The plants

Creeping Phloxnative cultivar

Phlox subulata 'Emerald Blue'

···█▃·······   Blooms Apr–May

Black Chokeberrynative cultivar

Aronia melanocarpa 'Low Scape Mound'

····█·······   Blooms May

Coral Bellsnative cultivar

Heuchera americana 'Green Spice'

····▃█▃·····   Blooms May–Jul

Virginia Sweetspirenative cultivar

Itea virginica 'Little Henry'

····▃█······   Blooms May–Jun

Wood's Purple Asternative cultivar

Symphyotrichum 'Wood's Purple'

·······▃█▃··   Blooms Aug–Oct