Which of the following plants is known for its strong fragrance and use in ornamental gardens?

Salvia is known for its strong fragrance, which makes it a popular choice in ornamental gardens. This genus of flowering plants primarily includes species that produce vibrant flowers and aromatic foliage. The scent often attracts pollinators, such as bees and butterflies, enhancing the garden's ecological value while also providing a delightful sensory experience for gardeners and visitors alike.

In ornamental gardens, Salvia varieties are cultivated not only for their aroma but also for their diverse colors and adaptability to various growing conditions. They tend to be drought-tolerant, making them suitable for a range of environments, including borders and containers.

In contrast, while the other plants listed may have their own unique qualities, they are not particularly noted for strong fragrances. Coleus is primarily valued for its colorful foliage, Impatiens are favored for their shade tolerance and abundant blooms, and Bacopa is appreciated for its delicate flowers and cascading habit—all lacking the strong scent characteristic of many Salvia species. This underscores the distinct role Salvia plays in ornamental horticulture, particularly concerning fragrance.