Eldon - You will have to thin the salvias when they spread too much. One Black and Blue Salvia can become 20 the next summer and you get to enjoy them as is or pull up some and replant elsewhere in the yard.
My basic plants for my entire in-ground gardens here at the house and at Riverside are -
Black & Blue Salvia
Argentina Skies Salvia
Brazilian Sage "blue"
All except the Weigelas will spread providing you with many extra plants to share with other people. Weigelas can be started from cuttings.
David Verity Cupheas are also popular here at the house and you can get them to survive winters by cutting to the ground and covering with bags of mulch or leaves.