You don't encourage yucca to bloom. They only bloom when they're ready to. Yuccas bloom inconsistently. It is hard to say how often it will bloom because of this. You can try giving it a phosphorus rich fertilizer or add bone meal to the soil to help with blooming, but there are no guarantees. This article should offer some clues as well: https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plant-doesnt-bloom.htm
Answered on July 16, 2015
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