When does Butterweed bloom in Mississippi?

Most often in May. Across 258 dated, research-grade observations of Packera glabella in Mississippi, the flowering season runs roughly February to May.

Peak May In flower 258 Examined 287 State Mississippi

Flowering 258 in flower of 287 examined

77%

89%

91%

99%

100%

57%

55%

Proportion of examined Packera glabella in Mississippi in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	10	13	77%	50% to 92%
Feb	51	57	89%	79% to 95%
Mar	82	90	91%	83% to 95%
Apr	89	90	99%	94% to 100%
May	10	10	100%	72% to 100%
Jun	3	3	too few examined
Jul	2	3	too few examined
Aug	0	0	too few examined
Sep	1	1	too few examined
Oct	0	2	too few examined
Nov	4	7	57%	25% to 84%
Dec	6	11	55%	28% to 79%

Peak flowering in May. Each bar is the share of Packera glabella in Mississippi 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. 258 of 287 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 5 months have fewer than 5 examined observations, so no proportion is drawn for them. 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 Mississippi found Packera glabella in flower, not a forecast. It is computed only from observations made in Mississippi, 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

Packera glabella

Butterweed

Sourcesevery claim on this page

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