This sense of "weeds" derives from Old English and Middle English traditions where the word broadly denoted clothing or dress, especially distinctive or ceremonial garb, rather than the modern botanical meaning of unwanted plants. In poetry, it frequently appears in the fixed phrase "widow's weeds" to evoke the somber, veiled black robes symbolizing grief and loss. The term carries emotional weight, linking personal mourning to broader themes of transience, widowhood, and the performative rituals of sorrow. Its archaic flavor lends a dignified, historical resonance to descriptions of emotional states, allowing poets to compress complex ideas of darkness, renewal, and societal custom into a single vivid image. Longfellow employs it metaphorically to describe the world shedding the "darkness" of night like a widow casting off her mourning clothes at dawn, beautifully merging natural cycles with human experience.

The word originates from Old English "wǣd" (garment or cloth), evolving through Middle English to retain its clothing sense long after the plant meaning became dominant in everyday speech by the 16th–17th centuries. It is closely related to phrases like "widow's weeds" or "weeds of woe," which were common in Renaissance and Romantic literature. Modern readers may initially misinterpret the term as vegetation, so context—especially proximity to words like "widowhood," "mourning," or "garb"—is essential for correct understanding. Related archaic clothing terms include "raiment," "attire," and "habit." Avoid using "weeds" in contemporary poetry for clothing unless deliberately archaizing the voice, as it can confuse readers unfamiliar with the older usage. This term exemplifies how archaic language in poetry can enrich emotional and visual layers while connecting contemporary readers to earlier literary traditions.