Really delta?

delta is charging me a separate fee for quantity, oversize, and overweight bags but they let you bring christmas trees as a checked item?

from their website;
Christmas Trees
Do you want to bring some holiday cheer to your destination? You can indeed bring your Christmas tree with you. We will accept cut Christmas trees as limited-release baggage on all flights within the United States, including flights to/from Hawaii. However, all Christmas trees will be subject to baggage allowance and baggage size restrictions, as well as some other rules:

• Trees need to be adequately packaged with the root ball or cut base and all branches wrapped and secured using a burlap-type material.
• If you are traveling into Hawaii and checking a Christmas tree as baggage, you must include it on your declaration form and the tree must pass agricultural inspection