When does Japanese honeysuckle bloom in New Jersey?

Most often in June. Across 173 dated, research-grade observations of Lonicera japonica in New Jersey, the flowering season runs roughly June to July.

Peak June In flower 173 Examined 331 State New Jersey

Flowering 173 in flower of 331 examined

20%

55%

99%

91%

42%

79%

53%

14%

10%

Proportion of examined Lonicera japonica in New Jersey in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	14	0%	0% to 22%
Feb	1	5	20%	4% to 62%
Mar	1	11	9%	2% to 38%
Apr	0	15	0%	0% to 20%
May	21	38	55%	40% to 70%
Jun	80	81	99%	93% to 100%
Jul	10	11	91%	62% to 98%
Aug	5	12	42%	19% to 68%
Sep	26	33	79%	62% to 89%
Oct	20	38	53%	37% to 68%
Nov	6	42	14%	7% to 28%
Dec	3	31	10%	3% to 25%

Peak flowering in Jun. Each bar is the share of Lonicera japonica in New Jersey 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. 173 of 331 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 Jersey found Lonicera japonica in flower, not a forecast. It is computed only from observations made in New Jersey, 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

Lonicera japonica

Japanese honeysuckle

Sourcesevery claim on this page

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