When does St. Andrew's cross bloom in Texas?

Most often in July. Across 194 dated, research-grade observations of Hypericum hypericoides in Texas, the flowering season runs roughly April to December.

Peak July In flower 194 Examined 224 State Texas

Flowering 194 in flower of 224 examined

50%

91%

59%

92%

97%

96%

97%

88%

78%

83%

Proportion of examined Hypericum hypericoides in Texas in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	1	too few examined
Feb	2	4	too few examined
Mar	3	6	50%	19% to 81%
Apr	21	23	91%	73% to 98%
May	10	17	59%	36% to 78%
Jun	12	13	92%	67% to 99%
Jul	33	34	97%	85% to 99%
Aug	25	26	96%	81% to 99%
Sep	28	29	97%	83% to 99%
Oct	37	42	88%	75% to 95%
Nov	18	23	78%	58% to 90%
Dec	5	6	83%	44% to 97%

Peak flowering in Jul. Each bar is the share of Hypericum hypericoides in Texas 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. 194 of 224 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 2 months have fewer than 5 examined observations, so no proportion is drawn for them. 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 Texas found Hypericum hypericoides in flower, not a forecast. It is computed only from observations made in Texas, 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

Hypericum hypericoides

St. Andrew's cross

Sourcesevery claim on this page

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