Commonly called Evening Primrose.

Oenothera Siskiyou is a compact and floriferous perennial that's noted for its controlled growing habit and large, prolific wine-cup blooms in pale pink. Blooms open in the evening and remain open until morning, hence the name 'evening primrose.' They are especially drought tolerant, making them a good choice for sunny dry areas or rock gardens. 

Plant in fill sun and expect blooms beginning in May and lasting through June.

Arrives to you in a gallon-sized pot.