es·pal·ier /ɪsˈpæljɚ/
樹牆,牆式樹木
Es·pal·ier n. Hort. A railing or trellis upon which fruit trees or shrubs are trained, as upon a wall; a tree or row of trees so trained.
And figs from standard and espalier join. --Pope.
Es·pal·ier, v. t. [imp. & p. p. Espaliered p. pr. & vb. n. Espaliering.] To form an espalier of, or to protect by an espalier.
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espalier
n : a trellis on which ornamental shrub or fruit tree is trained
to grow flat