When does Caesarweed bloom in Florida?

Most often in October. Across 242 dated, research-grade observations of Urena lobata in Florida, the flowering season runs roughly January to November.

Peak October In flower 242 Examined 349 State Florida

Flowering 242 in flower of 349 examined

71%

74%

52%

59%

67%

46%

20%

67%

78%

86%

75%

65%

Proportion of examined Urena lobata in Florida in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	32	45	71%	57% to 82%
Feb	14	19	74%	51% to 88%
Mar	13	25	52%	34% to 70%
Apr	16	27	59%	41% to 75%
May	12	18	67%	44% to 84%
Jun	6	13	46%	23% to 71%
Jul	2	10	20%	6% to 51%
Aug	6	9	67%	35% to 88%
Sep	28	36	78%	62% to 88%
Oct	51	59	86%	75% to 93%
Nov	36	48	75%	61% to 85%
Dec	26	40	65%	50% to 78%

Peak flowering in Oct. Each bar is the share of Urena lobata 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. 242 of 349 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 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 Urena lobata 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

Urena lobata

Caesarweed

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.