Filling in The Bald Spots

Yesterday we bought and planted a few perennials to fill in some bald spots. There’s no rhyme or reason to our garden. We really don’t pay attention to plant colors, heights etc… See a plant we like we find a bare spot and put it in the ground. Very minimal soil preparation also. Only the hardiest of plants survive here.
Above is a yellow Coneflower by the name of “Big Sky Harvest Moon”. Below are Bee Balm “Grand Marshal” and “Gardenview Scarlet” and Dianthus “Floral Lace Perl”.