I read somewhere that too much fertilizer can accumulate in leafy vegetables to
the point of being toxic for human consumption, does anyone know where I can
find out more about this, especially as it relates to hydroponics? I read this
in a book on green houses, it said something about problems with nitrogen not
being used up by the leafy vegetables in certain times of the year and thus
accumulating in the edible parts of the vegetable.

-Tony