The genus Salvia (Sage) contains some of our most beautiful ornamental flowers. And Salvia species are found on every continent, save Australia and Antarctica. Naturally, with such a huge range worldwide, their variability is immense and they provide us gardeners with a wealth of choices for our gardens.
Gardening in a USDA zone 6 climate, I like to divide the cold hardy Salvia into two primary groups; the US natives and the Old World varieties found in Europe and western Asia. From these two groups, we have an outstanding range of plant types and flower colors.
The Old World Salvia include some of the very best, most durable, longest-lived perennials. The hybrid nemerosa-types flower in numerous shades of blue and pink. They include ‘May Night’, ‘Caradonna’, dwarf ‘Marcus’, Lyrical Rose European Sage and the gorgeous ‘Blue Hill’. The syslvestris hybrids do especially well in heavy clay soils, yet grow with ease in all but the most sandy of soils.
Then there are all the Salvia species native to North America. It is from the Western US that we find our most beautiful native species. But the challenging aspect for some of these native Salvia has been to find cold hardy ones that can be grown north of their native desert haunts. This has been an area of keen interest for me and I have been working for many years breeding and selecting for beauty and cold hardiness. Salvia greggii ‘Furman’s Red’ and Salvia greggii ‘Cold Hardy Pink’ are top picks. Salvia hybrids between S. greggii and other Salvia species from Texas, New Mexico and Arizona have resulted in some outstanding selections such as ‘Maraschino’, ‘Raspberry Delight’, ‘Ultra Violet’ and ‘Burgundy Seduction’.
I heartily recommend planting Salvia pachyphylla and Salvia dorrii in arid western gardens. These two evergreen species are native to California and the Great Basin of UT, OR and NV. Not widely known outside of the native plant gardening community, these two species are especially nice with their silver leaves and showy blue/purple flowers. But they are not for planting in areas that get more than 12 to 16 inches of annual precipitation. They are true Westerners.
Two other species of Salvia that have proven themselves to be outstanding early fall bloomers with excellent cold hardiness are Salvia azurea and Salvia reptans Autumn Sapphire . These two blue-flowered species stand out in the fall garden with their finely textured foliage. I’ve found that the hummingbirds eagerly seek out these two, in spite of not having brightly colored pink, red or orange flowers that hummers generally prefer.