The two most common mistakes are: the wrong tree and the wrong place for it. There are simply too many factors to consider when planting a tree in the city for it to be done effectively by a layperson.
Choosing a poor tree specimen from retail nursery tree stock is tremendously common. Most nurseries do not have an arborist on staff, so stock that an arborist knows to be poor regularly ends up at retail nurseries. This can lead to very costly maintenance and repairs that the homeowner might not become aware of until the tree is mature and it is too late. It may be that you spend 10 years growing a tree to maturity only to have it fail and need to be removed.
We recommend hiring an arborist to choose the tree from the nursery and plant it for you. We have a large stock of healthy tree stock handpicked by our arborists. The cost of a typical tree planting is outlined below. The price of the tree will vary depending on the size and variety chosen.