When does purple passionflower bloom in Texas?

Most often in July. Across 1,894 dated, research-grade observations of Passiflora incarnata in Texas, the flowering season runs roughly May to August.

Peak July In flower 1,894 Examined 3,437 State Texas

Flowering 1,894 in flower of 3,437 examined

33%

73%

86%

87%

75%

66%

20%

Proportion of examined Passiflora incarnata in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	1	11	9%	2% to 38%
Feb	1	18	6%	1% to 26%
Mar	1	127	1%	0% to 4%
Apr	233	698	33%	30% to 37%
May	614	842	73%	70% to 76%
Jun	357	413	86%	83% to 89%
Jul	265	305	87%	83% to 90%
Aug	147	197	75%	68% to 80%
Sep	199	300	66%	61% to 71%
Oct	70	345	20%	16% to 25%
Nov	4	121	3%	1% to 8%
Dec	2	60	3%	1% to 11%

Peak flowering in Jul. Each bar is the share of Passiflora incarnata 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. 1,894 of 3,437 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 Passiflora incarnata 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 incarnata

purple 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.