When does henbit deadnettle bloom in Texas?

Most often in October. Across 1,010 dated, research-grade observations of Lamium amplexicaule in Texas, the flowering season runs roughly January to October.

Peak October In flower 1,010 Examined 1,193 State Texas

Flowering 1,010 in flower of 1,193 examined

84%

85%

94%

85%

38%

100%

72%

66%

Proportion of examined Lamium amplexicaule in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	182	216	84%	79% to 89%
Feb	347	406	85%	82% to 89%
Mar	297	316	94%	91% to 96%
Apr	60	71	85%	74% to 91%
May	3	8	38%	14% to 69%
Jun	1	1	too few examined
Jul	0	0	too few examined
Aug	0	0	too few examined
Sep	1	1	too few examined
Oct	5	5	100%	57% to 100%
Nov	28	39	72%	56% to 83%
Dec	86	130	66%	58% to 74%

Peak flowering in Oct. Each bar is the share of Lamium amplexicaule 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. 1,010 of 1,193 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 4 months have fewer than 5 examined observations, so no proportion is drawn for them. 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 Lamium amplexicaule 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

Lamium amplexicaule

henbit deadnettle

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.