When does hobblebush bloom in New Hampshire?

Most often in May. Across 393 dated, research-grade observations of Viburnum lantanoides in New Hampshire, the flowering season runs roughly May.

Peak May In flower 393 Examined 1,832 State New Hampshire

Flowering 393 in flower of 1,832 examined

49%

21%

Proportion of examined Viburnum lantanoides in New Hampshire in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	34	0%	0% to 10%
Feb	0	11	0%	0% to 26%
Mar	0	38	0%	0% to 9%
Apr	11	148	7%	4% to 13%
May	318	649	49%	45% to 53%
Jun	64	299	21%	17% to 26%
Jul	0	124	0%	0% to 3%
Aug	0	226	0%	0% to 2%
Sep	0	180	0%	0% to 2%
Oct	0	85	0%	0% to 4%
Nov	0	28	0%	0% to 12%
Dec	0	10	0%	0% to 28%

Peak flowering in May. Each bar is the share of Viburnum lantanoides in New Hampshire 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. 393 of 1,832 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 New Hampshire found Viburnum lantanoides in flower, not a forecast. It is computed only from observations made in New Hampshire, 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

Viburnum lantanoides

hobblebush

Sourcesevery claim on this page

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