Answer: It may be that the yucca in your yard is growing in soil that is too rich. If a plant is overfertilized, it is less likely to bloom. If you think about the yucca's native arid, desert environment, you'll see what I mean. You may need to transplant it to a drier, less fertile soil, or put it in a pot so you can control the nutrient supply. Perhaps a root pruning, acheived by slicing through part of the root system with a spade, will persuade it to bloom, as this will also cut down on nutrient uptake.
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