To stand under the rose means to stand privately or confidentially, which is what he did when he bid the mason farewell.
Context: He had risen from the bench to bid the mason farewell, and now he stood privately and confidentially under the rose trellis, which had lately come into bloom.
Hypothesis: He had risen from the bench to bid the mason farewell, and now he stood under the rose trellis, which had lately come into bloom.

Is the hypothesis incorrect? (Yes, no, or unknown)?