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Re: How deep will a plant grow?

It would be an interesting experiment to get a light source down to 
about 15 to 20 meters and see what would grow.  Without much 
thinking, I envision a compact fluorescent in a lucite container made 
of inch-thick walls, weighted down with bricks and with a long, long, 
power cord.
Paul Krombholz in warm central Mississippi, where the spring peepers 
are peeping tonight.