I have a 20 yr old, 6' high ponytail palm. Seven months ago I repotted to a larger comtiner. The leaves are still healthy, the root ball seems to be solid. As of this date, there has been no new growth. The plant recieves afternoon direct sunlight. Watering is one to two weeks, with soil being dry down to 1 to 1-1/2 inch. Afer 20yrs I would hate to loose the plant. Help/Help