What types of trees have roots that grow down, rather than out?
I will be replacing a retaining wall in the near future. The current one, made of cinder block, is bowing as there was a lilac bush that was there for years before we moved in, and the roots made it bow out. So, that will go and a modular block wall will go in to replace it.
I want to put in a nice shrub/tree to anchor the planting bed which will be held back by the wall. The area gets full sun, especially in the afternoon. I was thinking of a Crape Myrtle or an Emerald Green Arborvite.
Thanks for any help!