Salvia sylvestris and Salvia nemorosa are both popular perennial plants, but there are some notable differences between the two species. As a retired horticulture professor with a passion for perennials, I can shed some light on these distinctions.
One key difference lies in their reproductive abilities. Salvia x sylvestris is a sterile hybrid, meaning it cannot produce viable seeds. This implies that if you want to propagate this particular species, you cannot rely on seed propagation. On the other hand, Salvia nemorosa is mostly seed propagated, meaning it can be easily grown from seed. This makes it a more accessible option for gardeners looking to expand their collection or share the plant with others.
Another difference worth noting is their growth habits. Salvia sylvestris tends to have a more upright and bushy growth habit, with sturdy stems that can reach heights of 2 to 3 feet. Its foliage is usually gray-green in color, providing a lovely backdrop for its vibrant flowers. In contrast, Salvia nemorosa generally has a more compact and clump-forming growth habit, with shorter stems ranging from 1 to 2 feet in height. The leaves of S. nemorosa are often narrower and darker green compared to S. sylvestris.
When it comes to flower characteristics, both species display beautiful blooms, but there are subtle differences. Salvia sylvestris typically produces larger flowers, often in shades of blue, purple, or white. The flowers are arranged in whorls along the upper portion of the stems, creating a striking display. On the other hand, Salvia nemorosa tends to have smaller, densely packed flowers in a wider range of colors, including shades of pink, purple, and blue. These flowers also form in whorls but are more compact and create a more delicate overall appearance.
In terms of hardiness and adaptability, both Salvia sylvestris and Salvia nemorosa are generally easy to grow and can tolerate a range of conditions. They are both considered to be drought-tolerant once established and attract pollinators such as bees and butterflies. It’s worth mentioning that while S. sylvestris is known to be more heat-tolerant, S. nemorosa tends to be more cold-hardy and can withstand harsher winters.
In my own experience, I have found both species to be delightful additions to any garden. Salvia sylvestris, with its upright growth habit and showy flowers, makes a fantastic focal point in borders or mixed perennial beds. On the other hand, Salvia nemorosa’s compact form and long-lasting blooms are perfect for edging, rock gardens, or even container plantings.
While Salvia sylvestris and Salvia nemorosa share similarities as perennial plants, there are distinct differences between them. S. x sylvestris is sterile and cannot be raised from seed, while S. nemorosa is predominantly seed propagated. They differ in growth habit, flower characteristics, and hardiness, offering gardeners a range of options when choosing which Salvia species to incorporate into their landscapes.
