Wasabi (Wasabia japonica) packet of 10 seeds
$8.95
Please note: One packet only per order. Limited harvest 2024. If you get an e-mail saying this is back in stock and you cannot buy it, it is because it already sold out. Please remember to hit “waitlist” again, we will have more. Richo
Family: Mustard (Brassicaceae)
Hardy to Zones 7 to 12
(Eutrema japonicum) Herbaceous perennial native to mountain streams of Japan. This is the true wasabi. These cold-stored seeds must be planted in potting soil, about 1/2 inch deep, and mulched with coir or peat, and placed outdoors in COOL MOIST SHADE (not soaked in water or in running water or hydroponic setup, etc.) 5 to 8 month germination times are typical. Germination of this summer or fall planted seed is in the very early spring. By March, the seedlings will have formed 2 sets of true leaves and its time to pot them up. For example, I planted wasabi seeds 6/24/19 and they emerged on 2/16/20–nearly an 8 month induction period. In colder climates, where the propagation beds may be frozen hard, germination will occur later, usually in April or perhaps as late as May. Please note that hard freezing of the germination beds or flats may prove to be harmful for the seed, so if winter temperatures go below 20 degrees F (Zone 7), greenhouse culture is advised. Plant prefers aquaculture or shaded beds of compost, misted daily. Space plants 1 foot apart.
10 Seeds per packet, open pollinated, untreated, no gmo’s
Out of stock
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Question
Gwen –
Hey Richo,
I live in zone 6b. I have a spring beside my house that is shaded with trees. Is there a possibility wasabi could grow there, even if the summer gets hot sometimes? Then move them to the cool basement under lights in the winter? I’d really like to try this if there would be any chance I could pull it off.
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Richo Cech –
Hi Gwen,
Thanks for writing. My friend Joe Hollis lives in a 6b and he’s been growing wasabi in a spring for years and it overwinters–doesn’t have to bring it indoors. Wasabi usually gets very sad when that is done. I hope to have wasabi seed next year, as there is a nice population of plants in the shadehouse that made it through the summer just fine, and they will flower. Sounds like you could naturalize it in your spring. richo
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Katlin –
Hi Richo
I live in zone 11, kula HI at about 3000 ft elevation. It’s usually between65-75 degrees here with some days very sunny and some very overcast. Do you think I could grow wasabi here?
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Richo Cech –
Hi Katlin, Its a bit of kismet that you contact right now with this question as I was just out in the greenhouse examining the siliques of wasabi and finding that they are making some nice fat seeds. Yes, the temperature and elevation are almost ideal for this plant. We’re going to have seeds and plants for sale soon. Please hit “waitlist”. Richo
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Oli –
I purchased a few plants here maybe 2 years ago and they lived in pots and were very sad. I moved one to my hydroponic system and it has thrived but has begun putting out lots and lots of of flowers and seed. I’m wondering if this is a good sign or if it’s stressed. I never seem to get much growth on the rhizome but its only been about 2 months in hydroponics.
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Richo Cech –
Flowering is short-lived and your plants are flowering only slightly later than mine. It is a good sign, and you can propagate more plants from the partially-dried seeds. To make the thick stem that is used in sushi, aquaponics is really essential. To make the leaves used in sandwiches, a moist rich soil and max temp of 75 degrees F is all that is needed. Probably your plants were suffering from too much heat, that is typical.
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Question
AP –
Hello. Do you ship to Argentina?
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Richo Cech –
Hello AP. South America as a whole seems to be difficult for seed receipts. We have learned not to try to send seeds to Argentina. Richo
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Question
birolaszlo171 –
Hi Richo! I joined the waiting list. I want to buy wasabi seeds. Do you ship to Romania? Is winter transport harmful to seeds? Thanks!
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Richo Cech –
hi birolaszlo, thank you for writing. wasabi seed is delivered fresh in the spring to summer, so cold transport does not normally occur. But cold does not harm them, either. In fact they require cold to germinate. Romania is in the EU so unfortunately the laws are very strict and we no longer ship to the EU. richo
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Cliff (verified owner) –
In the fall of 2018 my partner and I planted seeds directly into the soil alongside streams running through our forest. I never found any Wasabi until I noticed it last week growing in one of the sites we planted. I hope in the winter the wasabi is sheltered by the snow and warmed by the moving groundwater, oblivious to the -25F temperature outside.
I do wish we had followed your seed starting instructions. Definitely want to transplant next time. Don’t have a greenhouse however. Do you think we could use your propagation technique in our basement?
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Richo Cech –
Hi Cliff, Thanks for the report, it is a good one. Planting seeds directly in nature is easy and sometimes, as in your case, yields results. A basement isn’t a shadehouse, unfortunately. One is looking for natural precipitation to leach out germination inhibiting factors, also temperature oscillation (although Z 4 is a bit cold for it) and natural light. I don’t usually recommend cold frames because they’re pretty futzy, but a double-pane cold frame, or even a cloche would make sense for you, I think. Something to mitigate that -25, brr. r
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Cliff (verified owner) –
Thank you, i will try a well insulated cold frame. They can be futzy, ive used them more than i like to admit and they can easily reach 100F in late winter on a sunny day…
But for this application, it doesn’t need to be in full sun.
Now im thinking about some other things to try… i could put a tray out in a sheltered place that has enough groundwater not to freeze deep in the winter, and mulch heavily. But then i wont have that temperature variation you mention… would just be a cooler version of our basement.
Perhaps a shallow wooden box with no bottom, set in the ground near a stream and filled with potting soil might be worth a shot. Rely on the same forces of nature that kept our current wasabi alive up here in Maine, and eliminate the pressure from all the other native plants.
