Photo by Melody

PlantFiles: Gentian
Gentiana 'True Blue'

Family: Gentianaceae (jen-shun-AY-see-ee) (Info)
Genus: Gentiana (jen-shee-AN-uh) (Info)
Cultivar: True Blue
Additional cultivar information: (PP20433)
Hybridized by Probst; Year of Registration or Introduction: 2008

5 vendors have this plant for sale.

8 members have or want this plant for trade.


24-36 in. (60-90 cm)

15-18 in. (38-45 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)

Sun Exposure:
Full Sun
Sun to Partial Shade


Bloom Color:
Medium Blue

Bloom Time:
Mid Summer
Late Summer/Early Fall


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

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
By dividing the rootball

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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Thumbnail #1 of Gentiana  by Epiguy

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Thumbnail #2 of Gentiana  by Epiguy

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Thumbnail #3 of Gentiana  by Epiguy

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Thumbnail #7 of Gentiana  by DaylilySLP

There are a total of 13 photos.
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Gardeners' Notes:

Neutral coriaceous On May 5, 2014, coriaceous from ROSLINDALE, MA wrote:

Upright, 15-20" tall. True blue flowers from late July into September. Moist well-drained soil in full sun to part shade.

Planted mine late last spring. It only produced a couple of flowers, and many of the stems blackened. I suspect it's in too much shade.

A cross between a G. scabra hybrid and a G. makinoi hybrid.

Hardy Z3-9.


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

Durango, Colorado
Old Saybrook, Connecticut
Belchertown, Massachusetts
Hubbardston, Massachusetts
Sandwich, Massachusetts
Walterville, Oregon
Wynnewood, Pennsylvania
Canyon Lake, Texas

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