Answer: Weed killers can be non-selective, killing everything they touch. It sounds like that is what has happened to your plant. If it was just drift or overspray, the roots of the plant may still be okay. If the plant was covered in weed killer it probably will die all the way down to the roots. In this case there's really no hope. You might want to take a wait and see attitude - perhaps it will show new green growth. If so you can just cut back all the dead brown stuff. Good luck with your plant!
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