Have 2 Emerald Queen Norway Maples in my backyard that I planted about 6 years ago and they are not growing much, if at all. In fact, they haven't grown that much since they've been planted. I figured it would take a couple years for them to get established but this long? I did see some growth season before last but nothing this year. Put fertilizer stakes around both last year. They look healthy. They were planted in burlap. I remember cutting burlap but maybe I didn't cut enough. But I would think burlap should be gone/disolved by now.

Why would this be? Any suggestions?