Herb · Lamiaceae
Sweet Marjoram
Origanum majorana
Give it full sun and dry feet, and sweet marjoram unfurls one of the gentlest, sweetest-scented leaves in the herb garden.
Full sun
Every 5–10 days
50–86°F · 10–30°C
60–90 days
Overview
Sweet marjoram is a tender member of the mint family, a close cousin of oregano whose small, soft leaves release a sweet scent threaded with a faint pine note when you brush against them. It hails from the warm Mediterranean, and that origin is written into what it wants: sun, warmth, and soil that drains fast. Ranged in tight knots along each stem sit the rounded, knot-like flower clusters that give it the names knotted marjoram and pot marjoram.
Those tender leaves are its whole point, sweeter and milder on the tongue than oregano, and their flavor thins the moment the plant turns to bloom. Keep pinching the soft stem tips and the plant answers with bushier growth and a longer run of fresh, aromatic foliage. Each stem branches and thickens, crowding itself with small new leaves.
Marjoram is an easy, forgiving herb that asks little. Once its roots take hold it rides out a dry spell without a wilt, yet it has no defense against wet feet or frost. Set in a sunny bed or a movable pot, the low, rounded plant keeps its leaves coming for months before the cold blackens it.
Care
The short version: full sun, light well-drained soil, and water only once the top half has dried. Feed it sparingly, harvest the soft leaves before it flowers, and keep it out of cold, soggy ground.
Light
Marjoram wants full sun, ideally six hours a day or more, and that steady light is what fills the small leaves with aromatic oil. It tolerates a little partial sun, but the brighter the position, the sweeter the scent and the tighter and leafier the plant grows.
Water
Let the top half of the soil dry before you water again, since this herb takes a dry spell in stride far better than it takes wet feet. Once established it draws very little. Cold, soggy soil is the fastest way to soften and rot the roots, so lean toward the dry side.
Soil
It roots best in well-drained sandy loam or loam, the lighter and quicker-draining the better. It settles across a wide pH range from 6.5 to 8.0 and grows well on the alkaline side, in keeping with its Mediterranean origins.
Temperature
Marjoram grows best between 50°F and 86°F (10°C to 30°C) and takes to the heat. It holds no cold hardiness, so even a light frost blackens the leaves and ends the plant.
Humidity
It favors low humidity, around 30% to 50%, matching its dry-country beginnings. Damp, stagnant air settles on the leaves and invites rot and mildew, so give the plant room and let the air move around it.
Feeding
This is a light feeder that needs no more than one balanced feed in spring. Go easy, since too much nitrogen swells soft, sappy leaves and thins the aromatic oil that gives the foliage its scent and flavor.
Pruning
Pinch and harvest the leaves often, before the knot-like flower clusters open, to keep the foliage soft and sweet and the plant full. Cut back any leggy or woody stems, and fresh tender shoots break from lower down.
Repotting
Marjoram rarely needs repotting and grows content a little snug. Move it up only when you see roots circling the pot or poking through the drainage holes, or when the soil dries out unusually fast after watering.
Size & spacing
The plant stays low and compact, reaching 8 to 18 inches (20 to 45 cm) tall with a spread of 8 to 16 inches (20 to 40 cm), a rounded cushion of small leaves. Give each one a little room so air moves freely and the foliage stays dry.
When to plant
Marjoram is frost-tender and holds back until warmth arrives. Start seeds indoors in late winter, set the young plants out only after the last frost when the soil has warmed, and harvest through summer, taking the soft leaves before the knot-like flower clusters split open and turn the flavor bitter.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 6-8 weeks before the last spring frost
- Plant: After all danger of frost has passed and the soil has warmed
- Harvest: Harvest leaves before or as the knot-like flower clusters open in summer for best flavor
Hardiness
USDA hardiness zones: 9–10
Temperature: down to -7°C
Troubleshooting
Marjoram has few real troubles, and most show first in the leaves or at the base of the plant, traced back to too much water or a chill. Look closely at the foliage and the crown for the earliest change. Match what you see below and act before it spreads.
Sagging plant with black-stained stem bases and mushy, decayed roots
A plant slumped and wilting, its stem bases gone dark and its roots soft to the touch, is deep into root and stem rot brought on by cold, waterlogged soil pressing at the crown. Roots that have turned soft, dark, and foul cannot be brought back, so the worst plants are pulled. Watering stops, the soil is left to dry, and container plants shift into a coarse, faster-draining mix.
Fix:
- Stop watering and allow soil to dry
- Improve drainage or move container plants to faster-draining mix
- Remove and discard severely affected plants
Whole plant gone black and limp after one cold night
Marjoram is frost-tender, and one freezing night turns the whole plant black and slack by morning, stems and leaves alike collapsing together. A pot that can be carried indoors ahead of the cold spares it that fate, and replanting in spring is the fallback. Where winters bite, the surest plan is to grow it as an annual.
