When does ground-ivy bloom in New Jersey?

Most often in April. Across 357 dated, research-grade observations of Glechoma hederacea in New Jersey, the flowering season runs roughly April to June.

Peak April In flower 357 Examined 758 State New Jersey

Flowering 357 in flower of 758 examined

47%

99%

98%

83%

11%

Proportion of examined Glechoma hederacea in New Jersey in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	1	109	1%	0% to 5%
Feb	0	62	0%	0% to 6%
Mar	47	99	47%	38% to 57%
Apr	173	175	99%	96% to 100%
May	97	99	98%	93% to 99%
Jun	38	46	83%	69% to 91%
Jul	0	6	0%	0% to 39%
Aug	0	3	too few examined
Sep	0	15	0%	0% to 20%
Oct	0	26	0%	0% to 13%
Nov	1	9	11%	2% to 44%
Dec	0	109	0%	0% to 3%

Peak flowering in Apr. Each bar is the share of Glechoma hederacea 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. 357 of 758 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 New Jersey found Glechoma hederacea 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

Glechoma hederacea

ground-ivy

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.