How to grow sweet marjoram
Origanum majorana · Lamiaceae · Herb
When to plant sweet marjoram: the short answer
Start seeds indoors about 7 weeks before your last spring frost; plant out about 1 week after it; sow outdoors about 1 week after the last frost. Wait until the soil is at least 60°F; sweet marjoram sprout fastest near 70°F.
Zone 5: plant out Apr 30 – May 17. Zone 7: plant out Apr 5 – Apr 22. Zone 9: plant out Feb 20 – Mar 9. See every zone.
Sweet Marjoram is a warm-season herb in the Lamiaceae family, usually started indoors and set out as transplants. It wants full sun (six or more hours of direct light) and little supplemental water once established. From sowing to first pick is about 60–80 days. It is killed by frost, so nothing goes outside until the danger has passed and the soil has warmed.
Grower’s note: Sweeter and more delicate than oregano, and much less hardy - grown as an annual outside the mildest zones, or potted and brought indoors. Poor, dry soil and full sun give the best flavour. Surface-sow; the seed needs light.
Sowing
Sow barely covered — the seed needs light to germinate, into soil between 60–80°F — germination is quickest near 70°F. It is slow and often erratic to germinate (8–21 days). For an early crop, start seed indoors about 7 weeks before your last spring frost and grow it under bright light.
Spacing & layout
Give each plant about 8″ along the row with roughly 10″ between rows. On a square-foot grid that is 4 per square foot. Allow at least 8″ of loose, workable soil for the roots. It grows well in containers at least 8″ deep.
Fitting it to your season
Sweet Marjoram needs roughly 60–80 frost-free days to crop. Where the season is shorter than that, start it indoors and choose the earliest-maturing varieties, or grow it in a container you can move under cover on cold nights. In long, hot-summer regions it can often be planted twice — once in spring and again in mid-to-late summer for a fall harvest.
Quick facts
Growth stages: how long sweet marjoram takes to grow
From seed to first harvest takes roughly 17-19 weeks: about 8 weeks as a seedling indoors, then 60-80 days in the garden.
When to plant sweet marjoram
When to plant sweet marjoram by USDA zone
Dates worked out from each zone’s typical frost dates for 2026. Find your zone on the zone map, or pick your state below for dates from its own frost dates. Zones 11 and above are frost-free, so timing there depends on heat and rain instead.
| Zone | Last / first frost | Start indoors | Sow or plant out |
|---|---|---|---|
| Zone 3 | May 15 / Sep 15 | Mar 20 – Apr 3 | May 15 – Jun 1 |
| Zone 4 | May 10 / Sep 25 | Mar 15 – Mar 29 | May 10 – May 27 |
| Zone 5 | Apr 30 / Oct 5 | Mar 5 – Mar 19 | Apr 30 – May 17 |
| Zone 6 | Apr 15 / Oct 15 | Feb 18 – Mar 4 | Apr 15 – May 2 |
| Zone 7 | Apr 5 / Oct 25 | Feb 8 – Feb 22 | Apr 5 – Apr 22 |
| Zone 8 | Mar 20 / Nov 5 | Jan 23 – Feb 6 | Mar 20 – Apr 6 |
| Zone 9 | Feb 20 / Nov 30 | Dec 26 – Jan 9 | Feb 20 – Mar 9 |
| Zone 10 | Jan 30 / Dec 15 | Dec 5 – Dec 19 | Jan 30 – Feb 16 |
Compare with the other herbs: when to plant herbs, by zone.
Companions
Bell Pepper, Eggplant
No strong antagonists recorded.
Common problems
Pests: aphids, spider mite.
Diseases & disorders: root rot, damping off.
Same family (Lamiaceae)
Rotate these so they don’t follow each other in the same bed year to year.
Questions gardeners ask
When should I plant sweet marjoram?
Start seeds indoors about 7 weeks before your last spring frost; plant out about 1 week after it; sow outdoors about 1 week after the last frost. Wait until the soil is at least 60°F. The table on this page gives dates for each USDA zone, and the planting calendar gives dates for your own state or ZIP code.
How long does sweet marjoram take to grow?
About 60-80 days from transplanting to the first harvest, or roughly 17-19 weeks from sowing the seed indoors. Seeds germinate in 8-21 days.
How much sun does sweet marjoram need?
It needs at least six to eight hours of direct sun a day.
What soil pH does sweet marjoram need?
A soil pH between 6.5 and 7.5. Test before adding lime or sulfur - see the soil pH and testing guide.
How far apart should I plant sweet marjoram?
Space plants about 8 inches apart in rows 10 inches apart, or 4 per square foot in a square-foot bed. Sow seeds about ⅛ inch deep.
Can I grow sweet marjoram in a container?
Yes. Use a container at least 8 inches deep with drainage holes and a good potting mix, and water more often than you would in the ground.
Figures are typical home-garden ranges from Cooperative Extension planting guides, cross-checked against multiple state sources. Your variety and conditions will vary.