When does Common Madia bloom in Oregon?

Most often in September. Across 346 dated, research-grade observations of Madia elegans in Oregon, the flowering season runs roughly May to October.

Peak September In flower 346 Examined 362 State Oregon

Flowering 346 in flower of 362 examined

67%

98%

97%

95%

97%

100%

83%

Proportion of examined Madia elegans in Oregon in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	0	too few examined
Mar	0	1	too few examined
Apr	4	6	67%	30% to 90%
May	55	56	98%	91% to 100%
Jun	89	92	97%	91% to 99%
Jul	103	109	95%	89% to 97%
Aug	66	68	97%	90% to 99%
Sep	23	23	100%	86% to 100%
Oct	5	6	83%	44% to 97%
Nov	1	1	too few examined
Dec	0	0	too few examined

Peak flowering in Sep. Each bar is the share of Madia elegans in Oregon 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. 346 of 362 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 Oregon found Madia elegans in flower, not a forecast. It is computed only from observations made in Oregon, 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

Madia elegans

Common Madia

Sourcesevery claim on this page

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