Closed Gentian, Bottle Gentian, Gall Flower, Sampson's Snakeroot

Gentiana andrewsii

Family: Gentianaceae (jen-shun-AY-see-ee) (Info)
Genus: Gentiana (jen-shee-AN-uh) (Info)
Species: andrewsii (an-DROO-see-eye) (Info)



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


12-18 in. (30-45 cm)


6-9 in. (15-22 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)

Sun Exposure:

Sun to Partial Shade


Unknown - Tell us

Bloom Color:

Medium Blue



Bloom Time:

Late Summer/Early Fall



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:

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

Properly cleaned, seed can be successfully stored


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

Jewett City, Connecticut

Saint Charles, Illinois

Waukegan, Illinois

Oakland, Maryland

Shelburne Falls, Massachusetts

Worcester, Massachusetts

Bay City, Michigan (2 reports)

Midland, Michigan

Saint Paul, Minnesota

Joplin, Missouri

Saint Louis, Missouri

Munsonville, New Hampshire

Panama, New York

Van Etten, New York

Lake Toxaway, North Carolina

Mount Airy, North Carolina

Pittsburgh, Pennsylvania

Whitehall, Pennsylvania

Wynnewood, Pennsylvania

Leesburg, Virginia

Appleton, Wisconsin

Muscoda, Wisconsin

Wild Rose, Wisconsin

show all

Gardeners' Notes:


On Oct 2, 2013, LeslieMc wrote:

I have just purchased a few of these and intended to pot them up to overwinter indoors or on the deck, but the seller was adamant that they have to either go straight into the garden or to refrigerate them until I can plant them. I didn't really want to set them in the garden, though, because we may be moving in a few months, in the dead of winter or early spring. So my question is, is there any way I can pot them up to overwinter either indoors, outdoors, or in our enclosed, unheated garage, or must I, indeed, refrigerate them or get them into the garden asap? These are bare root plants. Zone 7b Virginia. Thank you.


On Dec 3, 2009, mosswitch from Joplin, MO wrote:

I ordered this plant several years ago as Gentiana septemfida but as it grew and began to bloom, I discovered that it was instead andrewsii. It seems to be a slow grower as it took about 10 years before it really filled out, but it is now a beautiful, multiple stemmed plant that produces dozens of blooms. I have it planted in my southwest Missouri garden in zone 6b, in light shade in ordinary garden soil under serviceberry, with hostas and violets. It might have been a more aggressive grower in more moist soil. I do try to remember to give it extra water during the hot days of July and August but it is very forgiving and blooms well anyway.


On Sep 8, 2005, tootsie from Bay City, MI (Zone 5a) wrote:

I originally found this plant growing under a grove of pine trees. I dug it up and transplanted it into my sun garden. I was surprized to see that it came up last yr. I also found some of the white ones growing in some thick brush next to my pond this summer! It appears to be a hardy plant.