When does southern honeysuckle bloom in California?

Most often in June. Across 667 dated, research-grade observations of Lonicera subspicata in California, the flowering season runs roughly June.

Peak June In flower 667 Examined 1,198 State California

Flowering 667 in flower of 1,198 examined

35%

36%

54%

58%

75%

94%

69%

27%

15%

21%

27%

50%

Proportion of examined Lonicera subspicata in California in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	6	17	35%	17% to 59%
Feb	9	25	36%	20% to 55%
Mar	19	35	54%	38% to 70%
Apr	69	119	58%	49% to 66%
May	193	259	75%	69% to 79%
Jun	188	201	94%	89% to 96%
Jul	90	131	69%	60% to 76%
Aug	25	93	27%	19% to 37%
Sep	22	149	15%	10% to 21%
Oct	19	92	21%	14% to 30%
Nov	13	49	27%	16% to 40%
Dec	14	28	50%	33% to 67%

Peak flowering in Jun. Each bar is the share of Lonicera subspicata 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. 667 of 1,198 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 Lonicera subspicata 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

Lonicera subspicata

southern honeysuckle

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.