Vegetable · Brassicaceae
Mizuna
Brassica rapa var. nipposinica
Sow it in cool weather, keep it watered, and cut it often, and mizuna keeps feeding you for weeks.
Full sun
Every 2–4 days
39–75°F · 4–24°C
20–45 days
Overview
Mizuna is a Japanese mustard green that races from seed to a first cutting in about three weeks, with feathery, deeply cut leaves and a mild peppery taste landing between arugula and young mustard. It runs in the cabbage family and it moves fast, which is half the fun. Pile it raw into salads or drop it into stir-fries and soups right at the end of cooking.
The real draw is how forgiving it is, so growing it feels like an easy win. This cool-season green takes light frost in stride, bounces back after every cutting, and asks for little beyond steady moisture. Heat is its one soft spot, since hot, long days shove it toward flowering and sour the leaves.
Run it as a cut-and-come-again green and one sowing keeps delivering for weeks, harvest after harvest. Sow in early spring and again in late summer, snap off the outer leaves as you want them, and the plant fires fresh growth right back from the center.
Care
The short version: give mizuna full sun to part shade in cool weather, keep the soil evenly moist, plant it in rich, well-drained ground, and cut the leaves often to keep new ones coming.
Light
Mizuna powers along in full sun, around 6 or more hours a day, but it takes partial shade without missing a beat. When the weather heats up, that bit of afternoon shade earns its keep by slowing the bolting that heat sets off.
Water
Keep the soil evenly moist and the leaves come in fast and tender, exactly what you want. It gets by on leaner soil and less water, but the flavor and quality slide, so water every 2 to 4 days. That steady moisture keeps the greens mild instead of turning them sharp.
Soil
Plant it into well-drained ground rich in organic matter and dig in plenty of compost. A pH between 6.0 and 7.0 suits it, and happily that covers most garden soils with no extra work.
Temperature
Mizuna hits its stride in cool weather, happiest from about 39°F to 75°F (4°C to 24°C). It shrugs off light frost at the low end, while heat near the top drives it to flower and sour.
Humidity
Ordinary humidity, somewhere around 40% to 70%, is all it wants, so skip chasing any number outdoors. Good airflow does the heavy lifting here, since crowded, damp leaves invite pests and rot.
Feeding
Dig aged compost or a balanced, nitrogen-rich feed into the bed before sowing, then feed monthly through the growing season. Nitrogen fuels the leafy growth you are chasing, but ease off, since soft, overfed growth rolls out the welcome mat for aphids.
Pruning
Here the harvest does the pruning. Cut the leaves about 2 inches (5 cm) above the crown or pick the outer ones one at a time, and the plant charges back for cutting after cutting. That cut-and-come-again habit keeps a single sowing rolling for weeks.
Size & spacing
These plants stay compact, hitting 8 to 18 inches (20 to 45 cm) tall and about as wide. Give each one room to fill its 10 to 18 inch (25 to 45 cm) spread so air moves through and the leaves stay clean.
When to plant
Mizuna thrives at the cool ends of the year, so aim it away from the peak of summer. Sow it in early spring the moment you can work the soil, then fire off another sowing in late summer for a fall crop. It takes light frost in stride, which stretches the season well past those first cold nights.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 4-6 weeks before last spring frost, or direct sow
- Plant: early spring and again in late summer; cool-season and frost-tolerant
- Harvest: baby leaves about 21 days, full leaves about 40 days; cut-and-come-again
Hardiness
USDA hardiness zones: 4–9
Temperature: down to -34°C
Troubleshooting
Almost every mizuna hiccup traces back to a few brassica pests and the heat that makes it bolt. Catch the early signs on the leaves and you can head off the worst before it takes hold. Match what you see below and jump on it while it still helps.
Seedlings toppling as the roots give out
When a seedling flags for no obvious reason, tug one up and check the roots, and white grubs boring tunnels give the cabbage maggot away. Pull and bin the plants already under attack, then throw row covers over the bed to shut out the egg-laying flies. Keep rotating your brassicas and steer clear of beds just charged with manure, the very thing that pulls those flies in.
