When does Redstem Stork's-bill bloom in Colorado?

Most often in June. Across 299 dated, research-grade observations of Erodium cicutarium in Colorado, the flowering season runs roughly March to December.

Peak June In flower 299 Examined 380 State Colorado

Flowering 299 in flower of 380 examined

35%

69%

84%

92%

93%

100%

67%

80%

77%

42%

45%

82%

Proportion of examined Erodium cicutarium in Colorado in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	7	20	35%	18% to 57%
Feb	18	26	69%	50% to 84%
Mar	52	62	84%	73% to 91%
Apr	70	76	92%	84% to 96%
May	71	76	93%	86% to 97%
Jun	26	26	100%	87% to 100%
Jul	12	18	67%	44% to 84%
Aug	4	5	80%	38% to 96%
Sep	10	13	77%	50% to 92%
Oct	15	36	42%	27% to 58%
Nov	5	11	45%	21% to 72%
Dec	9	11	82%	52% to 95%

Peak flowering in Jun. Each bar is the share of Erodium cicutarium in Colorado 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. 299 of 380 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 Colorado found Erodium cicutarium in flower, not a forecast. It is computed only from observations made in Colorado, 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

Erodium cicutarium

Redstem Stork's-bill

Sourcesevery claim on this page

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