My wife would like to have a circular garden bed made to conceal the well cap....the well cap would be at the rear of the bed.

In addition to some shrubs and perrenials, she was hoping to have a tree planted in the middle of the bed. She was planning to do an evergreen, like a blue spruce or some other type of christmas tree.

But I am a little worried about planting near the well......
especially since the christmas tree can get quite large over time.

Could the experts here please provide some guidance on planting a tree near a well? How close could we plant something without too much worry?