Plants, especially vine-like plants and flowering plants
such as roses, wisteria, etc. may be "trained" to assume
order as specific shapes. This is different than topiary
in which plants are trimmed to assume a shape such as a
vase, animal, pyramid, etc. Plants trained to assume a
shape are espaliered.
Espaliered plants can be made to grow along "avenues" in
gardens, especially avenues of straight lines or circles.
These espaliered avenues may be where dances take place.
Renaissance gardens often had "pergolas" (or paths
with plant-bowers trained to grow on a trellis as
espaliered plants).