Achillea filipendulina
Zones: 3 to 9
Size: Up to 4-ft. high and 3-ft. wide
Prefers: Full sun
Flowers: Mid to late summer

Hydrangea arborescens 'Incrediball'
Zones: 3 to 9
Size: Up to 5-ft. high and 5-ft. wide
Prefers: Partial shade
Flowers: June to August

Astilbe X arendsii 'Fanal'
Zones: 4 to 8
Size: Up to 30 inches tall and 18 inches wide
Prefers: Full sun /Partial shade
Flowers: Early Summer

Agastache sp.
ones: 6 to 10
Size: Up to 48 inches tall and 36 inches wide
Prefers: Full sun 
Flowers: Summer

Echinacea 'Secret Affair'
Zones: 4 to 9
Size: Up to 24 inches tall and 24 inches wide
Prefers: Full sun /Partial shade
Flowers: Mid Summer

Amsonia hubrichtii
Zones: 5 to 8
Size: Up to 36 inches tall and 36 inches wide
Prefers: Full sun /Partial shade
Flowers: Spring

Artemisia 'Powis Castle'
Zones: 6 to 9
Size: Up to 36 inches tall and 24 inches wide
Prefers: Full sun
 

Hydrangea quercifolia
Zones: 5 to 9
Size: Up to 8 feet tall and 8 feet wide
Prefers: Full sun /Partial shade
Flowers: Summer

Hemerocallis 'Always Afternoon'
Zones: 3 to 9
Size: Up to 24 inches tall and 24 inches wide
Prefers: Full sun /Partial shade
Flowers: Summer

Adianyum venustum
Zones: 4 to 8
Size: Up to 6 inches tall and 24 inches wide
Prefers: Full sun /Partial shade
 

Sedum rupestre 'Angelina'
Zones: 3 to 11
Size: Up to 6 inches tall and 36 inches wide
Prefers: Full sun
Flowers: Summer

Artemisia 'Powis Castle'
Zones: 6 to 9
Size: Up to 36 inches tall and 24 inches wide
Prefers: Full sun