Photo by Melody

PlantFiles: Garden Phlox
Phlox paniculata 'Blue Boy'

Family: Polemoniaceae (po-le-moh-nee-AY-see-ee) (Info)
Genus: Phlox (floks) (Info)
Species: paniculata (pan-ick-yoo-LAY-tuh) (Info)
Cultivar: Blue Boy

3 vendors have this plant for sale.

7 members have or want this plant for trade.


36-48 in. (90-120 cm)

24-36 in. (60-90 cm)

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


Bloom Color:

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Flowers are fragrant
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball
From herbaceous stem cuttings
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

Click thumbnail
to view:

By pirl
Thumbnail #1 of Phlox paniculata by pirl

By ArabellaMay
Thumbnail #2 of Phlox paniculata by ArabellaMay


No positives
2 neutrals
No negatives

Gardeners' Notes:

Neutral saya On Feb 15, 2014, saya from Heerlen
Netherlands (Zone 8b) wrote:

Phlox 'Blue Boy' is hybridized by B.H.B. Symons-Jeune and introduced in 1949.

Neutral weedsfree On Aug 7, 2012, weedsfree from Magna, UT (Zone 7a) wrote:

The plant I bought kept breaking at the slightest touch. Bits would even break off from wind. In my experience it is a brittle plant. The last time it broke, it was close to the soil surface. I don't think it will come back. It never got big enough to need staking either. About 6" tall. I think it would have been a very pretty plant to see to maturity.


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

Sacramento, California
Hazlehurst, Georgia
Niles, Illinois
Southold, New York
Concord, North Carolina
Bend, Oregon
Knoxville, Tennessee
Leesburg, Virginia

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