I very much doubt this. Lobelia is a very popular garden plant in England. If Tolkien had been worried about the toxicity of plants as an indicator of character he wouldn't have called his hero's remarkable mothet after the truly lethal Belladonna aka deadly nightshade. A more likely link would be to the Victorian language of flowers in which Lobelia represents malevolence.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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