Subject: How does magnetism effect plant growth? The color?

I planted 12 plants and in half of the pots I put 2 magnets attracting 
each other on opposites sides of the pots.  I watered them all and 
they were all in equal amounts of sun light.  The end result was that 
the ones with the magnets had a longer stem and grew faster.  But the 
leaves curled up into themselves and changed colors a bit.  Can you 
please answer my questin above in junior high terms, if you can answer 
it at all.  Thank you very much.

Re: How does magnetism effect plant growth? The color?