When does southern bush monkeyflower bloom in California?

Most often in June. Across 1,065 dated, research-grade observations of Diplacus longiflorus in California, the flowering season runs roughly January to October.

Peak June In flower 1,065 Examined 1,116 State California

Flowering 1,065 in flower of 1,116 examined

88%

75%

95%

99%

97%

94%

73%

80%

55%

63%

Proportion of examined Diplacus longiflorus in California in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	21	24	88%	69% to 96%
Feb	36	48	75%	61% to 85%
Mar	146	154	95%	90% to 97%
Apr	303	307	99%	97% to 99%
May	277	279	99%	97% to 100%
Jun	160	161	99%	97% to 100%
Jul	68	70	97%	90% to 99%
Aug	17	18	94%	74% to 99%
Sep	11	15	73%	48% to 89%
Oct	8	10	80%	49% to 94%
Nov	6	11	55%	28% to 79%
Dec	12	19	63%	41% to 81%

Peak flowering in Jun. Each bar is the share of Diplacus longiflorus 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. 1,065 of 1,116 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 Diplacus longiflorus 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

Diplacus longiflorus

southern bush monkeyflower

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.