PORTLAND (AP) — The Maine Department of Agriculture, Conservation and Forestry is advising residents who send Christmas trees and wreaths out of state to be aware of mailing regulations.

State horticulturist Ann Gibbs says many states closely monitor the shipment of plants to prevent the spread of plant diseases and invasive insects. The regulations can vary by state. Gibbs says plants should also be clearly labeled with the words “Grown in Maine” followed by the plants’ county of origin and the name and address of the person sending it.

The Maine agriculture department’s website includes an informational sheet about state regulations that apply when shipping wreaths and trees.