You have a yucca 'tip' that's grown 1.5 meters in 18 months. You can cut it back to your desired height (but not all the way to the soil). Typically, 3–4 new heads will form from the cut stump. No special assistance is needed—just ensure adequate light and water.
Yuccas become tall and gangly without sufficient light. Provide 6–8 hours of direct sunlight daily. If yours is growing too fast and stretching, it's likely light-starved.
— Tom
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