When does Persian silk tree bloom in North Carolina?

Most often in June. Across 426 dated, research-grade observations of Albizia julibrissin in North Carolina, the flowering season runs roughly June to July.

Peak June In flower 426 Examined 999 State North Carolina

Flowering 426 in flower of 999 examined

21%

78%

64%

14%

Proportion of examined Albizia julibrissin in North Carolina in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	1	too few examined
Mar	0	3	too few examined
Apr	1	42	2%	0% to 12%
May	26	124	21%	15% to 29%
Jun	277	355	78%	73% to 82%
Jul	103	162	64%	56% to 71%
Aug	13	90	14%	9% to 23%
Sep	6	88	7%	3% to 14%
Oct	0	105	0%	0% to 4%
Nov	0	27	0%	0% to 12%
Dec	0	2	too few examined

Peak flowering in Jun. Each bar is the share of Albizia julibrissin in North Carolina 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. 426 of 999 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 4 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 North Carolina found Albizia julibrissin in flower, not a forecast. It is computed only from observations made in North Carolina, 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

Albizia julibrissin

Persian silk tree

Sourcesevery claim on this page

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