To build the first phase of the Tree Mastery Billboard, you'll need 24 ingredients: eight each of Scaffolding, Masking Tapes and Wood Stains. You can either purchase these individually for one Farm Cash each, or can ask your friends to send them to you via individual requests.
As you upgrade the Tree Mastery Billboard, it will be able to hold more and more signs, up to the maximum of 500 signs. You can flat out purchase a billboard with a capacity of 500 signs for 318 Farm Cash, but it also looks like you'll be able to purchase additional billboards for coins after you compete this first option given to you when logging into the game.
What do you think of this new Tree Mastery Billboard? Sound off in the comments.