Growing Wasabi Plants: A Detailed Guide To Planting And Caring For Wasabi

  • By: Succulents Plants
  • Date: December 29, 2022
  • Time to read: 9 min.
Growing Wasabi Plants
Photo by courtesy of Jonathan Austin Daniels

Have you ever tried eating wasabi, the sharp-tasting green paste served with sushi? If so, you might be surprised to learn that the wasabi plant can be grown in your garden! Growing wasabi is relatively easy; you need to know a few basics about its soil, climate, and fertilizer requirements. This guide will provide a detailed overview of everything you need to know about planting, caring for, and harvesting your wasabi plant. Let’s get started!

Where can wasabi be grown?

Wasabi plants are native to Japan and thrive in a cool, humid climate. However, they can be grown in other parts of the world if the conditions are met.

The ideal temperature range for wasabi is between 15 and 18 degrees Celsius, but they can still survive in temperatures in the mid-20s. Remember that they will produce less yield in warmer climates. They also need a good amount of moisture, so water them regularly. If you’re in a drier climate, consider installing a humidifier.

Wasabi also needs partial to full shade to survive. Planting the wasabi in a shaded area, such as under trees or near a wall, is ideal. It’s also important not to expose the roots to waterlogged soil, as this could cause them to rot. Make sure to plant your wasabi in well-draining soil to prevent this.

Wasabi plants prefer slightly acidic soil, with a pH between 5.5 and 6.5. You can purchase a soil pH tester at any garden supply store to check your pH level. Adding organic matter to the soil can help maintain a good pH balance.

Wasabi plants can be grown outside in the right conditions. But if you live in an area with an extreme climate, consider growing them indoors instead.

Soil Conditions

Firstly, the soil needs to be moist but not soggy, and you should avoid over-watering. The best type of soil for growing wasabi is a rich organic loam with a neutral pH. If you find a specific wasabi soil mix, that is ideal, but regular soil mixed with compost is also suitable. Nutrients like phosphorus and nitrogen are beneficial for the wasabi plant, and you can add these to the soil to ensure that it is healthy and contains the necessary nutrients for the wasabi to thrive.

The soil should also meet the drainage requirements needed by the wasabi plant. Wasabi plants need plenty of water, but the soil should also be able to drain away the excess. Choose a spot with multiple drainage holes and make sure they are free from blockages.

As wasabi is a tropical plant, the soil should always be warm and humid. If you live in an area with a cold climate, consider using a raised bed or a greenhouse to keep the soil warm. This will help the wasabi plant to thrive as it grows.

Finally, make sure to deal with pests or weeds quickly and appropriately. Pests can damage the wasabi plants and make them vulnerable to diseases, so it’s essential to take action quickly if you spot any signs of pests or weeds.

Climate Requirements

When it comes to the climate requirements of a wasabi plant, it’s important to remember that it is a plant native to East Asia, primarily Japan. The plant loves moist, shady areas and humid climates, meaning it needs a cool, shady place with plenty of moisture. This is why wasabi is typically grown in shaded greenhouses or even outdoors in the shade. When it comes to temperature, wasabi plants can survive temperatures as low as 20°F, but they tend to do the best with temperatures between 38°F and 75°F.

When it comes to the soil in which you grow wasabi plants, it needs to be rich and well-draining. You should be sure to mix in plenty of organic matter, such as compost or aged manure, to increase soil fertility. Additionally, the soil should be slightly acidic, with a pH between 5.5 and 6.5. A well-draining soil is essential, as the wasabi plant does not tolerate soggy, waterlogged soil.

You also must ensure that the climate in which you are growing the wasabi plant is reliably moist. The wasabi plant needs regular watering and does not do well in areas with low humidity. The optimal amount of water for the wasabi plant is about 6 inches per year. The plant also benefits from regular misting and overhead watering, as this helps keep the plant’s leaves healthy.

How to Plant Wasabi

First, you will need to find a spot to plant your wasabi. The best place for wasabi is in a well-drained, shaded area. Wasabi requires moist soil, so ensure the spot you choose has enough moisture to keep your plant healthy. Also, be sure to keep your wasabi away from direct sunlight, as this can cause it to become scorched and dried out.

Once you have found a suitable spot, it is time to prepare the soil. Before you plant your wasabi, mix some organic matter, such as peat moss or compost, into the soil. This will improve the soil’s drainage and aeration, ensuring that your wasabi has the best-growing environment.

Next, you can finally plant your wasabi. When planting your wasabi, keep in mind the type of soil you are using. If the soil is too compact and dense, you may need to mix in some sand or gravel to improve aeration. Plant your wasabi in small clumps, and make sure to space the clumps at least 25 cm apart.

Finally, it is time to water your wasabi. Watering should be done in the evening, allowing the water to absorb into the soil overnight. It would be best to keep an eye on your wasabi and water it whenever necessary. Too much water can lead to root rot, so water your wasabi sparingly.

Preparation of the Soil

Before planting your wasabi, it’s essential to prepare the soil. Wasabi plants prefer moist and well-draining soils, so you’ll want to ensure your soil is prepared accordingly. If you’re planting in a container, use a light soil mixture, such as a mixture of equal parts peat moss, garden compost, and loam.

When planting in a garden, it’s best to work the soil to loosen it up and ensure it’s free of weeds and other debris before planting. You’ll also want to test the soil’s pH level and adjust it accordingly. Wasabi plants do best in slightly acidic soils with a pH of 5.5-6.5. If the soil is not in this range, you can amend it with sulfur or aluminum sulfate to lower the pH and lime to raise it.

