We have sago palms in pots that are 4 to 5 years old. When we transplanted to larger pots about 2 years ago, we noticed the roots were 'coiled' and quite long. After putting them in larger pots to allow for more growth, they seemed to do very well. This year they have not grown as in the past, and I suspect the roots have continued to coil and they are probably root bound and packed. Can you cut the root to allow for more growth in pots?