Hardiness Zones / 2
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 2 is between -50°F and -40°F or -45.6°C and -40°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).
One of the tallest, Ageratum houstonianum 'Blue Horizon' (Floss Flower) features fluffy round clusters of lavender to purplish-blue flowers resembling asters.
Exotic-looking, award-winning Amaranthus cruentus 'Velvet Curtains' is a vigorous annual or biennial plant with erect, dark crimson plumes and stunning, ovate, red colored foliage. It enjoys an upright, bushy habit and helps create dramatic mixed borders. Great for the back of the border or as a filler, its long-lasting flower spikes make excellent cut flowers that are prized by florists for their beauty.
Named after the Greek goddess of love, Amaryllis, 'Aphrodite' (Hippeastrum) is a graceful beauty with its huge, white, double flowers, up to 8 in. across (20 cm), delicately brushed with blush-pink on the petal tips and adorned with blood-red thin margins.
Bringing instant glamour to your home, Amaryllis 'Magic Green' (Hippeastrum) is quite amazing with its huge, pale green and ivory flowers adorned with beautiful crimson markings. A dwarf flowering Amaryllis of choice with its softly colored, tropical-looking blossoms that will help take the gray chill out of the dead of winter!
A compact serviceberry, Amelanchier alnifolia 'Regent' is an ornamental shrub or small tree which provides multi-season interest. In early spring, before the leaves appear, it produces masses of showy and slightly fragrant white flowers held in upright clusters.
Adding a delicate airiness to borders or fresh bouquets, Ammi majus (Queen Anne's Lace) is an upright, hardy annual with large domed umbels, densely packed with pristine white flowers. Borne on tall, branched, slender stems, the lacy blossoms mingle gracefully with the other plants in the border.
dding a delicate airiness to borders or fresh bouquets, Ammi visnaga (Toothpick Weed) is a lovely hardy annual or biennial plant with large domed umbels, up to 5 in. across (12 cm), of densely packed white flowers which mingle gracefully with the other plants in the border. The finely divided foliage is attractive and acts as a light but effective filler, making this plant one of the best filler foliage plants.