When does torhleaf goldeneye bloom in California?

Most often in June. Across 324 dated, research-grade observations of Bahiopsis laciniata in California, the flowering season runs roughly January to December.

Peak June In flower 324 Examined 358 State California

Flowering 324 in flower of 358 examined

80%

92%

94%

92%

95%

90%

77%

75%

79%

92%

80%

Proportion of examined Bahiopsis laciniata in California in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	16	20	80%	58% to 92%
Feb	23	25	92%	75% to 98%
Mar	49	52	94%	84% to 98%
Apr	82	87	94%	87% to 98%
May	49	53	92%	82% to 97%
Jun	37	39	95%	83% to 99%
Jul	18	20	90%	70% to 97%
Aug	10	13	77%	50% to 92%
Sep	9	12	75%	47% to 91%
Oct	11	14	79%	52% to 92%
Nov	12	13	92%	67% to 99%
Dec	8	10	80%	49% to 94%

Peak flowering in Jun. Each bar is the share of Bahiopsis laciniata 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. 324 of 358 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 laciniata 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 laciniata

torhleaf 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.