- Written by Robbi Hoy
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Helpful Tip from the Garden Geeks: There have been many questions about Japanese beetles, here is another trick that may help. Did you know that 4 o'clocks, jimsonweed (Datura stramonium), dwarf and red buckeyes, and delphiniums all attract and poison Japanese beetles? But be cautious, 4 o'clocks and jimsonweed are toxic to humans and pets as well.