Neva,
Corn meal to to feed micros that help deter bad fungi that cause disease, and that is why I add it, very good to control black spot on roses as well. I would not use corn gluten meal on any beds you start from seed in, as it has about a 90 day residual that would also prevent your seeds from surviving. I do use cgm on my lawn and it works real well.
The two products sound very similar, but are used for vastly differnet reasons.
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