When does Small's jointweed bloom in Florida?

Most often in September. Across 130 dated, research-grade observations of Polygonella myriophylla in Florida, the flowering season runs roughly May to October.

Peak September In flower 130 Examined 190 State Florida

Flowering 130 in flower of 190 examined

32%

76%

83%

88%

87%

97%

100%

83%

40%

17%

Proportion of examined Polygonella myriophylla in Florida in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	4	too few examined
Feb	0	10	0%	0% to 28%
Mar	10	31	32%	19% to 50%
Apr	16	21	76%	55% to 89%
May	25	30	83%	66% to 93%
Jun	14	16	88%	64% to 97%
Jul	13	15	87%	62% to 96%
Aug	28	29	97%	83% to 99%
Sep	11	11	100%	74% to 100%
Oct	10	12	83%	55% to 95%
Nov	2	5	40%	12% to 77%
Dec	1	6	17%	3% to 56%

Peak flowering in Sep. Each bar is the share of Polygonella myriophylla in Florida 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. 130 of 190 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 Florida found Polygonella myriophylla in flower, not a forecast. It is computed only from observations made in Florida, 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

Polygonella myriophylla

Small's jointweed

Sourcesevery claim on this page

GBIF (iNaturalist Research-grade Observations). Dated flowering annotations in Florida. 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.