I'm going to plant two pecan trees. When I plant them, they'll just be pretty small, but will have an ultimate width of between 75 and 100 feet years from now.
Due to flooding issues, I would like to raise them up 8-12", and to prevent dirt from being washed away, I intend to essentially make an wooden raised bed, 2 1/2 ft square, 8-12" tall, and plant the tree on the top of that.
I'm hoping the root system as it grows will grow down and then spread out, but I wanted to double check that the roots won't be damaged by the constraints of the wooden raised bed.
Worse comes to worse, I can just unscrew and remove the raised bed after three years or so, but my question has to do with me leaving the raised bed boards permently in place.
Can I plant a tree in a open-bottomed raised bed, even if it's from a larger tree species?