Blue Paradise Garden Phlox

Phlox paniculata 'Blue Paradise'

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The flowers on this garden phlox open light blue, deepen to violet-blue, and look bluer in morning and evening light than at midday. Phlox paniculata 'Blue Paradise' grows 2 to 3 feet tall and 1 to 2 feet wide in full sun, hardy from Zone 4 through Zone 8, and reaches full size in its second or third summer.

Blue Paradise is strongly fragrant and starts flowering in early July. Its mildew tolerance is good where air moves freely around the plant.

Garden phlox, Phlox paniculata, grows wild across the eastern and central United States along stream banks, in open woods and in damp meadows, and gardeners grew it long before anyone bred a series of it. Each flower is a narrow tube with nectar at the base, built for long tongues, so swallowtails, fritillaries, hummingbird moths and hummingbirds visit through midsummer. The plant dies to the ground in winter and comes back from the roots a little wider each year. Even mildew-resistant phlox stay cleanest with space between plants and air moving freely through the stems.

The color shift shows best where the plant is seen in morning or evening light, near a patio or a window.

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Size at Maturity

Height 2'- 3' Spread 1'- 2'

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Growing Zone

USDA Hardiness Zones 4-8

Lowest Temperatures -30°F to -20°F

Light Requirements

Full sun - more than 6 hours of direct sun per day

Wildlife Benefits

  • Supports Bees
  • Attracts Butterflies
  • Attracts Hummingbirds

Native Range

AL, AR, DC, DE, GA, IA, IL, IN, KS, KY, LA, MD, MI, MN, MO, MS, NC, NE, NJ, NY, OH, OK, PA, SC, TN, UT, VA, VT, WA, WI, WV

Special Conditions

Fragrant

Seasons of Interest

  • Summer

Planting and Care Guide

Planting Tips

Plant in moist, well-drained soil. Space 18–24 inches apart. Water thoroughly after planting and mulch lightly. Good air circulation is important for mildew prevention.

Care Tips

Water deeply once a week in dry spells, about an inch at a time, at the base of the plant and in the morning so the leaves dry quickly.
Space plants 18 to 30 inches apart depending on mature width, and keep neighbors from crowding the stems. Moving air is the best defense against powdery mildew.
On tall garden phlox, thin each plant to its strongest 4 to 6 stems in late spring, when shoots are 6 to 8 inches tall. This opens the plant to air and gives larger flower heads.
Mulch lightly to hold moisture, keeping it a few inches back from the crown.
Feed once in spring with compost or a balanced slow-release fertilizer. Extra nitrogen makes soft growth that mildews more easily.
Remove spent flower heads to bring on side shoots and a second round of bloom, and to stop self-seeding. Seedlings do not come true to the parent.
Mildew that shows up in late summer is mostly cosmetic. Cut off the worst leaves and give the plant more room next year.
Spider mites can appear in hot, dry weather; regular watering keeps them down.
Cut stems to the ground after frost or in early spring.
Divide every 3 to 4 years in spring, when the center of the plant thins out.
Deer and rabbits browse phlox; protect new growth where they are a problem.

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