Northwest Georgia has mild winters and warm humid summers and the plants and flowers that grow there should be hardy. While Georgia has a range of USDA hardiness zones, northwest Georgia falls in Zone 7. Flowers and plants for that zone include many favorites of homeowners.
The Shasta daisy (Leucanthemum x superbum) is a good perennial for cut flower arrangements. It will grow 2 to 3 feet tall, with clump forming foliage. White ray flowers are 2- to 5-inches wide, and bloom from summer to fall. Strap-like dark green leaves will grow 8 to 12 inches long. Propagate Shasta daisy via division or seed with full sun or partial shade in a well drained non-acidic soil. It will be hardy throughout USDA Zones 5 through 9.
The cardinal flower (Lobelia cardinalis) is a good perennial to attract hummingbirds into the landscape. It grows 1 to 3 feet tall with a 1-foot wide base. Red tubular flowers are 1 to 2 inches long with purple-tinted elliptical leaves. Propagate the cardinal flower via seed and offshoots with full sun to partial shade conditions in moist soil. It will be hardy in USDA Hardiness Zones of 3 through 10.
The black-eyed Susan (Rudbeckia hirta) attracts butterflies to the garden and is used well in cut flower arrangements. It grows to 3 feet tall. Flowers are like daisies and colors depend on the cultivar. The hairy lance-shaped leaves are 2 to 3 inches long. Propagate black-eyed Susan via seed or division, and grow it in full sun or light shade conditions with regular watering. Hardiness zones for the black-eyed Susan are from Zone 3 through 10.
The common yarrow (Achillea millefolium) is a perennial that attracts butterflies and can be used in flower arrangements. It will grow 1 to 3 feet high. The flowers are 2 to 3 inches wide and the color depend on the cultivar. The leaves are gray-green and fragrant. Propagate yarrow via division or seed; grow it in well-drained soil and in full sun. It will be hardy in USDA Hardiness Zones 3 through 9.
The butterfly weed, Asclepias tuberosa, is a perennial that is easy to grow and drought tolerant. It will bring butterflies to the landscape as the name suggests. Butterfly weed grows 2 feet high with orange or red flowers. Propagate butterfly weed via division or seed. It will thrive in any soil in full sun or partial shade. It will be hardy when planted in USDA Zones 4 through 10.
The purple coneflower (Echinacea purpurea) is an easy to grow perennial that is fast growing. It attracts butterflies and is good in flower arrangements. It grows 3 feet high and 3 feet wide. The purple daisy-like flowers are 3 inches wide. The coarse dark green leaves are 3 to 8 inches long. Propagate via seed or division; grow purple coneflower in full sun or partial sun conditions. The purple coneflower is hardy from Zones 3 through 9.