When does Catclaw Acacia bloom in California?

Most often in May. Across 294 dated, research-grade observations of Senegalia greggii in California, the flowering season runs roughly May to June.

Peak May In flower 294 Examined 1,456 State California

Flowering 294 in flower of 1,456 examined

31%

65%

54%

22%

15%

18%

10%

Proportion of examined Senegalia greggii in California in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	11	168	7%	4% to 11%
Feb	6	130	5%	2% to 10%
Mar	8	131	6%	3% to 12%
Apr	49	158	31%	24% to 39%
May	89	136	65%	57% to 73%
Jun	53	99	54%	44% to 63%
Jul	10	46	22%	12% to 36%
Aug	1	52	2%	0% to 10%
Sep	6	80	8%	3% to 15%
Oct	23	150	15%	10% to 22%
Nov	16	87	18%	12% to 28%
Dec	22	219	10%	7% to 15%

Peak flowering in May. Each bar is the share of Senegalia greggii 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. 294 of 1,456 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 Senegalia greggii 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

Senegalia greggii

Catclaw Acacia

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.