When does Sweetbush bloom in Arizona?

Most often in August. Across 138 dated, research-grade observations of Bebbia juncea in Arizona, the flowering season runs roughly January to December.

Peak August In flower 138 Examined 167 State Arizona

Flowering 138 in flower of 167 examined

83%

88%

50%

87%

86%

50%

100%

90%

88%

75%

96%

Proportion of examined Bebbia juncea in Arizona in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	5	6	83%	44% to 97%
Feb	7	8	88%	53% to 98%
Mar	5	10	50%	24% to 76%
Apr	27	31	87%	71% to 95%
May	12	14	86%	60% to 96%
Jun	2	4	too few examined
Jul	3	6	50%	19% to 81%
Aug	9	9	100%	70% to 100%
Sep	9	10	90%	60% to 98%
Oct	15	17	88%	66% to 97%
Nov	21	28	75%	57% to 87%
Dec	23	24	96%	80% to 99%

Peak flowering in Aug. Each bar is the share of Bebbia juncea in Arizona 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. 138 of 167 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. One month has fewer than 5 examined observations, so no proportion is drawn for it. 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 Arizona found Bebbia juncea in flower, not a forecast. It is computed only from observations made in Arizona, 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

Bebbia juncea

Sweetbush

Sourcesevery claim on this page

GBIF (iNaturalist Research-grade Observations). Dated flowering annotations in Arizona. 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.