Make sure to work some aged manure or compost into the soil before planting. This will provide the wasabi plant with the nutrients it needs to thrive. Finally, if you’re planting in a garden, it’s a good idea to create raised beds for better drainage. Once the soil is prepared, you’re ready to plant your wasabi plant.

Propagating Wasabi

Propagating the wasabi plant is a project for the patient and dedicated gardener. Despite its notoriety as a sushi delicacy, wasabi is an incredibly unique and demanding plant to cultivate. Wasabi prefers damp and shady climates and can be difficult to propagate indoors, so the best approach to starting a wasabi plant is through propagating. There are two main methods to propagating wasabi, by stem cuttings and by seed—each with its specific requirements and techniques.

When propagating by stem cuttings, choosing a healthy stem of an existing wasabi plant is essential. The cutting should be done with a clean pair of scissors, and the cutting should be taken from a section between two nodes—areas where the stem branches off. The cutting should then be removed from the base of the plant, about a quarter inch above the soil.

Once the stem is cut, the cutting should be placed into a tray or container filled with moist and airy soil. Plant the stem slightly deeper into the soil than it was in the parent plant and water the container with a spray bottle. The cutting should be kept in a cool, well-lit area and watered regularly. The ideal temperature range for growing wasabi is between 18 and 20 degrees Celsius.

The seeds should be sown in damp, consistent soil for propagating by seed. The seeds should be planted about one-eighth of an inch deep in the soil and watered regularly, but the soil must not be overwatered. The ideal temperature range for growing wasabi by seed is between 20 and 25 degrees Celsius.

Whether propagating by seed or by stem cuttings, it’s essential to monitor the soil’s moisture—soil that is too dry or too wet will inhibit the growth of the wasabi plant. Once the plants begin sprouting, they should be grown in larger, well-lit containers, as wasabi is a large, fast-growing plant.

Water Requirements

Wasabi plants are typically grown in wet, humid conditions similar to those in their natural tropical and subtropical habitats. As such, wasabi plants need to maintain consistently moist, but not wet, soil. Water your wasabi plants profoundly and regularly, about twice a week or more often in hot weather, making sure to saturate the soil thoroughly. If possible, use filtered or rain water, as wasabi plants do not tolerate salty irrigation water.

During the growing season, wasabi will benefit from weekly misting with a light-mist sprayer. This helps to maintain the moist, humid conditions necessary for proper growth and will help to combat any adverse weather or temperatures. Wasabi is also sensitive to frost and should be covered if temperatures drop below 60 degrees Fahrenheit. In winter, the plant will go dormant, and you can reduce the amount of water but should not let the soil dry out completely. You can tell if your wasabi plant requires water when the soil begins to feel dry.

In conclusion, ensuring that your wasabi plants receive the correct water is essential for growing healthy, vibrant plants. Although it may seem tricky, following the guidelines outlined above will ensure that your wasabi plants receive the moisture they need.


First and foremost, you should use only natural, organic fertilizers. The delicate wasabi plant is sensitive, and chemical-based fertilizers can quickly burn the root system.

When fertilizing your wasabi plants, a good rule is to wait until two weeks after planting before giving them their first feeding. This gives the root system time to establish itself. After that, you can fertilize them once every two weeks, through the growing season, until late summer. In late summer, you can begin to reduce the amount of fertilizer you give your wasabi plants.

It’s essential to remember that wasabi plants are sensitive to over-fertilizing. Too much fertilizer can cause the leaves to turn yellow and stunted. Keep the fertilizer you’re giving your wasabi plants low and consistent, and avoid giving too much in one go.

The best fertilizer for wasabi plants combines fish emulsion and liquid seaweed. This combination provides the essential nitrogen, phosphorus, and potassium that wasabi plants need to grow and produce healthy leaves. Mix one tablespoon of fish emulsion and one tablespoon of liquid seaweed in one gallon of water, and use this mixture to feed your wasabi plants.



Harvesting wasabi is not easy, but with patience and perseverance, you’ll reap the rewards of your hard work! When harvesting, the biggest challenge is timing it correctly. If you harvest too early, the wasabi will have more time to develop its distinct flavor. On the other hand, if you wait too long, the wasabi will go wrong, and you won’t get the full flavor.

To know when to harvest, look for the stems of the plants, which should be about thumb size and turn from green to light yellow. At this point, you can begin harvesting the wasabi plant. Cutting at a 45-degree angle, cut the stem just above the ground. Don’t forget to save a few of the leaves for replanting!

Once you’ve harvested the wasabi, the next step is to prepare it for eating. Don’t let it sit too long; rinse the wasabi as soon as you harvest the wasabi, and then use a vegetable brush to scrub off any dirt or mud. You can enjoy your freshly-harvested wasabi immediately or store it in the refrigerator. If you plan to save some of your wasabi for later, you can freeze it (for up to six months) or dry it.


In conclusion, growing wasabi can be a rewarding and enjoyable experience. The plant is native to eastern Japan’s cool, shady mountain forests, so it can be challenging to grow in other climates. However, with the suitable soil and climate requirements outlined in this article, wasabi can be a fantastic addition to any garden. With proper soil preparation and thoughtful care, wasabi can be a tasty and nutritious addition to any meal. With its unique flavor and aroma, wasabi is a great way to add a flavorful kick to vegetables, fish, or sushi. Growing wasabi can take time and patience, but the delicious rewards are well worth it.


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