Fix:
- Remove and destroy affected plants
- Use row covers to exclude egg-laying flies
Stalks rocketing up as the leaves sour
Heat and long days flip the switch and mizuna goes for it, throwing up a central flower stalk to bolt while the leaves turn bitter. Race it to the finish, because once temperatures push toward 90°F (32°C) the flavor drops fast, so cut the crop while it still delivers. Fire off a fresh sowing in late summer for a fall run and slip the plants some afternoon shade through any warm stretch.
Fix:
- Harvest promptly before flavor declines
- Resow in late summer for a fall crop
Pinholes peppering the fresh young leaves
Spot a spray of tiny holes on the young leaves and you have caught flea beetles in the act, little dark insects that ping away the instant you move in and hammer seedlings hardest. Beat them to it by draping a floating row cover over the bed the moment you sow, so they never land. Shift new plantings clear of any brassica bed that battled them last year and you take away their head start.
Fix:
- Cover plantings with floating row cover at sowing
- Relocate plantings away from previously infested brassica beds
Soft clusters piling onto the fresh tips
Green or gray colonies crowding the leaf undersides and tender tips, plus that telltale stickiness, mean aphids have moved in. Hit them with a hard jet of water to send most of them flying, then follow up with insecticidal soap on any that regroup. Dial back the nitrogen and you starve out the lush new growth they chase.
Fix:
- Rinse plants with a strong jet of water
- Apply insecticidal soap to affected foliage
Toxicity
Mizuna is a food crop and safe all around, grown for the table and easy on cats, dogs, and every other animal on the place. No part of it is toxic, so there is nothing to keep out of reach. The one mild note is the goitrogens shared across the cabbage family, and those only come into play when livestock graze brassicas hard for a long stretch.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Cats can prowl the patch freely. A quick taste of the peppery leaves does nothing, though a whole mouthful of any greens might loosen a stomach for a while.
Dogs None
Dogs get the all-clear, since nothing here is toxic to them. A little plain leaf lands fine as the occasional treat.
Horses Safe
Horses can graze mizuna with zero drama. It runs in the mustard family, so keep it a bit part of the diet rather than the headline feed.
Rabbits Safe
Rabbits dive right into the tender leaves, and they make a healthy green. Roll it in gradually, the way you would launch any new fresh food.
Livestock Mild
Cattle, goats, and sheep can tuck into mizuna safely. Only heavy, nonstop grazing on brassica forage stirs up the goitrogen effects the family carries, so blend it into other pasture.
Birds Safe
Backyard hens and other birds can peck the leaves with nothing to fret over. The greens toss useful variety into their feed.
People Safe
Mizuna is grown to eat, so go for it raw in salads or wilted into a dish. Healthy people have nothing here to dodge.
Like other brassicas it contains glucosinolate goitrogens, which are mainly a concern for heavily grazed livestock rather than household pets.
Varieties
Mizuna keeps it simple with just a couple of common forms, and the pick really comes down to color. Both grow and taste much the same, so grab whichever catches your eye.
Mizuna (green)
The classic green pick throws out feathery, deeply serrated leaves on thin white stems and tastes mildly peppery.
Red Kingdom / purple mizuna
The burgundy-tinged type with purple stems brings real color punch to a salad mix.
How to propagate
Mizuna grows from seed and nothing else, and it ranks among the easiest greens to launch. Sow it straight into the ground and the first cutting is only weeks off.
SeedEasy
Direct sow in early spring and again in late summer; succession sow for continuous harvest · Germinates in about 4-8 days at 55-75°F; baby leaves ready in roughly 21 days
Mizuna leaps straight from seed sown right where it will grow, so skip the transplant fuss entirely. Drop it 1/4 to 1/2 inch deep into cool, moist soil and it bursts up in about 4 to 8 days, with baby leaves to snip in roughly 21 days. Slot in a fresh row every couple of weeks, run it cut-and-come-again, and greens keep rolling in nonstop.
Myths
Mizuna is a hot, sharp mustard you have to cook before eating.
Forget the fire, since the flavor stays mild with just a gentle peppery edge. Raw in salads is where it truly shines, and it braises beautifully too, so cooking is a choice you get to make and never a rule.
Mizuna is a warm-season green that needs summer heat to thrive.
Far from it, this is a cool-season crop that laughs off light frost and holds off bolting. Spring and fall are prime time, while summer heat is exactly what drives it to flower and turn bitter.