Good morning. Planning on adding/replacing some edge/border plants on our perennial cutting garden. Since they are in front I am thinking height of max 12". Prefer something that would bloom most of the summer VS early spring, but if early bloomer. then would like something with nice foliage and good habit after blooming. Looking to replace salvia. Nice early bloom, but flops open and not much interest after it blooms. Looking for any suggestions. Thanks Brian