Yucca roots are tenacious. No selective herbicide kills yucca without risking nearby plants. Roundup (glyphosate) will kill everything it touches.
Relentlessly remove every green shoot before it reaches a few inches tall. This starves the root system. It may take a year or more. Every root fragment can resprout.
Temporarily remove other plants, apply Roundup to yucca regrowth, wait a year, then replant. But this is extreme.
Persistence is the only non-chemical solution.
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