Re: Plants for toxic areas

On Mon, 27 Jan 1997, Maddy Harland wrote: 

> There is a site in Britain which uses willow biomass to harvest acidic
toxin s from a cider factory. Bull rushes are also known to take up heavy
metals and other toxins but with all plants, the metals are stored in the
biomass and cannot be consumed. Maddy>

What do you mean stored in the biomass? And do you mean should not be 
eaten or do you mean consumed by the plant cells?  Please explain.  Thanks