Urban dirt can have higher-than-healthy concentrations of lead, arsenic and other toxic metals that accumulate over time. Soil testing -- whether for pH, salinity or heavy metals -- can be a good idea for anyone who intends to grow edibles or who simply wants to give any type of plant a good start.
We sent our soil samples to two laboratories: Wallace Laboratories ($65 per test) in El Segundo, (310) 615-0116, www.bettersoils.com
; and EarthCo ($20 to $100 per test) in St. Louis, (314) 994-2167, www.drgoodearth.com
You can learn more about heavy-metal content in garden products by visiting the Assn. of American Plant Food Control Officials' website, www.aapfco.org/metals.htm
-- Susan Carpenter
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