Mizuna

Mizuna (Brassica rapa var. nipposinica) is ready to cut at 20 days from sowing if you harvest baby leaves. That speed, combined with mild flavor and genuine bolt resistance compared to arugula and spinach, makes it one of the most practical additions to a continuous-harvest salad garden. It’s a Japanese mustard green with feathery, deeply cut leaves and a flavor that runs from mild and slightly peppery at baby-leaf stage to more assertive at full size.

It belongs to the same species as bok choy and turnip (Brassica rapa) but was selected in Japan specifically for leaf production. You’ll find it in specialty grocery stores folded into mesclun mix, or sold as loose leaves at farmers markets at $3-5/lb for baby leaf and up to $6-8/lb for specialty bunches (USDA AMS Specialty Crop Market News, regional greens surveys, 2023). It’s almost never at a standard grocery store in its own bin. That gap is where home-growing makes sense.

What you’re actually growing

Mizuna leaves are deeply serrated, bright green, and form loose rosettes rather than tight heads. The flavor at baby stage is mild mustard - less sharp than arugula, more complex than butterhead lettuce. At full size (35-40 days), the flavor intensifies and the texture toughens enough to hold up in a wok.

The standard varieties break into two practical groups: mizuna types with the feathery cut leaves, and mibuna types with smooth strap-like leaves and slightly sweeter flavor. Within mizuna, Early Mizuna and Kyoto Mizuna dominate, with Red Streaks as the ornamental selection and Mibuna as its distinct cousin.

Variety	Leaf type	Days	Flavor	Best use
Early Mizuna	Feathery, green	20-25	Mild mustard	Baby leaf, cut-and-come-again
Kyoto Mizuna	Feathery, deep-cut, green	35-40	More assertive	Full-size harvest, stir-fry
Red Streaks	Feathery, purple-veined	25-30	Similar to Early	Salad mix color, farmers market
Mibuna	Strap-leaf, smooth	30-40	Sweeter, less peppery	Stir-fry, hot pot, salad

Red Streaks holds its color reasonably well in a dressed salad, which matters if you’re selling at market or want visual interest at the table. Mibuna (Brassica rapa var. laciniifolia) is sometimes listed separately but grows under identical conditions; if you find it hard to source, Early Mizuna makes a reasonable substitute.

The ROI case

A $2.49 packet contains more seed than most home gardeners will use in two seasons. Call it 400-600 seeds. At broadcast density for baby leaf (roughly 30 seeds per square foot), that packet plants 15-20 square feet, or about two 4×2 beds.

At cut-and-come-again management, a 4×2 bed (8 square feet) produces three cuts before bolting. Each cut yields roughly 0.5 lb of baby leaves at the dense spacings used for specialty salad greens. Three cuts from 8 square feet = 1.5 lb per planting.

The real multiplier is succession planting. A single spring planting gives you one productive window before the heat ends it. Five successions across spring and fall give you a total season haul from one packet.

Full-season value from one $2.49 packet (Zone 6 example):

Sowing	Window	Yield (8 sq ft, 3 cuts)	Value at $4/lb
Spring 1 (Mar 20)	Apr 9 - May 5	1.5 lb	$6.00
Spring 2 (Apr 5)	Apr 25 - May 18	1.5 lb	$6.00
Spring 3 (Apr 20)	May 10 - Jun 1	1.2 lb (heat shortens window)	$4.80
Fall 1 (Aug 20)	Sep 9 - Oct 10	1.5 lb	$6.00
Fall 2 (Sep 5)	Sep 25 - Oct 28	1.5 lb	$6.00
Season total		~7.2 lb	$28.80

Seed investment: $2.49. Gross value: $28.80. Net: $26.31 from one packet across the full season.

That math assumes retail specialty pricing of $4/lb, which is conservative for loose baby mizuna at a farmers market. It also assumes you manage succession intervals so you’re not drowning in greens all at once, which takes two minutes of calendar work before the season starts.

Succession planting: the schedule that makes this work

The failure mode for mizuna is the same as every fast cool-season green: plant once in spring, harvest briefly, watch it bolt, give up until next year. The crop rewards a little more planning.

Spring and fall windows run in opposite directions relative to day length. Spring plantings are racing the clock - each successive sowing encounters longer days and warmer temperatures, and the last spring sowing bolts fastest. Fall plantings have no such pressure building from the back end. The plant matures as days shorten and cool, which is exactly what mizuna wants.

Zone 5-6 succession calendar:

Season	Sow date	Soil temp	Days to first cut	Productive window	Notes
Spring 1	Mar 15-20	45-50°F	25-28	Apr 9 - May 5	Longest window; coolest temps
Spring 2	Apr 1-5	50-55°F	22-25	Apr 24 - May 18
Spring 3	Apr 18-22	55-60°F	20-22	May 8 - Jun 1	Heat may end it early
Gap	May-Aug	—	—	—	Too hot; skip
Fall 1	Aug 18-22	65-70°F	20-22	Sep 8 - Oct 10	Fast germination in warm soil
Fall 2	Sep 3-7	60-65°F	22-25	Sep 26 - Oct 28
Fall 3	Sep 18-22	55-60°F	25-30	Oct 15 - Nov 15	Row cover extends into Nov

The fall window behaves differently from spring. Warm soil in late August means seeds germinate in 4-5 days instead of 7-10. The plants grow quickly through September, then slow as temperatures drop. That slowdown is actually useful - growth slows enough that the harvest window stretches rather than sprints past you.

In Zone 7 and warmer, mizuna can overwinter without row cover and resume growth in February - a behavior that makes the fall succession calendar worth planning even more carefully.

