original_query: What are the characteristics of the Mule Palm (× Butiagrus nabonnandii)?
query: What are the characteristics of the Mule Palm (× Butiagrus nabonnandii)?
answer: The Mule Palm is a man-made hybrid between the Butia palm and Queen palm. It is one of the hardiest feather palms, combining the hardiness of the Butia palm with the fast-growing, tropical fronds of the Queen palm. Mature specimens are rare due to the difficulty in producing them, and cold tolerance varies between specimens. Many resemble coconut palms.