When does crowpoison bloom in Texas?

Most often in May. Across 919 dated, research-grade observations of Nothoscordum bivalve in Texas, the flowering season runs roughly January to December.

Peak May In flower 919 Examined 991 State Texas

Flowering 919 in flower of 991 examined

96%

93%

92%

93%

100%

97%

95%

89%

88%

Proportion of examined Nothoscordum bivalve in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	43	45	96%	85% to 99%
Feb	152	163	93%	88% to 96%
Mar	331	361	92%	88% to 94%
Apr	164	176	93%	88% to 96%
May	23	23	100%	86% to 100%
Jun	4	4	too few examined
Jul	2	2	too few examined
Aug	2	2	too few examined
Sep	37	38	97%	87% to 100%
Oct	58	61	95%	87% to 98%
Nov	67	75	89%	80% to 95%
Dec	36	41	88%	74% to 95%

Peak flowering in May. Each bar is the share of Nothoscordum bivalve 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. 919 of 991 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 3 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 Texas found Nothoscordum bivalve 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

Nothoscordum bivalve

crowpoison

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.