When does early whitetop fleabane bloom in Florida?

Most often in September. Across 343 dated, research-grade observations of Erigeron vernus in Florida, the flowering season runs roughly January to December.

Peak September In flower 343 Examined 374 State Florida

Flowering 343 in flower of 374 examined

96%

75%

92%

98%

97%

93%

92%

90%

100%

95%

84%

81%

Proportion of examined Erigeron vernus in Florida in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	22	23	96%	79% to 99%
Feb	27	36	75%	59% to 86%
Mar	66	72	92%	83% to 96%
Apr	64	65	98%	92% to 100%
May	37	38	97%	87% to 100%
Jun	14	15	93%	70% to 99%
Jul	24	26	92%	76% to 98%
Aug	19	21	90%	71% to 97%
Sep	17	17	100%	82% to 100%
Oct	20	21	95%	77% to 99%
Nov	16	19	84%	62% to 94%
Dec	17	21	81%	60% to 92%

Peak flowering in Sep. Each bar is the share of Erigeron vernus 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. 343 of 374 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 Erigeron vernus 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

Erigeron vernus

early whitetop fleabane

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.