Ticker, you're absolutely right about how Roundup works, or rather, doesn't work in the soil. I remember reading Lorn's comment, and thinking the same thing, but didn't have time to respond right then, and then forgot about it. There should be no adverse reaction with lilies or any plant, if no above ground parts are exposed to the chemical. Nevertheless (and as you note, Ticker), that doesn't mean that Roundup goes <poof!> and disappears in the soil. The chemical is still there, along with its accompanying surfactants, etc., until they naturally biodegrade.
One must always use any chemicals, natural or man-made, with judicious caution.
