I am 6b, and the site is south facing with a fair bit of direct sun. 63 feet wide. There is a thriving linden, at least 80 feet tall on one side of the garden ... quite a big wingspan. On the other side WAS an 80 ft pine (not sure what kind). It got blown down in a windstorm and looking to replace it. Because the linden is so dominant, thinking the slimmer profile of a pine might indeed be the best offset/choice ... but wondering if anyone has any other thoughts. Was evilly looking at a monkey puzzle tree but know that would die over the winter. Magnolia? Tulip tree? Too fat? Birch? Another pine? Thanks for any ideas.
This is too general. You need to list some specific characteristics you like, and some to avoid. Then candidates for your consideration can be proposed from which you would pick.