I have a group of birch trees, with a pine growing in the midst of them, in my front yard. My friend is telling me the pine must be cut down to save the birches. I see her concern, however: I think the entire arrangement is pretty; the pine looks healthy; I don't like to kill anything; and tree removal in Massachusetts is very expensive. I'd prefer to leave it alone, or, if anything, take down the birch directly to the right of the pine (see the third picture below), as it's leaning over the driveway.
This view is from the road.
This is a side view from the driveway.
The roots of the pine, on the left, are virtually tucked under the birch on the right,
and are also encroaching on another birch to the left.
Is cutting one of the trees down strongly recommended? If so, which?