When does velvetweed bloom in Texas?

Most often in April. Across 170 dated, research-grade observations of Oenothera curtiflora in Texas, the flowering season runs roughly March to September.

Peak April In flower 170 Examined 203 State Texas

Flowering 170 in flower of 203 examined

76%

90%

89%

76%

69%

86%

81%

Proportion of examined Oenothera curtiflora in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	1	1	too few examined
Feb	0	0	too few examined
Mar	13	17	76%	53% to 90%
Apr	63	70	90%	81% to 95%
May	25	28	89%	73% to 96%
Jun	29	38	76%	61% to 87%
Jul	11	16	69%	44% to 86%
Aug	12	14	86%	60% to 96%
Sep	13	16	81%	57% to 93%
Oct	2	2	too few examined
Nov	1	1	too few examined
Dec	0	0	too few examined

Peak flowering in Apr. Each bar is the share of Oenothera curtiflora 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. 170 of 203 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 5 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 Oenothera curtiflora 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

Oenothera curtiflora

velvetweed

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.