Q: Gladioli failed where lantana grew last year. How long does allelopathy persist?
Allelopathy (chemical plant interference) is poorly understood even for black walnut. Lantana is a noxious weed in Australia/India partly due to allelopathy. Fortunately, allelochemicals degrade quickly after plant death—likely a few months.
Your gladioli may have had a virus instead. Lantana can't survive Georgia winters to become kudzu-like.
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