Watch your ponytail palm carefully to know the proper time to repot the plant. When you notice some swelling in the trunk at the base, just above the soil line, it is time to relocate the ponytail palm to a larger pot.
Mist the soil around the palm with water until it is just moistened. Slide one hand beneath the bottom of a smaller pot, or turn a larger pot carefully on its side and wrap the fingers of your other hand around the trunk. Tap the bottom of the pot gently and then wiggle it until you feel the root system loosen.
Slide the ponytail palm completely from the pot and set the container aside. While holding the palm in place, trim each visible root to no more than 2 inches long using sharp hand-held pruning shears.
Pass a pronged hand cultivator over the entire root ball to loosen the system. Trim any newly-revealed roots that are longer than 2 inches, and remove any damaged or poorly-formed roots at their base. Repot your ponytail palm as desired.