The unique blue flower adds to the charm of this plant. In favorable sites the plant can be invasive spreading by seeds.
Pronunciation
(sen-tah-REE-ah)(mon-TA-na)
Plant Type
All Plants, Perennials Hardy
Hardiness Zone
3-8
Sunlight
full, mostly sunny, partial sun
Moisture
average
Soil & Site
tolerates most soils but prefers one with a higher ph
Temperature
grows best in cooler regions.
Flowers
main color is blue but there are white, pink and amethyst cultivars available, flower is botanically a ray flower, outside long ray petal, florets are tubular and the ends are divided into segments, at the base of the flower each over lapping bract is tinged black
Roots
tap root
Maintenance
Dead heading to lateral buds can prolong bloom. Cut back to basal foliage after blooming.
Propagation
seeds, division
Native Site
Species plant native to Europe
Misc Facts
Reported to be an invasive plant spreading by seeds. I have never come across this plant in area where it was considered invasive.
Notes & Reference
#04-Herbaceous Perennial Plants (Allan Armitage), #54-The Well Tended Garden (DiSabato-Aust)