When does Camphorweed bloom in Texas?

Most often in February. Across 446 dated, research-grade observations of Heterotheca subaxillaris in Texas, the flowering season runs roughly January to December.

Peak February In flower 446 Examined 488 State Texas

Flowering 446 in flower of 488 examined

93%

100%

88%

63%

69%

65%

74%

88%

92%

99%

98%

100%

Proportion of examined Heterotheca subaxillaris in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	26	28	93%	77% to 98%
Feb	19	19	100%	83% to 100%
Mar	14	16	88%	64% to 97%
Apr	17	27	63%	44% to 78%
May	9	13	69%	42% to 87%
Jun	11	17	65%	41% to 83%
Jul	14	19	74%	51% to 88%
Aug	35	40	88%	74% to 95%
Sep	60	65	92%	83% to 97%
Oct	116	117	99%	95% to 100%
Nov	82	84	98%	92% to 99%
Dec	43	43	100%	92% to 100%

Peak flowering in Feb. Each bar is the share of Heterotheca subaxillaris 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. 446 of 488 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 Texas found Heterotheca subaxillaris 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

Heterotheca subaxillaris

Camphorweed

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.