When does largeleaf pennywort bloom in North Carolina?

Most often in June. Across 428 dated, research-grade observations of Hydrocotyle bonariensis in North Carolina, the flowering season runs roughly May to September.

Peak June In flower 428 Examined 546 State North Carolina

Flowering 428 in flower of 546 examined

50%

14%

65%

85%

93%

82%

84%

90%

74%

64%

15%

Proportion of examined Hydrocotyle bonariensis in North Carolina in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	3	6	50%	19% to 81%
Feb	0	4	too few examined
Mar	1	7	14%	3% to 51%
Apr	31	48	65%	50% to 77%
May	73	86	85%	76% to 91%
Jun	87	94	93%	85% to 96%
Jul	90	110	82%	74% to 88%
Aug	53	63	84%	73% to 91%
Sep	36	40	90%	77% to 96%
Oct	31	42	74%	59% to 85%
Nov	21	33	64%	47% to 78%
Dec	2	13	15%	4% to 42%

Peak flowering in Jun. Each bar is the share of Hydrocotyle bonariensis in North 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. 428 of 546 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 North Carolina found Hydrocotyle bonariensis in flower, not a forecast. It is computed only from observations made in North 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 North 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.