Phlox Growing Zones

USDA Zones 2 and 3

• Phlox subulata, known as moss phlox or creeping phlox, comes in multiple cultivars tolerant of very cold conditions, such as those common in USDA zones 2 and 3. "Fort Hill" grows no higher than 6 inches, creating a carpet-like mat of vegetation suitable for ground cover on hillsides and in rocky locations. Fort Hill produces pink flowers in full sun sites, with alkaline soils supporting its growth. "White Delight" is a similar cultivar, with the exception of its white flowers. Perennial Resource recommends employing White Delight to "tone down" areas with more brilliant colors.

USDA Zone 4 and 5

• Phlox divaricata "Fuller's White" is a white flowering form of wild sweet William, a phlox appropriate for USDA zones 4 and 5. Fuller's White grows between 9 and 12 inches, blooms for a month during April or May and generates creamy, white flowers with five petals. Fuller's White serves in native plant gardens and in the front of your perennial borders. Plant Phlox glaberrima "Morris Berd" in your cottage gardens. This smooth phlox cultivar grows to 24 inches and its flowers, blooming during April or May, are purple and very fragrant.

USDA Zone 6 and 7

• "The King" is a form of tall garden phlox (Phlox paniculata), also called fall phlox, with royal purple flowers. The King grows well in USDA zones 6 and 7, maturing to between 24 and 36 inches high. The King is fit for formal gardens, as well as butterfly and hummingbird gardens. The King blooms during the middle of summer to early fall. "David's Lavender" is a garden phlox variety producing lavender shaded flowers from July into September. David's Lavender grows to 4 feet high, and the perennial is a fine addition to the rear of garden borders.

USDA Zone 8 and 9

• With its origins in the region of the Mississippi Delta,"Delta Snow" handles heat associated with USDA zones 8 and 9. This garden phlox features a pure white flower, with the centers possessing a splash of purple. Delta Snow grows as small as 24 inches or to heights of 4 feet; it serves as a cut flower for arrangements. Rock gardens are suitable settings for using a creeping phlox called "Millstream Daphne." It withstands zone 8 and 9 conditions, growing to form 6-inch-tall carpets of pink flowers in early spring.