When does largeleaf pennywort bloom in South Carolina?

Most often in September. Across 216 dated, research-grade observations of Hydrocotyle bonariensis in South Carolina, the flowering season runs roughly April to November.

Peak September In flower 216 Examined 254 State South Carolina

Flowering 216 in flower of 254 examined

38%

20%

87%

94%

93%

94%

88%

100%

72%

81%

50%

Proportion of examined Hydrocotyle bonariensis in South Carolina in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	3	8	38%	14% to 69%
Feb	0	2	too few examined
Mar	1	5	20%	4% to 62%
Apr	13	15	87%	62% to 96%
May	47	50	94%	84% to 98%
Jun	41	44	93%	82% to 98%
Jul	31	33	94%	80% to 98%
Aug	29	33	88%	73% to 95%
Sep	17	17	100%	82% to 100%
Oct	13	18	72%	49% to 88%
Nov	17	21	81%	60% to 92%
Dec	4	8	50%	22% to 78%

Peak flowering in Sep. Each bar is the share of Hydrocotyle bonariensis in South Carolina 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. 216 of 254 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 South Carolina found Hydrocotyle bonariensis in flower, not a forecast. It is computed only from observations made in South Carolina, 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

Hydrocotyle bonariensis

largeleaf pennywort

Sourcesevery claim on this page

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