See:
Note: Domestic water that contains chlorine and/or fluoride is usually not harmful to poinsettias. Toxicity of fluoride at >0.4 ppm in the water results in necrotic spots on the tips and margins of young leaves and bracts.
See:
Note: Domestic water that contains chlorine and/or fluoride is usually not harmful to poinsettias. Toxicity of fluoride at >0.4 ppm in the water results in necrotic spots on the tips and margins of young leaves and bracts.