A tree or shrub that is fastigiate has branches that point up. Sometimes the upward sloping branches of a fastigiate tree could look like they’re part of a single column.
The word fastigiate comes from the world of botany. A tree that's fastigiate has branches that point up — they’re erect and almost parallel. This gives fastigiate trees a distinctive look, and some people like to plant them in the yard where they don’t have tons of space but want a tree. A Lombardy poplar and a kind of ginkgo biloba are fastigiate trees. Bushes or even branches can be described as fastigiate too.