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How to Grow Mizuna

Reviewed by MyLocalPlanting Editorial Team Updated Sources
Mizuna (Brassica rapa var. nipposinica)

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Ready to grow Mizuna?

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Amazon True Leaf

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Supplies You'll Need

Raised Garden Bed Vegetable Garden Soil Hand Trowel Set Watering Can

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Plant Overview

Scientific Name Brassica rapa var. nipposinica
Category vegetable
Days to Maturity 40 days
Starting Method Direct Sow

Growing Requirements

Sun

Partial to Full Sun (4-6 hours)

Water

Regular (1-2 inches/week)

Spacing

6" apart

Depth

0.25" deep

Height

8-18"

Germination

4-7 days

Ready to Grow Mizuna?

Find quality seeds from trusted suppliers.

Buy on Amazon True Leaf Market

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Seed Saving Guide

Easy
Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let plants bolt fully. Harvest seed pods when tan and dry before they shatter.

Processing

Thresh dried stalks to release seeds, winnow to separate from chaff.

Seed Viability

Up to 4 years when stored cool, dark, and dry.

Pro Tip

Mizuna is a Brassica rapa and will cross with other mustard-family plants — isolate by 300 feet for purity.

Seed Storage Supplies

Seed Envelopes Mylar Storage Bags Silica Gel Packets Seed Organizer

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Raised Bed Planting Guides

A 4×8 bed fits 4 per sq ft of Mizuna. See plant counts, spacing grids, and companion pairings for every bed size →

Mizuna Planting Calendar by Zone

Zone 1a Zone 1b Zone 2a Zone 2b Zone 3a Zone 3b Zone 4a Zone 4b Zone 5a Zone 5b Zone 6a Zone 6b Zone 7a Zone 7b Zone 8a Zone 8b Zone 9a Zone 9b Zone 10a Zone 10b Zone 11a Zone 11b Zone 12a Zone 12b Zone 13a

Mizuna Planting Calendar by State

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Frequently Asked Questions

When should I plant Mizuna? +

Sow Mizuna seeds directly in the garden 4 weeks before your last frost date. Use the search on this page to find exact dates for your location.

How long does Mizuna take to grow? +

Mizuna typically matures in about 40 days from planting. Exact timing varies by variety, soil conditions, and local climate.

Should I start Mizuna indoors or direct sow? +

Mizuna does best when direct sown outdoors. Plant seeds directly in the garden at the appropriate time based on your local frost dates.

How much sun does Mizuna need? +

Mizuna requires partial to full sun (4-6 hours) to thrive.

How far apart should I plant Mizuna? +

Space Mizuna plants 6 inches apart to allow adequate airflow and root development.

How much water does Mizuna need? +

Mizuna has regular (1-2 inches/week) water needs. Consistent moisture is important especially during germination and early growth.

Can you save seeds from Mizuna? +

Yes — seed saving difficulty for Mizuna is rated easy. Let plants bolt fully. Harvest seed pods when tan and dry before they shatter. Thresh dried stalks to release seeds, winnow to separate from chaff.

How long do Mizuna seeds last in storage? +

Properly dried and stored Mizuna seeds remain viable for up to 4 years. Store in a cool, dark, dry location in an airtight container with a silica gel packet for best results.

Are Mizuna seeds open-pollinated? +

Yes — Mizuna is open-pollinated, meaning seeds saved from your harvest will grow plants true to the parent variety. This makes it an excellent candidate for building a self-sustaining garden.

About Mizuna

Feathery Japanese mustard green with mild, peppery flavor. Fast-growing, cut-and-come-again. Great for salads, stir-fry, and Asian dishes.

Expect your Mizuna to be ready for harvest in approximately 40 days from planting.

Use the search above or browse by zone or state to find the perfect planting dates for your location.