Dune evening primrose in Anza-Borrego

Oenothera deltoides

Dune evening primrose usually blooms from mid-December to early April in Anza-Borrego, with the best color from early March into late March.

mid-December – early April Best: early March into late March Out of season

The show usually starts around mid-December. Check back closer to the season.

Based on reports from iNaturalist naturalists. 1,821 flowering reports from Anza-Borrego Desert State Park shape this curve. The shaded band marks the best weeks; the dashed line is this week.

Where to see them

Big white paper flowers that open toward evening and slump by mid-morning — go early. They grow right in the sand with the verbena.

Anza-Borrego Desert State Park

We name public reserves, parks, and roads only — never exact pins, never private land.

Nearby on the calendar

Desert gold in Anza-Borrego — best early March into late March
Desert sand verbena in Anza-Borrego — best late February into late March
Desert lilies in Anza-Borrego — best late February into mid-March

Updated August 14, 2026. Bloom timing varies with the year's weather — the curve shows the usual rhythm, and in-season updates sharpen it.