Solidago sempervirens, the seaside goldenrod or salt-marsh goldenrod, is a plant species in the genus Solidago of the family Asteraceae. It is native to eastern North America and parts of the Caribbean. It is an introduced species in the Great Lakes region. Similar plants found in the Azores(now Solidago azorica) are thought have evolved from a natural introduction of this species.
Solidago sempervirens is a succulent, herbaceous perennial that reaches heights of 4–6 feet (120–180 cm). It is unusual in the genus in having toothless, hair-less leaves, thicker than those of most other Solidago species. Flower heads are found in a large paniculiform inflorescence at the top of the plant, often with branches that bend backwards towards the base. This species blooms in late summer and well into the fall, later in the season than most of its relatives. Its fruits are wind-dispersed achenes. They are yellow often, and have sprouts of buds at the end of the short branches.