Super Green Thumb
Posts: 2097
Joined: Fri Jul 25, 2008 7:27 pm
Location: Mid Ohio

I would be careful about spreading large amounts of borax or boric acid roach powder on the grade or compost. Boron is a trace nutrient, but in higher concentrations is toxic to plants. The roaches have to go some place during the day so that would be the place to spread the stuff.

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