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.

Definitions of fastigiate
  1. adjective
    having clusters of erect branches (often appearing to form a single column)
    erect, upright, vertical
    upright in position or posture
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