We have a retaining wall made out of railroad ties- Can I put trees in it?

Question

It is 87' long, 5' deep, and 4' wide. Can I put trees (small) or other suggestions on plants?

Answer 1

You should be able to put trees in the area you've described.  Although, I'd check on the root systems of the trees before I bought them.  You wouldn't want a tree with large root systems that would eventually grow out between your railroad ties.  We just got rid of our railroad ties and now have a stone wall.

Answer 2

Awesome! Small is right, how about dwarf fruit trees? The roots aren't usually invasive and you get the bonuses of great flowers and fruit.