How to Grow Komatsunas – A Beginner’s Guide

komatsunas plant growing in garden

Komatsunas, which are known botanically as Brassica rapa var. perviridis, are a type of vegetable that can easily be grown at home. Continue reading to learn the basics of growing komatsunas as well as common mistakes to avoid along the way.

Quick Reference Guide for Growing Komatsunas

Best Time to Plant Spring or late summer for fall harvest
Soil Type Well-drained, fertile soil
Soil pH 6.0-7.5
Seed Spacing 1″ apart in rows 12-18″ apart
Seed Depth 0.25-0.5″
Germination Time 5-7 days
Harvest Time 25-35 days
Plant Size 8-18″ tall
Safe for Bees Yes

Best Time to Plant Komatsunas

This will depend largely on your local climate, but as a rule of thumb, begin to plant the komatsuna seeds in spring or late summer for fall harvest. This is the best time to ensure that the seedlings survive the weather.

To check when komatsunas are most likely to thrive in your area, see the USDA Plant Hardiness Zone Map. If you live outside the US, do a quick search for ‘plant hardiness zone + [city]’.

How to Plant Komatsunas the Right Way

There are a number of things to consider that will help you avoid some of the common mistakes of growing komatsunas in your home garden.

Often overlooked, your soil can have a huge impact on how well your komatsunas grow. Generally, your soil should be well-drained and fertile. Soil PH levels should be around 6.0 to 7.5.

Sow the seeds 1″ apart in rows 12-18″ apart at a depth of about 0.25-0.5″. For each plant, be sure to sow at least a few seeds to ensure that at least one of them will germinate.

Begin thinning your komatsuna seedlings 10-12″ apart when seedlings are 1-2″ tall.

How Much Sunlight is Needed to Grow Komatsunas

The amount of sunlight is another key to a successful harvest. Too much sunlight will dry out your komatsunas. Not enough sunlight will stunt your its growth or even kill it.

Ideally, your komatsunas should be getting full sun to partial shade.

How Much to Water Komatsunas

As you’ve figured by now, a lot can have an impact on how well your komatsunas do, and the amount of water is no different.

Ideally, the soil should be damp to touch; not soggy or bone dry. If the leaves on your komatsunas begin to change colors or start to look droopy, you need to adjust how much water you’re giving it.

Unfortunately, if you give it too much or too little water, you can kill it, so it’s best to just keep an eye on it and water as needed.

How Long Does it Take Komatsunas to Germinate and Grow?

Now the fun part begins and you get to watch your komatsunas grow.

It takes approximately 5-7 days to germinate,and a total of 25-35 days from seed to harvest.

When to Harvest Komatsunas

The best time to harvest your komatsunas is when leaves are 3-4″ long.

Komatsunas can grow up to about 8-18″ tall.

What Can Komatsunas Be Used For?

Food Use: both leaves and stems can be used in salads or stir-fries.

Flavor Profile: mild, sweet flavor with a slight mustard taste.

Can Komatsunas Grow in Pots and Containers?

Yes, you can plant up to 1 plant per 12″ container. This can help control weeds and keep your plant from growing out of control.

It also gives you the flexibility to move your komatsunas around if you need to adjust sunlight or bring it indoors to avoid harsh weather conditions.

Are Komatsunas Safe for Bees?

Yes, komatsunas are safe for bees.

According to, bees pollinate human food crops that make up about 90% of the world’s nutrition.

Given their importance in our ecosystem and food supply, it is important to note that growing komatsunas is bee-friendly.

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