When does black-eyed Susan bloom in Texas?

Most often in June. Across 1,057 dated, research-grade observations of Rudbeckia hirta in Texas, the flowering season runs roughly April to November.

Peak June In flower 1,057 Examined 1,166 State Texas

Flowering 1,057 in flower of 1,166 examined

50%

46%

50%

89%

96%

99%

98%

95%

73%

86%

73%

Proportion of examined Rudbeckia hirta in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	7	14	50%	27% to 73%
Feb	6	13	46%	23% to 71%
Mar	17	34	50%	34% to 66%
Apr	314	354	89%	85% to 92%
May	323	336	96%	93% to 98%
Jun	230	233	99%	96% to 100%
Jul	81	83	98%	92% to 99%
Aug	21	22	95%	78% to 99%
Sep	16	22	73%	52% to 87%
Oct	19	26	73%	54% to 86%
Nov	12	14	86%	60% to 96%
Dec	11	15	73%	48% to 89%

Peak flowering in Jun. Each bar is the share of Rudbeckia hirta in Texas 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. 1,057 of 1,166 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 Texas found Rudbeckia hirta in flower, not a forecast. It is computed only from observations made in Texas, 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 Texas. 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.