Assertion: lemon balm's stem | /r/HasProperty | square
Facets:
Source sentences:
text: The stems tend to be square, and are covered with long spirals of petals on each one.
text: It has square stems and leaves are in an opposite branching pattern.
text: The branched upright stem is square and grows to about 3 feet in height.
text: The stem of Bee Balm is square, grooved and hard; and about 3 feet high.