When does fringed twinevine bloom in Texas?

Most often in August. Across 333 dated, research-grade observations of Funastrum cynanchoides in Texas, the flowering season runs roughly July to September.

Peak August In flower 333 Examined 461 State Texas

Flowering 333 in flower of 461 examined

27%

62%

53%

50%

82%

93%

38%

Proportion of examined Funastrum cynanchoides in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	3	too few examined
Feb	0	2	too few examined
Mar	3	11	27%	10% to 57%
Apr	48	77	62%	51% to 72%
May	24	45	53%	39% to 67%
Jun	4	8	50%	22% to 78%
Jul	14	17	82%	59% to 94%
Aug	69	74	93%	85% to 97%
Sep	151	163	93%	88% to 96%
Oct	18	47	38%	26% to 53%
Nov	1	12	8%	1% to 35%
Dec	1	2	too few examined

Peak flowering in Aug. Each bar is the share of Funastrum cynanchoides 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. 333 of 461 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 3 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 Funastrum cynanchoides 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

Funastrum cynanchoides

fringed twinevine

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.