Plants of Euphorbia pulcherrima Willd.‘Glory’ received seven biweekly 236.5-ml soil drenches, each containing either 0, 10, 40, 80,160, or 320 mg Mo/liter (0, 2.4, 9.5, 18.9, 37.8, and 75.7 mg/pot). No visible phytotoxic effects due to excess Mo were observed on any plants, and no treatment differences were evident for plant height at anthesis, days from start of short days to anthesis, or display bract diameter at anthesis. Foliar nutrient analyses indicated no effect on nutrient uptake due to treatment for any element except Mo. A level of 806 mg Mo/kg dry weight were recorded for poinsettia leaves without adverse effects on plant growth or appearance. Results suggest Mo toxicity is not a real threat in poinsettia production.
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Hammer et al. (1987) studied this question.