Growing Wasabi Indoors

Edymnion(7a)March 29, 2012

I have some wasabi plants coming in in the next week or two. Since I'm getting two plants in, I plan on trying out both of the traditional growing methods (replicated indoors).

I have a heavily organic fast draining soil that I will keep moist with regular watering, and I have a fired clay chip gravel medium I normally use for bonsai along with a small desk fountain water pump to get a cycling waterfall going in a pot to try and replicate that method.

Has anyone tried growing wasabi indoors before that could give me a few tips/warnings/etc?

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yukkuri_kame(Sunset 19 / USDA 9)

Wasabi likes cold mountain water. I am not so sure your indoor temps will be suitable, but would be delighted if you proved otherwise.

    Bookmark   April 2, 2012 at 4:10AM
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I grew some for years and years in a pot without a running stream. I believe the cold mountain water/stream environment affects the flavor but the plants don't care.

They like low light and damp rich soil. Mine were outside and I would move them into the crawl space under the house to cool off overnight. They start to go downhill when the daytime highs are over 80. You could grow them indoors as a houseplant easily but they will need to be kept in cool humid air. I kept mine indoors over the winter and never had a problem.

If you want the flavor but don't want to sacrifice your roots you can just use the leaves. The flavor is very fragile, you have about 15 minutes to clean and grate the root to get the correct flavor, after that it just tastes like a hot radish. Virtually all of the wasabi you buy at the store is actually horseradish. Wasabi is sweeter.

After a few years the roots will develop side shoots "pups" which are easy to break off and plant in their own pots.

    Bookmark   April 5, 2012 at 2:10PM
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Yeah, I figure that as long as I keep the soil well moistened in the soil one, and the fountain going in the other one, moisture shouldn't be a problem.

And if one starts to look substantially better than the other, I'll move the other into the same conditions.

Only thing I'll have to get that I don't have now is a heavy sulfur fertilizer.

    Bookmark   April 5, 2012 at 6:35PM
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Welp, my wasabi plants came in today.

For the record, Horizen Herbs is *LOUSY* at packing live plants. I would say don't order from them, but they're almost the only people on this continent that sell the things, so beggers can't be choosers.

    Bookmark   April 11, 2012 at 3:32PM
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How did your plants do? I had 20 seeds and one germinated. Same supplier. Not sure how I plan to grow mine out, thinking of some sort of indoor aquaculture.

    Bookmark   September 30, 2012 at 10:50AM
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chilliwin(EU DK 7)

Where can I buy wasabi seeds? Please help me to find some reputable sellers.

    Bookmark   November 8, 2012 at 6:38AM
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chilliwin(EU DK 7)

I have bought few wasabi seeds from eBay. Only one is germinated, expecting more germination. The first leaves are not so healthy so thinking to give super thrive 50 in 1.

    Bookmark   December 19, 2012 at 9:00PM
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Any one have pictures of wasabi growing from seed? Think I am growing a weed and my cat keeps eating it. Also as for suppliers of plants, please post links if allowed.

    Bookmark   January 28, 2013 at 12:33PM
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Hi everyone,

I feel like now I've read everything available in English on the Internet about growing wasabi, indoors and outdoors. Took me all of 20 minutes. :-)

One thing that seems indisputable is that these plants like low light with cool-but-not-freezing humid air. I live in a medieval building in Germany, and immediately thought of growing indoors in our medieval basement... It's got classic beer cellar conditions, so the temperature should never get below 5ðC in winter or above 15ðC in summer and of course the air is rather damp.

And, it has air vents up to street level that also let in some fresh air, a small amount of light, and never direct sunlight (see photo). I don't want to set up artificial lights... so the question is whether the natural light might actually not be *enough* in this case.

An alternative would be a closet off of our unheated stairwell that has a window onto an alley, so it lets in more of the German gray light but never direct sunlight, should the clouds part. It wouldn't be so humid, however.

Anybody have a take on which would be preferable? In the absence of further info, I was thinking of experimenting with a container in each location to see which does better.

@Edymnion, how are your own plants doing?

    Bookmark   November 17, 2013 at 10:24AM
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I'm just about to give it a go - would be good to know what insights anyone has had since last posting if any? thanks guys :-)

    Bookmark   October 27, 2014 at 10:42AM
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I am attempting to grow wasabi in the run-off well of a fountain.

I live in an old house on the mountain in downtown Montreal.

The fountain is in a very protected south-facing courtyard which is surrounded by heated parking garages well beneath grade.

The run-off well itself is a good 4' below grade. Rather tender potted plants have survived winters in this hole.

So I got the wasabi from Fraser's Nursery on Salt Spring Island. And planted it in the wet mud this August past. It has been thriving ever since. The light seems ideal: it has a full sky overhead, but never any sun.

The fountain is an old design and a trickle of water constantly overflows into the run off well. Not a Japanese mountain stream but pretty close.

Winter is coming. And ours are long and hard. So I have built a cold frame-like plexiglass cover for the well. When the days fall consistently below zero, I will cover the wasabi in hay and hope for the best.

I know this situation isn't quite appropriate for the indoor wasabi thread. But it might nonetheless be useful to those who intend to grow this beautiful creature in various unusual fashions.

    Bookmark   November 13, 2014 at 10:17PM
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growing unusual things in unusual fashion is one of the more interesting things to do in gardening!

for adding sulphur, epsom salts (magnesium sulfate) can work

    Bookmark   February 22, 2015 at 7:03PM
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i'm trying to think of how I can cover sections of ny state adirondack park or nearby streams or divert water to a hoop so that it can be heated enough in winter to prevent plant freezing

    Bookmark   February 22, 2015 at 7:05PM
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Stacey Breckel

I love wasabi and it sounds like something I could grow here indoors. My finished basement/bedroom stays cool and humid, and I even have a cool running stream that I can get water from for it :) Now just to get ahold of some plants....

    Bookmark   February 25, 2015 at 11:18PM
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