When does black-eyed Susan bloom in Mississippi?

Most often in June. Across 307 dated, research-grade observations of Rudbeckia hirta in Mississippi, the flowering season runs roughly May to December.

Peak June In flower 307 Examined 332 State Mississippi

Flowering 307 in flower of 332 examined

33%

67%

79%

95%

99%

98%

95%

81%

75%

88%

Proportion of examined Rudbeckia hirta in Mississippi in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	2	6	33%	10% to 70%
Mar	4	6	67%	30% to 90%
Apr	15	19	79%	57% to 91%
May	70	74	95%	87% to 98%
Jun	113	114	99%	95% to 100%
Jul	46	47	98%	89% to 100%
Aug	19	20	95%	76% to 99%
Sep	21	26	81%	62% to 91%
Oct	6	8	75%	41% to 93%
Nov	4	4	too few examined
Dec	7	8	88%	53% to 98%

Peak flowering in Jun. Each bar is the share of Rudbeckia hirta 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. 307 of 332 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 2 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 Rudbeckia hirta 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

Rudbeckia hirta

black-eyed Susan

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.