Talk about big impact! 'Royal Candles' baptisia adds color to your garden from the moment it breaks dormancy in the spring when it shoots up dark purple stems clothed in bright green leaves! http://www.bhg.com/gardening/gardening-trends/new-perennials-for-2015/?socsrc=bhgpin050715baptisiaroyalcandles&page=10
Agastache 'Purple Haze' (Hyssop) -- This decidedly hardy Agastache brings a new color palette with its long racemes of smoky blue violet flowers that never seem to stop coming. It remains compact in a container with an early pinch and is in flower from July to frost. It has survived wet and dry, and warm and cold winters in Pennsylvania where it has been in the ground since Spring 2000. Hardiness beyond zone 6 is unknown.
Agastaches are good for just about every region, and red hyssop is an especially strong choice. This tough, drought-resistant perennial bears orange, red, or apricot blooms for a long period in summer.