Gentiana Species, Bottle Gentian, Closed Gentian
Gentianaclausa

Synonym:Gentiana andrewsii var. intermedia

Synonym:Pneumonanthe clausa

Category
Perennials

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

Sun Exposure
Sun to Partial Shade
Light Shade
Partial to Full Shade

Foliage
Herbaceous
Smooth

Foliage Color
Blue-Green

Height
24-36 in. (60-90 cm)

Spacing
15-18 in. (38-45 cm)

Hardiness
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)

Where to Grow

Danger

Bloom Color
Dark Blue
Medium Blue
Blue-Violet

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

Bloom Size

Bloom Time
Mid Fall
Late Fall/Early Winter

Other details

Soil pH requirements
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