Answer: First off I apologize for the delay in answering your question. It may be that the soil is too wet; this plant really needs a well drained soil and a sign of overwatering would be yellowing lower leaves. Make sure the soil surface and digging into a bit with your finger is thoroughly dry before you water, then water deeply and wait until it is drying out before you water again. Other possible causes might be planting it too deeply, or using new soil that is a poor match to the old soil so they drain differently, or using a container without drain holes in the bottom. Also make sure the plant is receiving ample sunlight -- generally yuccas would be full sun plants. I hope this helps!
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