When does Parry's beargrass bloom in California?

Most often in June. Across 391 dated, research-grade observations of Nolina parryi in California, the flowering season runs roughly May to June.

Peak June In flower 391 Examined 1,129 State California

Flowering 391 in flower of 1,129 examined

13%

16%

13%

45%

62%

71%

48%

38%

21%

10%

27%

20%

Proportion of examined Nolina parryi in California in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	8	60	13%	7% to 24%
Feb	9	56	16%	9% to 28%
Mar	18	136	13%	9% to 20%
Apr	89	196	45%	39% to 52%
May	101	164	62%	54% to 69%
Jun	60	85	71%	60% to 79%
Jul	20	42	48%	33% to 62%
Aug	15	39	38%	25% to 54%
Sep	15	70	21%	13% to 32%
Oct	9	86	10%	6% to 19%
Nov	31	115	27%	20% to 36%
Dec	16	80	20%	13% to 30%

Peak flowering in Jun. Each bar is the share of Nolina parryi in California 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. 391 of 1,129 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 California found Nolina parryi in flower, not a forecast. It is computed only from observations made in California, 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

Nolina parryi

Parry's beargrass

Sourcesevery claim on this page

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