When does bulltongue arrowhead bloom in Florida?

Most often in October. Across 358 dated, research-grade observations of Sagittaria lancifolia in Florida, the flowering season runs roughly January to December.

Peak October In flower 358 Examined 402 State Florida

Flowering 358 in flower of 402 examined

90%

88%

84%

87%

93%

86%

79%

89%

100%

92%

93%

Proportion of examined Sagittaria lancifolia in Florida in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	37	41	90%	77% to 96%
Feb	30	34	88%	73% to 95%
Mar	46	52	88%	77% to 95%
Apr	31	37	84%	69% to 92%
May	41	47	87%	75% to 94%
Jun	14	15	93%	70% to 99%
Jul	12	14	86%	60% to 96%
Aug	15	19	79%	57% to 91%
Sep	24	27	89%	72% to 96%
Oct	16	16	100%	81% to 100%
Nov	54	59	92%	82% to 96%
Dec	38	41	93%	81% to 97%

Peak flowering in Oct. Each bar is the share of Sagittaria lancifolia 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. 358 of 402 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 Florida found Sagittaria lancifolia 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

Sagittaria lancifolia

bulltongue arrowhead

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.