Gentiana Species, Closed Gentian, Bottle Gentian, Gall Flower, Sampson's Snakeroot
Gentianaandrewsii

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

Synonym:Cuttera catesbei

Synonym:Dasystephana andrewsii

Synonym:Pneumonanthe andrewsii

Category
Perennials

Water Requirements
Average Water Needs; Water regularly; do not overwater

Sun Exposure
Sun to Partial Shade

Foliage
Deciduous

Foliage Color

Height
12-18 in. (30-45 cm)

Spacing
6-9 in. (15-22 cm)

Hardiness
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)

Where to Grow

Danger

Bloom Color
Dark Blue
Blue-Violet
Medium Purple

Bloom Characteristics

Bloom Size

Bloom Time
Late Summer/Early Fall

Other details

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
Non-patented

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