When does Pitcher's leatherflower bloom in Texas?

Most often in June. Across 377 dated, research-grade observations of Clematis pitcheri in Texas, the flowering season runs roughly April to September.

Peak June In flower 377 Examined 439 State Texas

Flowering 377 in flower of 439 examined

57%

88%

92%

95%

88%

86%

56%

Proportion of examined Clematis pitcheri in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	1	too few examined
Feb	0	2	too few examined
Mar	13	23	57%	37% to 74%
Apr	81	92	88%	80% to 93%
May	95	103	92%	85% to 96%
Jun	74	78	95%	88% to 98%
Jul	36	38	95%	83% to 99%
Aug	30	34	88%	73% to 95%
Sep	32	37	86%	72% to 94%
Oct	15	27	56%	37% to 72%
Nov	1	2	too few examined
Dec	0	2	too few examined

Peak flowering in Jun. Each bar is the share of Clematis pitcheri 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. 377 of 439 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 Clematis pitcheri 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

Clematis pitcheri

Pitcher's leatherflower

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.