When does bracted passionflower bloom in Texas?

Most often in September. Across 156 dated, research-grade observations of Passiflora affinis in Texas, the flowering season runs roughly July to September.

Peak September In flower 156 Examined 319 State Texas

Flowering 156 in flower of 319 examined

20%

50%

68%

78%

84%

35%

Proportion of examined Passiflora affinis in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	5	0%	0% to 43%
Feb	0	0	too few examined
Mar	0	19	0%	0% to 17%
Apr	0	6	0%	0% to 39%
May	4	20	20%	8% to 42%
Jun	13	26	50%	32% to 68%
Jul	23	34	68%	51% to 81%
Aug	38	49	78%	64% to 87%
Sep	62	74	84%	74% to 90%
Oct	14	40	35%	22% to 50%
Nov	1	30	3%	1% to 17%
Dec	1	16	6%	1% to 28%

Peak flowering in Sep. Each bar is the share of Passiflora affinis 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. 156 of 319 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. One month has fewer than 5 examined observations, so no proportion is drawn for it. 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 Passiflora affinis 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

Passiflora affinis

bracted passionflower

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.