Ask-a-Dave's-Gardener: Pony tail palm needs help!, 2 by tlhawaii

tlhawaii wrote:
Can someone please tell me what\'s wrong with this pony tail palm? I raised it from a small 3\" plant to what is now 10 times that big, but it has begun every once in awhile getting really white in the center instead of its usual green. I thought maybe it needed nutrients so I fed it with a commercial plant food and I water it once a week. It is in full sun in the morning, but by noonish, the sun goes around the building so it has all the light it needs, but not the heat too much. Any suggestions?