When does wild pennyroyal bloom in Florida?

Most often in February. Across 553 dated, research-grade observations of Piloblephis rigida in Florida, the flowering season runs roughly January to March.

Peak February In flower 553 Examined 676 State Florida

Flowering 553 in flower of 676 examined

83%

97%

95%

72%

20%

25%

38%

60%

66%

Proportion of examined Piloblephis rigida in Florida in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	81	98	83%	74% to 89%
Feb	186	192	97%	93% to 99%
Mar	193	204	95%	91% to 97%
Apr	26	36	72%	56% to 84%
May	4	20	20%	8% to 42%
Jun	0	1	too few examined
Jul	1	5	20%	4% to 62%
Aug	0	5	0%	0% to 43%
Sep	4	16	25%	10% to 50%
Oct	8	21	38%	21% to 59%
Nov	15	25	60%	41% to 77%
Dec	35	53	66%	53% to 77%

Peak flowering in Feb. Each bar is the share of Piloblephis rigida in Florida 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. 553 of 676 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 Florida found Piloblephis rigida in flower, not a forecast. It is computed only from observations made in Florida, 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

Piloblephis rigida

wild pennyroyal

Sourcesevery claim on this page

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