Re: Thanks for sharing your never ending uninformed poorly written opinion, yet again.
These are necessary elements required by plants: Major Nutrients: Nitrogen (N), Phosphorus (P), and Potassium (K)
Secondary Nutrients: Calcium (Ca), Magnesium (Mg), and Sulfur (S)
Micronutrients or Trace Elements: Boron (B), Chlorine (CI), Copper (Cu), Iron (Fe), Manganese (Mn), Molybdenum (Mo), and Zinc (Zn)
Notice Boron is on the list.
Boron is not a heave metal, it is a semimetal.
Boron is not worse than lead.