These high altitude work horses flower 8-16 weeks with minimal care. All are drought-tolerant, much-loved by hummingbirds and butterflies.
![](http://4.bp.blogspot.com/_Ha_cQO3YwFc/Ri-qDMtaygI/AAAAAAAAAaA/Hu-N5zuvrKQ/s320/Geranium_Johnsons_Blue.jpg)
Geranium himalayense x pratense
Flowers: May - September
Full Sun
USDA zones 4-8
![](http://1.bp.blogspot.com/_Ha_cQO3YwFc/Ri-qJctayhI/AAAAAAAAAaI/iF0P1dbjUks/s320/redbirds.jpg)
Scrophularia macrantha
Flowers: June - September
Happiest at 6,000 feet or higher
Full to part sun, shield from wind
USDA zones 5-10
![](http://4.bp.blogspot.com/_Ha_cQO3YwFc/Ri-qPMtayiI/AAAAAAAAAaQ/Ki-riQ9Byew/s320/Catmint.jpg)
Nepeta x faaseenii 'Select Blue'
Flowers: June - August
Full to part sun
USDA zones 4-9
![](http://2.bp.blogspot.com/_Ha_cQO3YwFc/Ri-qVstayjI/AAAAAAAAAaY/7JQ3olqZJCw/s320/jupitersbeard.jpg)
Centranthus Ruber
Flowers: June - August, with deadheading
Full to part sun
USDA zones 4-9
![](http://3.bp.blogspot.com/_Ha_cQO3YwFc/Ri_E_8taylI/AAAAAAAAAao/BpTXPoUCWJs/s320/allium.jpg)
Allium senescens 'Blue Twister'
Flowers: June - September, with deadheading
Full to part sun/Loves clay soil
USDA zones 3-8
* Tip: Some of the most spectacular perennials bloom for very short lengths of time. Plant them among these long-flowering varieties for continuous color all summer long.
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