Melilotus altissimus, commonly known as tall yellow sweetclover or golden melilot, is a biennial or short-lived perennial herb native to Eurasia and North Africa, typically found in open areas such as fields, roadsides, and waste places. It has been introduced to North America and other regions where it can become invasive. This species can reach a height of 3-8 feet (1-2.5 meters) and has a spread of 2-3 feet (0.6-0.9 meters). The plant features trifoliate leaves and small, fragrant yellow flowers that bloom in elongated clusters from late spring to late summer, providing a long flowering season. The flowers are highly attractive to bees and other pollinators.

Tall yellow sweetclover is valued for its nitrogen-fixing ability, which can improve soil fertility, and its deep root system that helps prevent soil erosion. It is often used in agriculture as a green manure crop and forage for livestock. In gardens, it can be used in wildflower meadows or as a temporary filler. It thrives in full sun and is tolerant of a wide range of soil types, including those with poor fertility, but prefers well-drained soils. While generally low-maintenance, it can self-seed prolifically and may require management to prevent unwanted spread.CC BY-SA 4.0