some late season blue flowering plants to try.

Gentiana cruciata :

This gentian grows in drier soils than most others, doing well in rocky areas.  It is native from eastern European.  The leaves are lance shaped and have a leathery texture with medium green color. The flowers are located in clusters at the end of the stems and they arise from axillary bracts along the stems, they are bell shaped and sky to dark blue in color. Blooming from midsummer to fall.
Plants grow 8-15 inches tall and ten inches wide
Use in full sun in a rock garden or at the front of a boarder.  Zones 3-8. 

Gentiana andrewsii :

"Willow Gentian" GENTIANACEAE
plants grow 12-36 inches tall and have arching habit.  They bloom in late summer and early fall with nice solid Blue flowers that are shaped like a bottle. Best in well drained soils that are moisture retentive. Use in full sun to light shade around brushwood and grassy or open treed locations. they are called willow gentian because the leaves are shaped like willows with the same smooth texture. Nice plants for the rock garden or front of the boarder, in the wild they are found in central and southern Europe in mountains above 1000 meters altitude and in grassy to semi wooded locations. Zones (4) 5-9 Sow outdoors in the fall or use 4 weeks at 68ºF then 4-6 months at 21ºF (below freezing), move to 53ºF for germination.  Surface sow seeds, light needed for best results. Strong light has been know to over come the needed cold period.
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