Yaupon
Ilex vomitoria
Yaupon (Ilex vomitoria) is the caffeine plant of North America, and the name on its label is a seventeenth-century slander. Its leaves and twigs carry caffeine, theobromine and theophylline - the same stimulants as yerba mate and guayusa, its South American cousins in the same genus - and roasted and dried they brew a tea that tastes and works like mate. Early European observers watched Southeastern peoples drink the ceremonial black drink made from it and vomit as part of the ritual, blamed the plant rather than the volume and the fasting, and Aiton fixed the mistake into the epithet vomitoria. Missouri Botanical Garden states outright that the name stems from a misattribution. As a garden shrub it is a slow, dense, thicket-forming broadleaf evergreen of 10 to 20 feet with small glossy toothed leathery leaves, showy translucent red fruit on pollinated females, and the finest twiggy growth in this group, which is why it is the holly that gets clipped into hedges and topiary. Three honest caveats. Like every holly it is dioecious, so a lone female never berries. It stops at zone 7, well short of inkberry. And it suckers hard: across the Texas Post Oak Savannah, released from fire and grazed heavily, yaupon has thickened into the understorey and shaded out the herbaceous layer, so Missouri Botanical Garden's line about removing root suckers unless you are naturalising it is not tidiness advice, it is that whole story in one sentence.
Native: 11 US states
Climate fit: narrow (39/100)
Structure
Border
Light
Full sun / Part shade
Water
Moderate water
Mature size
10-20 ft tall · 8 ft apart
Hardy in zones
7a-9b
cold to frosty winters
Native in Illinois
No
Native across 11 US states and Canadian provinces - a wide-ranging part of North America's plant communities.
Cold hardiness
These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.
Now
Zone 6b
Plotwright
USDA Zone 6b
-5°F to 0°F
Won't grow here
Zone 7a
Plotwright
0°F to 5°F
Marginal
In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.
✕→⚠
Out of range today, but marginally possible by 2050.
Heat tolerance
Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
Loading AHS heat-zone data for this location...
Where this plant fits
Suitable across 26 ecoregions - 14 climate-resilient through 2070 · 1 suited today · 11 newly possible by 2070. Best matches first.
Plant this, not that
Better fit for this place
For Chicago, IL, these are replacement suggestions: similar plants with a stronger hardiness fit now and/or in 2050.
Better fit now and in 2050
Now: well-suited
2050: well-suited
Better fit now and in 2050
Now: well-suited
2050: well-suited
Better fit now and in 2050
Now: well-suited
2050: well-suited
Better fit now and in 2050
Now: well-suited
2050: well-suited
Similar plants
Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
Educator packet
Plant packet
Yaupon educator packet
Yaupon (Ilex vomitoria) is the caffeine plant of North America, and the name on its label is a seventeenth-century slander. Its leaves and twigs carry caffeine, theobromine and theophylline - the same stimulants as yerba mate and guayusa, its South American cousins in the same genus - and roasted and dried they brew a tea that tastes and works like mate. Early European observers watched Southeastern peoples drink the ceremonial black drink made from it and vomit as part of the ritual, blamed the plant rather than the volume and the fasting, and Aiton fixed the mistake into the epithet vomitoria. Missouri Botanical Garden states outright that the name stems from a misattribution. As a garden shrub it is a slow, dense, thicket-forming broadleaf evergreen of 10 to 20 feet with small glossy toothed leathery leaves, showy translucent red fruit on pollinated females, and the finest twiggy growth in this group, which is why it is the holly that gets clipped into hedges and topiary. Three honest caveats. Like every holly it is dioecious, so a lone female never berries. It stops at zone 7, well short of inkberry. And it suckers hard: across the Texas Post Oak Savannah, released from fire and grazed heavily, yaupon has thickened into the understorey and shaded out the herbaceous layer, so Missouri Botanical Garden's line about removing root suckers unless you are naturalising it is not tidiness advice, it is that whole story in one sentence.
Scientific name
Ilex vomitoria
Plant type
shrub
Hardiness
7a-9b
Light
full-sun, part-shade
Moisture
moderate
Spacing
96 inches
Classroom prompts
- Which plant traits are observations, and which are care recommendations?
- How would this plant fit change if the garden location moved warmer, colder, wetter, or drier?
- Which source-backed facts would you cite in a lesson handout?
Use the Sources & citations section below for page citation styles and the field-level source list.
Sources & citations
Cite this page
For lesson plans, articles, or research that uses this page. Use the source cards below to explore the references that informed this record.
Plotwright. (2026, May 17). Yaupon (Ilex vomitoria). Retrieved 2026, August 20, from https://plotwright.com/plants/ilex-vomitoria
Sources used for this record
This record is compiled from the sources below.
Lady Bird Johnson Wildflower Center Native Plant Database
Botanical research database





