When does Parish's goldeneye bloom in California?

Most often in May. Across 1,555 dated, research-grade observations of Bahiopsis parishii in California, the flowering season runs roughly March to November.

Peak May In flower 1,555 Examined 1,846 State California

Flowering 1,555 in flower of 1,846 examined

68%

74%

89%

93%

94%

82%

77%

83%

87%

74%

Proportion of examined Bahiopsis parishii in California in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	113	166	68%	61% to 75%
Feb	163	221	74%	68% to 79%
Mar	297	334	89%	85% to 92%
Apr	279	300	93%	90% to 95%
May	120	128	94%	88% to 97%
Jun	9	11	82%	52% to 95%
Jul	10	13	77%	50% to 92%
Aug	10	12	83%	55% to 95%
Sep	59	68	87%	77% to 93%
Oct	216	247	87%	83% to 91%
Nov	151	174	87%	81% to 91%
Dec	128	172	74%	67% to 80%

Peak flowering in May. Each bar is the share of Bahiopsis parishii in California observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 1,555 of 1,846 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.wt38fd.

What this is, and what it is not

This is a record of when people in California found Bahiopsis parishii in flower, not a forecast. It is computed only from observations made in California, so it is not the species’ global average dragged onto a map: the same plant flowers on different dates in different places, and that is the entire point of the page.

It will not tell you what your particular plant will do this year. Bloom time moves with the season, with altitude, and with the weather, and a warm February pulls everything forward. We publish the distribution and the sample size, and we refuse to draw a month that too few people examined.

The plant

Bahiopsis parishii

Parish's goldeneye

Sourcesevery claim on this page

GBIF (iNaturalist Research-grade Observations). Dated flowering annotations in California. Every record achieved iNaturalist quality grade Research, which is applied upstream at export. 10.15468/dl.wt38fd. Retrieved 2026-07-14.
World Flora Online Plant List. The accepted name. CC0. Retrieved 2026-07-12.