Unley is currently reviewing quite an extensive list of trees that are listed as significant in our previous Development Plan and were transferred into the new code. Staff are currently reviewing this list and recommending for removal those that no longer exist. They also need you to nominate your favourite trees that are not on the list. To be significant the trunk must measure more that 3m at 1 metre above the ground or associated with a significant event. You can check which trees are already on this list here and you can nominate new trees as you identify them here. Why not put a post on Facebook of a picture of the tree you nominate every time you nominate a tree? Listing will add additional reasons for refusal and make removal almost impossible, even if it dies and doesn't present a danger.