When does Oriental false hawksbeard bloom in Texas?

Most often in May. Across 214 dated, research-grade observations of Youngia japonica in Texas, the flowering season runs roughly March to October.

Peak May In flower 214 Examined 253 State Texas

Flowering 214 in flower of 253 examined

70%

79%

90%

88%

100%

80%

86%

91%

70%

71%

Proportion of examined Youngia japonica in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	19	27	70%	52% to 84%
Feb	22	28	79%	60% to 90%
Mar	57	63	90%	81% to 96%
Apr	51	58	88%	77% to 94%
May	12	12	100%	76% to 100%
Jun	4	4	too few examined
Jul	6	6	100%	61% to 100%
Aug	8	10	80%	49% to 94%
Sep	6	7	86%	49% to 97%
Oct	10	11	91%	62% to 98%
Nov	7	10	70%	40% to 89%
Dec	12	17	71%	47% to 87%

Peak flowering in May. Each bar is the share of Youngia japonica 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. 214 of 253 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. One month has fewer than 5 examined observations, so no proportion is drawn for it. 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 Youngia japonica 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

Youngia japonica

Oriental false hawksbeard

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.