When does greenleaf manzanita bloom in Utah?

Most often in May. Across 207 dated, research-grade observations of Arctostaphylos patula in Utah, the flowering season runs roughly February to May.

Peak May In flower 207 Examined 299 State Utah

Flowering 207 in flower of 299 examined

40%

75%

74%

84%

93%

63%

21%

33%

Proportion of examined Arctostaphylos patula in Utah in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	2	5	40%	12% to 77%
Feb	9	12	75%	47% to 91%
Mar	35	47	74%	60% to 85%
Apr	53	63	84%	73% to 91%
May	80	86	93%	86% to 97%
Jun	20	32	63%	45% to 77%
Jul	3	14	21%	8% to 48%
Aug	0	10	0%	0% to 28%
Sep	1	11	9%	2% to 38%
Oct	0	10	0%	0% to 28%
Nov	2	3	too few examined
Dec	2	6	33%	10% to 70%

Peak flowering in May. Each bar is the share of Arctostaphylos patula in Utah 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. 207 of 299 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 Utah found Arctostaphylos patula in flower, not a forecast. It is computed only from observations made in Utah, 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

Arctostaphylos patula

greenleaf manzanita

Sourcesevery claim on this page

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