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Smooth Phlox, Marsh Phlox 'Morris Berd'

Phlox glaberrima

Family: Polemoniaceae (po-le-moh-nee-AY-see-ee) (Info)
Genus: Phlox (floks) (Info)
Species: glaberrima (gla-ber-REE-muh) (Info)
Cultivar: Morris Berd



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Requires consistently moist soil; do not let dry out between waterings

Where to Grow:

Unknown - Tell us


12-18 in. (30-45 cm)

18-24 in. (45-60 cm)


24-36 in. (60-90 cm)


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:

Full Sun

Sun to Partial Shade



Bloom Color:


White/Near White

Bloom Time:

Mid Spring

Late Spring/Early Summer



Other details:

Unknown - Tell us

Soil pH requirements:

5.1 to 5.5 (strongly acidic)

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

Patent Information:


Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

From herbaceous stem cuttings

From seed; winter sow in vented containers, coldframe or unheated greenhouse

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Urbana, Illinois

Olathe, Kansas

Roslindale, Massachusetts

Saint Paul, Minnesota

Clover, South Carolina

Gardeners' Notes:


On Jun 2, 2014, coriaceous from ROSLINDALE, MA wrote:

Upright growing but short---not over 18". Looks like a dwarf garden phlox (P. paniculata) with narrower, shinier leaves. Tough, easy, and adaptable, requiring little care.

Does not get powdery mildew. More tolerant of heat and humidity than garden phlox (P. paniculata), and a better choice for the US southeast.

Blooms a month earlier than garden phlox (P. paniculata), at the beginning of June here (Boston, Z6a). Very long blooming.

Highly adaptable as to soil type and pH. Performs well in partial shade.

Space these 12-18" apart.

Most easily propagated by dividing the root ball in early spring. Stem cuttings can be rooted. Seeds can be sown, but may not come true to type.

According to Charles Oliver, ... read more


On Mar 22, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:

PHLOX glaberrima MORRIS BERD - Smooth Phlox-Short 12-15" - Plant 15" apart. Z 4-9. Very free and long blooming, 6-8 weeks in flower. A Carolina native who forms a dense mound of shiny mildew free foliage. Loves heat and humidity.
General Information:
Best selection for Gulf states: zones 8, 9, & 10