Hardiness Zones / 4
Based on the minimum ten-year average winter temperatures, plant hardiness zones maps have been progressively developed, first by the Department of Agriculture (USDA) for the United States and then more or less applied to the rest of the planet. The purpose of these hardiness zones is to identify how well plants will withstand the cold winter temperatures of these zones. The USDA Hardiness Zone Map divides North America into 13 zones of 10°F each, ranging from -60°F (-51°C) to 70°F (21°C). The range of minimum average temperatures for zone 4 is between -30°F and -20°F or -34.4°C and -28.9°C. If you are planning to buy a shrub, perennial or tree, you need to make sure that this new plant will tolerate year-round conditions in your area. Therefore, to ensure your new acquisition will survive and grow year after year, you will need to compare the hardiness zone of your area with the hardiness zone of your plant (included in most American references books, nursery catalogs and gardening magazines describing plants).
Regarded as the bluest of all conifers, Abies concolor 'Candicans' is a magnificent large evergreen conifer. Forming a dense pyramid when young, it matures to a columnar, highly symmetrical shape with handsome layered branches smothered by long, silvery-blue needles.
A deservedly popular White Fir, Abies concolor 'Compacta' is a slow-growing dwarf evergreen conifer of great beauty. It forms a dense, compact mound of irregular, spreading shape, unless it is sheared to a conical form. Its branches are beautifully clothed with long and slender, powder-blue needles
Stately and elegant, Abies nordmaniana 'Golden Spreader' is a slow-growing evergreen conifer of great beauty, particularly in the winter garden. While this dwarf Nordman fir sports a soft green color in summer and fall, its needles turn bright golden-yellow in winter.
Noted for its exfoliating bark and showy fall color, award-winning Acer griseum (Paperbark Maple) is a small spreading deciduous tree that is highly desirable. The chestnut-brown bark on both its trunk and branches constantly peels into thin tight curls, revealing brighter cinnamon-red wood beneath.
From deep rose to creamy pink! Good-looking, compact, bushy and heat loving, Achillea millefolium 'Pink Grapefruit' is a stunning Yarrow with its masses of long-lasting clusters of bright deep rose flowers fading delicately to creamy pink as they age.
Achillea millefolium 'Strawberry Seduction' is a stunning Yarrow with its masses of long-lasting clusters of rich velvety red flowers with bright gold centers. Its pleasantly aromatic, green fern-like foliage is disease resistant and nicely compliments the cheerful flat umbel flowers.
With a soft palette of pastel colored flowers, Achillea millefolium 'Summer Pastels' is a stunning Yarrow with masses of long-lasting flower clusters, up to 8 in. wide (20 cm), in glorious shades of red, pink, yellow, orange, salmon, lilac, purple and white.