When does Texas nightshade bloom in Texas?

Most often in September. Across 372 dated, research-grade observations of Solanum triquetrum in Texas, the flowering season runs roughly March to September.

Peak September In flower 372 Examined 534 State Texas

Flowering 372 in flower of 534 examined

52%

55%

88%

73%

57%

53%

90%

77%

93%

55%

72%

70%

Proportion of examined Solanum triquetrum in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	24	46	52%	38% to 66%
Feb	27	49	55%	41% to 68%
Mar	82	93	88%	80% to 93%
Apr	72	98	73%	64% to 81%
May	21	37	57%	41% to 71%
Jun	8	15	53%	30% to 75%
Jul	9	10	90%	60% to 98%
Aug	10	13	77%	50% to 92%
Sep	13	14	93%	69% to 99%
Oct	23	42	55%	40% to 69%
Nov	39	54	72%	59% to 82%
Dec	44	63	70%	58% to 80%

Peak flowering in Sep. Each bar is the share of Solanum triquetrum 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. 372 of 534 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 Solanum triquetrum 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

Solanum triquetrum

Texas nightshade

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.