Arbor Day is Friday April 26. There are so many great picture books to get kids learning about trees. And these books can also be used to discuss Earth Day, which is April 22. Check out this great list of books about trees.
https://youtu.be/u8vDnOOeccI?si=fGmp9fc52Cn5wltg
Little Tree by Loren Long
https://www.amazon.com/Little-Tree-Loren-Long/dp/0399163972/