When does tree tobacco bloom in Texas?

Most often in August. Across 180 dated, research-grade observations of Nicotiana glauca in Texas, the flowering season runs roughly April to August.

Peak August In flower 180 Examined 254 State Texas

Flowering 180 in flower of 254 examined

78%

65%

69%

80%

90%

62%

33%

100%

64%

69%

73%

45%

Proportion of examined Nicotiana glauca in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	14	18	78%	55% to 91%
Feb	13	20	65%	43% to 82%
Mar	24	35	69%	52% to 81%
Apr	40	50	80%	67% to 89%
May	26	29	90%	74% to 96%
Jun	8	13	62%	36% to 82%
Jul	3	9	33%	12% to 65%
Aug	6	6	100%	61% to 100%
Sep	9	14	64%	39% to 84%
Oct	11	16	69%	44% to 86%
Nov	16	22	73%	52% to 87%
Dec	10	22	45%	27% to 65%

Peak flowering in Aug. Each bar is the share of Nicotiana glauca 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. 180 of 254 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 Nicotiana glauca 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

Nicotiana glauca

tree tobacco

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.