I agree with the others that the trees won't survive. We could all be wrong, though. In my experience, white pine grows fast once it takes hold. As I drive the tractor out to my mill, I generally will spot a "new top" at least once a year. This is in the U.P. of Michigan. They grow fast as far as height goes, but the diameter takes a long time to get established. I see a lot of 30 ft. tall trees which are only 4 inches or so in diameter at breast height. These are growing in the woods, so they grow straight and tall, reaching for the sun. In the open, they'll usually branch out fast and make poor timber.