When does Mexican holdback bloom in Texas?

Most often in August. Across 153 dated, research-grade observations of Erythrostemon mexicanus in Texas, the flowering season runs roughly March to November.

Peak August In flower 153 Examined 183 State Texas

Flowering 153 in flower of 183 examined

78%

67%

95%

81%

87%

83%

100%

93%

71%

100%

67%

Proportion of examined Erythrostemon mexicanus in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	7	9	78%	45% to 94%
Feb	14	21	67%	45% to 83%
Mar	38	40	95%	84% to 99%
Apr	30	37	81%	66% to 91%
May	13	15	87%	62% to 96%
Jun	5	6	83%	44% to 97%
Jul	3	4	too few examined
Aug	9	9	100%	70% to 100%
Sep	13	14	93%	69% to 99%
Oct	5	7	71%	36% to 92%
Nov	6	6	100%	61% to 100%
Dec	10	15	67%	42% to 85%

Peak flowering in Aug. Each bar is the share of Erythrostemon mexicanus in Texas 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. 153 of 183 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 Texas found Erythrostemon mexicanus in flower, not a forecast. It is computed only from observations made in Texas, 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

Erythrostemon mexicanus

Mexican holdback

Sourcesevery claim on this page

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