Gaura lindheimeri - Oenothera lindheimeri

Gaura lindheimeri
Willowy and graceful plant with an abundance of butterfly-like white tinged, pink flowers from late spring to early autumn. Height 150cm.
 
Oenothera lindheimeri 
White gaura
A bushy perennial with slender erect stems bearing small lance-shaped leaves and starry white or pink-tinged flowers in loose racemes in summer and autumn
 
Ultimate height
1–1.5 metres 
Time to ultimate height
2–5 years 
Ultimate spread
0.5–1 metres