When to Plant Mizuna in Haiku, Hawaii (96708)

Location

Haiku, Hawaii

ZIP Code

96708

USDA Zone

12a

Last Frost

Thursday, January 1, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Thursday, December 4, 2025

Based on last frost Thursday, January 1, 2026 · Zone 12a

Pro tip: Sow Mizuna directly outdoors 4 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Brassica rapa var. nipposinica

Days to Maturity 40 days

Mature Height 8-18"

Spread 8"

☀️ Growing Requirements

☀️

Sun

Partial to Full Sun (4-6 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

6" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 4-7 days

Ready to Plant Mizuna in Haiku?

Get your seeds now so they're ready by Thursday, December 4, 2025.

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🤝 Good Companions

CarrotOnionBeetSpinach

⚠️ Avoid Planting Near

StrawberryTomato

🤝

Full Companion Planting Guide for Mizuna

See which plants help Mizuna thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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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.

🪴

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 →

Frequently Asked Questions

When should I plant Mizuna in Haiku, Hawaii? +

In Haiku (Zone 12a), direct sow Mizuna outdoors around Thursday, December 4, 2025.

What is the last frost date for Haiku, Hawaii? +

The average last spring frost date for Haiku, Hawaii (ZIP 96708) is around Thursday, January 1, 2026. This is based on NOAA climate normals for USDA Zone 12a.

How long does Mizuna take to grow? +

Mizuna typically matures in about 40 days from direct sowing. In Haiku, that means you can expect harvest around Thursday, December 4, 2025 plus 40 days.

Should I start Mizuna indoors or direct sow in Hawaii? +

Mizuna does best when direct sown outdoors. In Haiku, sow directly around Thursday, December 4, 2025.

📚 More Mizuna Planting Guides

🗺️

Mizuna in Hawaii

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 12a Mizuna Guide

All cities in your zone · Avg dates

→

Other Plants for Haiku

Blackberry Blueberry Raspberry Strawberry Basil Chamomile Chives Cilantro Dill Lavender Lemon Balm Marjoram Mint Oregano Parsley Rosemary Sage Tarragon Thyme Acorn Squash Artichoke Arugula Asparagus Beefsteak Tomato Beet Bell Pepper Bok Choy Broccoli Brussels Sprout Butternut Squash Cabbage Cantaloupe Carrot Cauliflower Cayenne Pepper Celery Cherry Tomato Chili Pepper Collard Green Common Bean Cucumber Eggplant Endive Fennel Garlic Grape Tomato Green Bean Habanero Pepper Head Lettuce Heirloom Tomato Honeydew Melon Jalapeño Pepper Kale Kohlrabi Leaf Lettuce Leek Lima Bean Mustard Okra Onion Parsnip Pea Poblano Pepper Pole Pea Potato Pumpkin Radicchio Radish Rhubarb Roma Tomato Rutabaga Serrano Pepper Shallot Snap Pea Snow Pea Spaghetti Squash Spinach Squash Sweet Corn Sweet Potato Swiss Chard Tomato Turnip Watermelon Zucchini Sunflower Marigold Zinnia Nasturtium Cosmos Echinacea (Coneflower) Petunia Black-eyed Susan Apple Tree Pear Tree Peach Tree Plum Tree Sweet Cherry Tree Lemon Tree Borage Lemongrass Ginger Stevia Tomatillo Edamame Fava Bean Mâche Sorrel Shishito Pepper Banana Pepper Watermelon Radish Napa Cabbage Popcorn Broccoli Raab Catnip Valerian Lemon Verbena Bee Balm Anise Lovage Chervil Summer Savory Dahlia Snapdragon Pansy Sweet Pea Morning Glory Hollyhock Larkspur Bachelor Button Columbine Impatiens Salvia (Annual) Sweet Alyssum Celosia Lupine Verbena Elderberry Grape Vine Red Currant Gooseberry Serviceberry Fig Tree Avocado Tree Persimmon Tree Olive Tree

Growing Mizuna in Zone 12a

Mizuna (Brassica rapa var. nipposinica) is a popular garden vegetable. In Haiku, Hawaii, which is in USDA Hardiness Zone 12a, you should direct sow seeds around Thursday, December 4, 2025.

Your average last frost date is Thursday, January 1, 2026. Mizuna grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.