Fix:
- Replant after danger of frost in spring
- Grow in containers that can be moved indoors before frost
Leaves tasting harsh as rounded flower knots swell
As flowering sets in, the plant pushes its energy up into the rounded, knot-like flower clusters and the seed they carry, and the leaves shed their sweet, tender character for something harsher. Pinching those tight buds off as they swell holds the change back. Leaves gathered and dried before the plant reaches full bloom hold on to the sweetest flavor.
Fix:
- Pinch off developing flower clusters
- Harvest and dry leaves before full bloom
Curled or stippled leaves with tiny insects or webbing
Leaves that curl, freckle with pale stippling, or yellow are usually carrying aphids massed on the soft new tips, or spider mites slung under a haze of fine webbing when the air runs hot and dry. A hard jet of water strips most of them off the foliage. Insecticidal soap worked across the leaf undersides clears the survivors, and a shoot too far gone is best cut away.
Fix:
- Rinse plants with a strong jet of water
- Apply insecticidal soap, covering leaf undersides
- Remove heavily infested shoots
Toxicity
Marjoram is a kitchen herb, safe for you and your family to cook with and eat. The one catch lies in the aromatic essential oils packed into the small leaves, which can give a pet a mild stomach upset if it eats a real mouthful. Keep a pot out of reach of any cat or dog that likes to nibble greenery.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Mild
A cat that chews down a whole mouthful of the soft leaves may drool, bring the wad back up, and pass a loose stool soon after. The aromatic oils in those leaves are the irritant, and a pinch left on a dinner plate is no cause for worry.
Dogs Mild
A dog that tears into the leafy stems may end up with a queasy stomach, some vomiting, or loose stools. The small culinary amounts on a plate pass through without any trouble.
Horses Mild
The same oils packed into the foliage can unsettle a horse's gut if it grazes a real mouthful, showing as mild diarrhea or a dull appetite. A few stray sprigs come to nothing.
Rabbits Mild
A rabbit that gorges on the fragrant leaves may end up with soft stools or a little bloating from the strong oils. A small sprig now and then suits it far better than a free run at the plant.
Livestock Mild
Goats, sheep, and cattle rarely nose out the pungent foliage, and even a large feed of it would bring only a passing bout of digestive upset.
Birds Mild
Pet and backyard birds tend to leave the sharp-scented leaves untouched, and a heavy nibble would at most bring a brief stomach upset.
People Safe
For people, marjoram is a kitchen herb, safe to cook with and eat in any amount you would reasonably use. There is nothing about the plant to keep away from the family.
Aromatic essential oils in the leaves can mildly irritate a pet's digestive tract if large amounts are chewed.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
Only a couple of marjorams turn up in most gardens, told apart by the strength of their scent and how much cold they take. These are the two worth knowing.
Sweet marjoram (Origanum majorana)
This is the standard culinary species, prized for a sweet, mild aroma edged with a faint pine note, and the rounded, knotted flower clusters along its stems are what earn it the name knotted marjoram.
Hardy/Italian marjoram (Origanum × majoricum)
A cross with oregano, it withstands more cold and carries a sharper, more pungent flavor than true sweet marjoram.
How to propagate
Marjoram is easy to multiply, whether you start a tray from its fine seed or root a few soft cuttings off a plant you already grow.
SeedEasy
Start indoors 6-8 weeks before the last frost, or sow outdoors after the soil warms · About 1-2 weeks to germinate; transplant outdoors after frost
Most growers raise marjoram from its dust-fine seed, sown indoors 6 to 8 weeks before the last frost or scattered outdoors once the soil warms. The seed is so tiny that it rests on the surface or is barely dusted over, kept warm and lightly moist. Fine green sprouts push up in about 1 to 2 weeks, and the seedlings move outdoors once frost has passed.
Stem cuttingsModerate
Late spring through summer from non-flowering shoots · Roughly 2-4 weeks to root
A favored plant can be carried on from cuttings taken between late spring and summer. Non-flowering shoots are chosen, their soft tips snipped, the lower leaves stripped from the stem, and the bare ends set into a moist, well-drained mix. Fresh white roots form in roughly 2 to 4 weeks.
Myths
Sweet marjoram and common oregano are identical plants.
They are two separate species that only share a genus. Sweet marjoram (Origanum majorana) tastes sweeter and milder than common oregano (Origanum vulgare), and it surrenders to the cold far sooner. They look alike leaf for leaf, yet cook and grow differently.
Marjoram leaves are dangerously toxic to any cat or dog.
The ASPCA lists it as a mild stomach irritant rather than a serious toxin. A pet that eats a real mouthful of the leaves may vomit or pass loose stools, but the pinch used in cooking is no threat. The risk stays mild and depends on eating it in quantity.