When does Schott's dalea bloom in California?

Most often in April. Across 1,196 dated, research-grade observations of Psorodendron schottii in California, the flowering season runs roughly April.

Peak April In flower 1,196 Examined 2,789 State California

Flowering 1,196 in flower of 2,789 examined

18%

25%

64%

84%

62%

26%

24%

50%

45%

39%

Proportion of examined Psorodendron schottii in California in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	99	561	18%	15% to 21%
Feb	139	563	25%	21% to 28%
Mar	299	470	64%	59% to 68%
Apr	314	374	84%	80% to 87%
May	77	124	62%	53% to 70%
Jun	6	23	26%	13% to 46%
Jul	0	11	0%	0% to 26%
Aug	1	19	5%	1% to 25%
Sep	20	84	24%	16% to 34%
Oct	61	121	50%	42% to 59%
Nov	66	148	45%	37% to 53%
Dec	114	291	39%	34% to 45%

Peak flowering in Apr. Each bar is the share of Psorodendron schottii 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. 1,196 of 2,789 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 Psorodendron schottii 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

Psorodendron schottii

Schott's dalea

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.