Closed Gentian
Gentiana andrewsii
Last reviewed: June 2026
Light
part shade
Water
medium
Size
12"–36" H × 6"–12" W
Bloom
Aug, Sep, Oct
Native to
CO, CT, IA, IL and 18 more states
Pollinators
bees, butterflies
Closed gentian produces distinctive deep blue bottle-shaped flowers that never fully open, creating an unusual and eye-catching display in late summer and fall. This native perennial thrives in partial shade with consistent moisture and forms neat clumps that work well in both formal and naturalistic garden settings.
In an HOA neighborhood
Closed Gentian is an HOA-friendly choice. Maintenance level: low. Tidiness: 3 out of 5.
Works well in: front yard, foundation, mid zone.
- May appear bare in early spring before emergence
Wildlife value
The unique closed flowers are specifically adapted for pollination by bumblebees, which are strong enough to force their way inside. This plant provides crucial late-season nectar when few other native flowers are blooming.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does Closed Gentian fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.