Ideas for 18 inch plants
I have two large sections which I want to plant 18" plants en masse. In my garden I have white (Iceberg roses and daisies), yellow/gold (heliopsis, black eyed susan), pink (coneflower), purple (agastache), plum (black lace elderberry), red (yarrow and beebalm) with zinnias (red)and orange (gallardia). Any ideas for a perennials to place up front? Right now I have Agastache which is supposed to be compact but is almost 4' right now blocking everything else. Thanks.