I am going to be planting Norway spruce along the east side of my property in a hay field. It is going to be 360' of Norway spruce. I am going to recycle an old fence line to create cages to protect the trees from deer and will keep the hay field mowed around them. But my questions is I am thinking about planting them 30' apart in two staggered rows. I was hoping by keeping them farther apart they will maintain more lower branches as they mature and I don't need it for a wind break so a little spacing will be alright. Is there any issue with planting them this far apart other than it will take longer to get the full effect of the privacy screen?