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 with feathery, deeply cut leaves and a mild peppery taste that settles between arugula and young mustard, the kind of green that dresses a plate as easily as it fills a bowl. It belongs to the cabbage family and grows fast, reaching a first cutting in about three weeks. On the table it goes raw into salads or slips into stir-fries and soups at the last minute.
Its charm at home is how little it asks. This is a cool-season crop that takes light frost in stride, returns after each cutting, and wants only steady moisture to keep a windowsill or kitchen bed looking cared for. Heat is its single limit, since warm, long days turn the leaves to flower and to bitterness.
Kept as a cut-and-come-again green, a single sowing folds neatly into the rhythm of a household, giving weeks of picking from one small planting. Sow in early spring and again in late summer, take the outer leaves as the kitchen calls for them, and fresh growth keeps rising 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 so fresh ones keep coming.
Light
Mizuna is at its best in full sun, around 6 or more hours a day, yet it accepts partial shade without protest, which makes it easy to place in a garden of mixed light. When the weather warms, that stretch of afternoon shade becomes a quiet ally, slowing the bolting that heat brings on.
Water
Keep the soil evenly moist and the leaves come in fast and tender, the state you want for the table. It manages on leaner ground with less water, though flavor and quality slip, so water every 2 to 4 days. Steady moisture is what keeps the greens mild rather than sharp.
Soil
Give it well-drained ground rich in organic matter, with plenty of compost worked through, and it settles in happily. A pH between 6.0 and 7.0 suits it, a range that covers most garden soils without special effort.
Temperature
Mizuna keeps to cool weather, most content from about 39°F to 75°F (4°C to 24°C). It takes light frost at the low end in stride, while heat near the top hurries it into flower and turns the leaves bitter.
Humidity
Ordinary humidity, roughly 40% to 70%, is all it asks, so there is no figure to chase outdoors. Good airflow counts for more than the reading, since crowded, damp leaves invite pests and rot.
Feeding
Work aged compost or a balanced, nitrogen-rich feed into the bed before sowing, then feed monthly through the growing season. Nitrogen carries the leafy growth you are after, but a measured hand serves best, since soft, overfed growth draws aphids.
Pruning
Here harvesting stands in for pruning. Cut the leaves about 2 inches (5 cm) above the crown or take the outer leaves one by one, and the plant regrows for cutting after cutting. That cut-and-come-again habit is what carries a single sowing through weeks of meals.
Size & spacing
The plants stay compact, reaching 8 to 18 inches (20 to 45 cm) tall and roughly as wide, an easy fit for a bed or a large pot. Give each its 10 to 18 inch (25 to 45 cm) spread so air moves freely and the leaves stay clean.
When to plant
Mizuna belongs to the cooler edges of the calendar rather than the height of summer, a green that suits the shoulder seasons of a garden. Sow it in early spring the moment the soil can be worked, then again in late summer for a fall crop. Its ease with light frost lets the picking carry on well past the 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
Most of what troubles mizuna comes down to a handful of brassica pests and the heat that sends it to flower. Reading the early signs on the leaves usually lets you settle the matter before it spreads. Match what you see below and act while it still counts.
Young plants fading from the roots up
A seedling that droops with no dry soil to blame is worth lifting, and roots laced with white grubs and tunnels reveal the cabbage maggot. Clearing the affected plants and setting row covers over the bed keeps the egg-laying flies at bay. Rotating brassicas through the garden and passing over beds freshly turned with manure, which the flies find irresistible, keeps future plantings out of harm's way.
Fix:
- Remove and destroy affected plants
- Use row covers to exclude egg-laying flies
Stalks rising as the season turns warm
Warmth and lengthening light coax mizuna to bolt, lifting a flower stalk while the leaves lose their easy mildness. As the thermometer climbs toward 90°F (32°C) the moment has passed, so gather the crop while the flavor is still worth the table. A late-summer sowing brings the greens back for autumn, and a little afternoon shade eases them through any warm spell.
Fix:
- Harvest promptly before flavor declines
- Resow in late summer for a fall crop
A dusting of pinholes across young leaves
A fine speckle of holes on the youngest leaves is usually flea beetles at work, small dark insects that scatter as you lean in and treat seedlings as their favorite table. A floating row cover laid over the bed at sowing keeps that first course off the menu. Setting new plantings apart from any brassica patch that struggled last season keeps the problem from following the crop.
Fix:
- Cover plantings with floating row cover at sowing
- Relocate plantings away from previously infested brassica beds
Soft clusters gathering on the fresh tips
Green or gray clusters massing beneath the leaves and along the tips, paired with a faint stickiness, point to aphids. A firm rinse of water clears most of them in a moment, and insecticidal soap tidies up anything that lingers. A lighter hand with nitrogen keeps the soft growth they seek out from taking over.
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 gentle company for cats, dogs, and the other animals in a country household. No part of it is toxic, so nothing needs keeping out of reach. The one mild note is the goitrogens shared across the cabbage family, which come into play only when livestock graze brassicas heavily over a long stretch.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Cats can share the space with ease. A taste of the peppery leaves does no harm, though a generous helping of any greens may briefly unsettle a stomach.
Dogs None
With nothing toxic in the leaves, dogs are welcome companions in the garden. A little plain foliage makes a fine occasional treat.
Horses Safe
Horses take to mizuna without trouble. As a mustard-family green it suits a supporting role in the diet rather than a leading one.
Rabbits Safe
Rabbits favor the tender leaves, a wholesome green to offer. Bring it into their diet by degrees, as with any new fresh food.
Livestock Mild
Cattle, goats, and sheep graze mizuna safely. Only long, heavy grazing on brassica forage risks the goitrogenic note the family carries, so pair it with other pasture.
Birds Safe
Backyard hens and other birds peck the leaves without concern. The greens lend welcome variety to their feed.
People Safe
Mizuna is grown for the table, at home raw in a salad or wilted into a warm dish. Healthy diners have nothing to avoid.
Like other brassicas it contains glucosinolate goitrogens, which are mainly a concern for heavily grazed livestock rather than household pets.
Varieties
Mizuna keeps to just a couple of common forms, and the choice really turns on color and the look you want on the plate. Both grow and taste much the same.
Mizuna (green)
The familiar green form brings feathery, deeply serrated leaves on slim white stems and a mild peppery note that carries a salad.
Red Kingdom / purple mizuna
The burgundy-tinged version, with its purple stems, earns its place as a color accent in a mixed salad bowl.
How to propagate
Mizuna comes from seed alone, and it is among the most obliging greens to start. Sow it straight into the ground and the first cutting is only weeks away.
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 arrives from seed sown right where it will grow, with none of the ceremony of transplanting. Tuck it 1/4 to 1/2 inch deep into cool, moist soil and it rises in about 4 to 8 days, with baby leaves ready to cut in roughly 21 days. A fresh row every couple of weeks, grown cut-and-come-again, keeps the kitchen in steady supply.
Myths
Mizuna is a fiery, sharp mustard best cooked before eating.
The flavor is gentle, a soft peppery lift rather than any real heat. Raw in a salad is where it belongs, and while it braises gracefully, cooking remains a preference and never a rule.
Mizuna is a warm-season green that needs summer heat to flourish.
In truth it is a cool-season crop, unbothered by light frost and slow to bolt. Spring and fall set the stage for it, while summer heat is the one thing that hurries it into flower and bitterness.