Sweet marjoram
Origanum majorana
A tender Mediterranean culinary herb - a bushy little sub-shrub with reddish square stems and rounded, gray-green aromatic leaves that grows in an upright mound to 12 to 24 inches. Tiny white-to-pale-pink flowers open from knot-like bud clusters in summer, the trait behind the alternate name "knotted marjoram." Hardy only in USDA zones 9-10; everywhere colder it is grown as a warm-season annual or a pot herb brought in before frost.
Climate fit: narrow (24/100)
Edible
Container
Border
Light
Full sun
Water
Low water
Mature size
8-24" tall · 12" apart
Hardy in zones
9a-10b
frosty to mild winters
AHS heat range
6-12
Plant range authored in AHS heat-zone terms.
Native in Illinois
No
A classic culinary herb - the sweet, milder, more floral cousin of oregano.
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
Won't grow here
In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.
✕
Out of range today and still out of range in 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 4 ecoregions - 3 climate-resilient through 2070 · 1 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
Sweet marjoram educator packet
A tender Mediterranean culinary herb - a bushy little sub-shrub with reddish square stems and rounded, gray-green aromatic leaves that grows in an upright mound to 12 to 24 inches. Tiny white-to-pale-pink flowers open from knot-like bud clusters in summer, the trait behind the alternate name "knotted marjoram." Hardy only in USDA zones 9-10; everywhere colder it is grown as a warm-season annual or a pot herb brought in before frost.
Scientific name
Origanum majorana
Plant type
herb
Hardiness
9a-10b
Light
full-sun
Moisture
low
Spacing
12 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). Sweet marjoram (Origanum majorana). Retrieved 2026, August 20, from https://plotwright.com/plants/origanum-majorana
Sources used for this record
This record is compiled from the sources below.