For Zone 5, a floating row cover over the last fall sowing extends the harvest window by 3-4 weeks, often pushing usable production well into November.

Growing requirements

Direct sow only - mizuna doesn’t transplant well and there’s no reason to try at 20-day turnaround times. Sow 1/8 inch deep, broadcast or in rows 6 inches apart. Germination at 50°F takes 7-10 days; at 65°F, 4-5 days. Keep soil moist through germination.

Soil pH 6.0-7.5. Mizuna is genuinely adaptable and doesn’t need much fertility. Two inches of compost worked in before sowing is enough. Avoid high-nitrogen conditions that produce lush, watery leaves with less flavor.

Full sun to partial shade. In spring, full sun is fine. In late spring when heat is building, afternoon shade buys time before bolting. A spot that gets morning sun and afternoon protection is useful for the last spring succession.

Water consistently at 1 inch per week. Drought stress speeds bolting and produces smaller, more peppery leaves. Consistent moisture is the single variable most in your control.

Mizuna handles frost down to about 25°F without damage. Established plants survive colder snaps better than seedlings. If a hard frost is forecast over young seedlings, cover them; established plants don’t need intervention above 20°F.

Companion planting with radish

Radish planted adjacent to mizuna functions as an aphid trap crop. Aphids preferentially colonize radish over mizuna when both are present, establishing colonies on radish first. This reduces aphid pressure on the mizuna and on adjacent kale, arugula, and other brassicas. NC State Extension and several land-grant extension programs document radish as a sacrificial host plant in brassica systems specifically for this reason.

The practical application: plant a row of radish at the edge of your mizuna bed. Monitor the radish for aphid colonies. When colonies establish on the radish - which they will, usually before you see aphids on the mizuna - pull the infested radish plants and dispose of them, taking the aphid population with them. Given that radish matures in 25 days anyway, you’re removing a crop you’d be harvesting soon regardless.

The timing works well because both crops occupy the same cool-season window and can be interplanted without competing for light or space.

What goes wrong

Flea beetles (Phyllotreta species) put small round holes in young leaves, worst on seedlings in their first week. Row cover at germination prevents almost all damage. If flea beetles have been a problem in previous seasons, cover mizuna from day one and remove the cover once plants reach 4-5 inches tall.

Downy mildew (Peronospora brassicae) causes pale yellow patches on upper leaf surfaces with grayish sporulation underneath. It’s primarily a wet-weather problem in fall plantings. Space plantings for airflow, avoid overhead watering in the evening. Severe cases warrant pulling and composting affected plants to prevent spread.

Aphids cluster on new growth and under leaves. A hard water blast handles light infestations. Insecticidal soap is effective for heavier colonies. The radish trap crop strategy (above) addresses the problem earlier in the cycle.

Bolting is the most common complaint, and it’s almost always a timing problem rather than a variety problem. When the central stem begins to elongate and leaves become smaller and more pointed, the window is closing. Cut immediately if you haven’t already. At baby-leaf stage this doesn’t happen fast enough to catch you off guard; at full-size harvest, you need to be paying attention.

Culinary use

Mizuna’s feathery leaves hold dressing differently than arugula or spinach - the cut surface catches vinaigrette in the notches of each leaf. In a salad, this means you use less dressing for the same coverage. In a warm application, it means the surface area picks up sauce quickly.

At baby-leaf stage, use raw. Pair with a citrus vinaigrette, shaved radishes, sesame, or alongside bolder flavors (blue cheese, walnuts, roasted beets) where the mild mustard note provides contrast without dominating.

At full size, mizuna wilts to almost nothing in a hot pan - from 8 ounces raw to 2 ounces cooked in about 60 seconds over high heat. This makes it useful as a last-minute addition to stir-fries, soups, and broth-based dishes where you want the green to just collapse into the dish rather than stay structural. Add it in the last 30-60 seconds of cooking. Adding it earlier destroys the texture and washes out the flavor.

In Japanese cooking, mizuna is a standard component of nabe (hot pot), where diners add leaves to simmering broth tableside. The same principle applies at home: bring your broth to a simmer, add mizuna, wait 45 seconds, eat. The broth extracts the mild mustard flavor and the leaf softens without disappearing entirely.

Mibuna has slightly sweeter, less peppery flavor than the cut-leaf types and holds its texture a bit longer in the pan - the smooth, thicker leaves cook more slowly than the feathery mizuna. If you’re primarily cooking rather than eating raw, Mibuna is the better choice.

Harvest and storage

For baby leaves: cut 1-2 inches above soil at 20-25 days. The stub regrows; expect 2-3 more cuts at 10-14 day intervals. Each successive cut is slightly smaller as the plant’s energy shifts toward bolting, but the first and second cuts are usually the best.

For full-size plants: cut individual outer leaves at 35-40 days, or cut the entire plant 2 inches above soil for a single large harvest and allow regrowth.

Fresh mizuna is fragile. It wilts faster than most lettuce and goes from crisp to limp within a day at room temperature. Refrigerate immediately after harvest. In a damp paper towel inside a sealed bag, it keeps 3-5 days. Don’t wash until just before use - moisture accelerates breakdown.

For longer storage, blanch briefly in boiling water (30 seconds), plunge in ice water, squeeze dry, and freeze in small portions. Use within 6 months. Thawed mizuna works only in cooked applications - the texture after freezing won’t hold in a salad.

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Related crops: Arugula, Tatsoi

Related reading: Succession Planting Calendar - timing fast-maturing greens in spring and fall to keep cutting throughout both seasons