When does oxeye daisy bloom in Oregon?

Most often in July. Across 365 dated, research-grade observations of Leucanthemum vulgare in Oregon, the flowering season runs roughly May to August.

Peak July In flower 365 Examined 457 State Oregon

Flowering 365 in flower of 457 examined

50%

14%

10%

17%

86%

95%

86%

71%

50%

20%

50%

Proportion of examined Leucanthemum vulgare in Oregon in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	4	8	50%	22% to 78%
Feb	1	7	14%	3% to 51%
Mar	1	10	10%	2% to 40%
Apr	4	24	17%	7% to 36%
May	132	153	86%	80% to 91%
Jun	119	125	95%	90% to 98%
Jul	61	64	95%	87% to 98%
Aug	19	22	86%	67% to 95%
Sep	12	17	71%	47% to 87%
Oct	8	16	50%	28% to 72%
Nov	1	5	20%	4% to 62%
Dec	3	6	50%	19% to 81%

Peak flowering in Jul. Each bar is the share of Leucanthemum vulgare 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. 365 of 457 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 Oregon found Leucanthemum vulgare 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

Leucanthemum vulgare

oxeye daisy

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.