. (Tests have confirmed that arsenic does not 
leach from timbers used in gardens. Soil was collected from near timbers that 
had been place from 6 months to 9 years.)
 
I wouldn't currently trust anything out of the EPA under the current 
administration, without reading the underlying scientific studies they are 
based on and determining whether those studies are unbiased or funded by 
industry.

-----Original Message-----
From: Marimike6@cs.com
To: permaculture@lists.ibiblio.org
Sent: Mon, 23 Apr 2007 6:26 AM
Subject: Re: [permaculture] Railroad ties and gardens


Is it safe to build raised-bed gardens from creosoted railroad ties?

Creosote is the kind of thing that sounds scary in principle-- it leaches 
into the soil, it's contains carcinogens, etc. But as a practical matter, it 
does 
not appear to me to pose grave problems for either gardener or plants... if 
you are to believe the very reasonable sounding explanation found here:

http://www.metrokc.gov/health/hazard/treatedwood.htm

Are treated railroad ties guaranteed 100% innocuous? I don't think anyone 
would say that. So it's a matter for each individual to decide. When building 
such a bed, maybe you could minimize skin contact by wearing gloves. And be 
tidy 

when loading and unloading your truck. Maybe you could wear a face mask, it 
can be stinky work.

The alternative would be to use more easily rotted landscaping timbers that 
needed replacing every several years. Maybe you could make one bed from each 
material, and compare them under actual conditions to see which you found 
prefereable.

Check your untreated landscaping timbers for wood boring insects. They hasten 
the conversion of your raised bed into a mound of garden soil.

Don't like either approach? Here's a good third opinion-- cinder blocks. They 
don't mention that inches from the blocks your soil pH will be elevated. So I 
wouldn't use them near your rhododendrons or forest cultivars.

http://www.organicgardening.com/feature/0,7518,s1-5-19-717,00.html

Michael   
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