I’ll let you know how it goes. Hope to harvest some next year. It still looks small and is struggling to compete with the wild plants around it.
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Question
Charles Liew –
Can mail the seeds Overseas, Singapore?
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Richo Cech –
can not guarantee receipt, too risky
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Question
Mike ozzy (verified owner) –
Hi I planted the seeds and its been 30+ days are they still gonna germinate. Planted as per instructions and keep cool and shaded indoors
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Richo Cech –
hi michael, as far as i know the seed must be planted in outdoor conditions in order to sprout–yes, outdoors in the cool shade. It takes about 5 months. we planted seeds in october and they germinated in march. richo
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Ursula –
Hej wysyłacie poza, granice – do Szwecji? Zależy mi na zakupie
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Richo Cech –
nie wysyłamy do europy, ue lub szwecji. celnicy za każdym razem kradną nasiona
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Question
Roan –
Hi Richo,
Are you able to ship to South Africa?
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Richo Cech –
sorry, no, not successfully anymore
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charles n gichui –
Is this true wasabi? Cultivating is difficult and you make sound easy I’m bent to believe you growing radish
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Richo Cech –
hello charles, photos on this website are all from our own crop. if you think the photos of wasabi that we sell are radishes, then you cannot be helped. r
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Question
Eric –
Do you currently have wasabi seeds available for sale now?
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Richo Cech –
hi eric, sorry i think just sold out for the season. hit ewaitlist and we’ll hopefully have more midspring next year. r
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Patrick –
Hello, I’d love to procure some Wasabi seeds. Do you anticipate a return to stock some before year end?
Thank you,
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Richo Cech –
Hi Patrick, sorry, no, please hit waitlist, these are shipped in season starting midspring. richo
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Unknown –
Hello. I am a resident of South Korea.
I wish to buy some seeds. How do I make the reservation?
I would like to make the purchase as soon as it restocks.
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Richo Cech –
you hit “waitlist” on the item desired. it is a green button.
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Rose –
How might this do in Hawaii at 1200 feet? I’ve been told it’s not cold enough. No frost but temps in the low 50s during the winter. Sometimes 40s.
I have areas of natural shade and open areas, also not very good soil unless I build it up and fertilize heavily.
We can grow wetland taro here and just let the rain fill up the bed and drain out naturally. I was hoping this might work for wasabi too.
Please let me know if it might be worth experimenting, and I’ll put my name on the waitlist. thanks
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Richo Cech –
Hi Rose, I have had other hawaii-based growers tell me its working for them. The best microclimate for wasabi is a moderate-temperatured maritime fog. The best substrate is very fast-draining. There are some youtubes on the subject you can probably find like i did. one lady was growing very successfully in river gravel. richo
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Question
Thiraj Wegala –
Hello, I’d like to purchase some wasabi seeds, but the quoted shipping cost to Sri Lanka is way too high, is there a cheaper option?
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Richo Cech –
Hello Thiraj,
Thanks for getting in touch. You would be so very lucky to get wasabi seeds in shri lanka! We are responsible for providing viable seeds and we are not responsible for the cost of shipping half way across the world.
Richo
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Julian –
Hi, I was wondering if you’re able to ship to Australia Richo?
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Richo Cech –
Hi Julian, I am sorry to report that after 3 decades of successful shipping to Australia, due to current unreliable handling of our seeds in customs, we are no longer attempting shipments to AUS or NZ. Richo
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Thiraj –
Hi, I’ve read that wasabi seeds don’t last long outside, so if I purchase now, do you have viable (new) seeds in stock? The stuff needs to be shipped to Sri Lanka, so the fresher the better! Thanks very much.
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Richo Cech –
hello thiraj,
We are selling refrigerated seed from the new harvest. I wouldn’t have this in stock if it wasn’t viable–it works just fine! yes, you can read all sorts of things on the internet, it makes sense to work with honest suppliers who actually grow the seeds. I cannot guarantee seeds to arrive in sri lanka–but you can try! Richo
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Jacob –
Hello, do you ship to Czech Republic? I would love to plant my own wasabi seeds!
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Richo Cech –
Hi Jacob, Ajoy! Very sorry, we cannot ship to any country in the EU. Richo
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Question
Ken –
Can you deliver goods to Thailand?
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Richo Cech –
If you can successfully order, we will send you the seeds, and we cannot guarantee receipt.
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Fred –
Would you shop to Brazil?
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Richo Cech –
Hi Fred,
Brazilian biosecurity will not allow it,
Richo
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mk –
would u able to send to Malaysia and what will you be labelling in the package as?
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Richo Cech –
Hello MK, If you can order, we will send the seeds, and we do not guarantee receipt. Yes, we are sending them above board, labeled as seeds for customs purposes. Richo
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Steele –
Hi, I’m in Canada. Have you ever shipped to Canada before? I wanted to try and grow some plants inside for fun. But sometimes shipping laws are weird so i was just curious. Thanks in advance.
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Richo Cech –
hi steele, we do ship to canada although we can’t guarantee receipt. probably wasabi would not be a good choice, given that it really requires a mild winter outdoor treatment to sprout. richo
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Question
Rien Schilperoord –
Dear Richo,
I would like to purchase your wasabi seeds, is it possible to ship them to the Netherlands?
Thanks in advance!
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Richo Cech –
Hello Rien, For almost 2 years now we’ve been disallowed from shipping seeds to any country in the EU. Richo
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fomaco –
Good Morning~~~
I hope to your wasabi seeds. Can you deliver to Thailand?
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Richo Cech –
Hello! I do not think Thailand is specifically disallowed–you can try to make the order and if it works we will send the seeds. Here’s our updated policy from our website:
As of 3/25/2021 and ongoing, international seed orders including Canada are made at buyer’s own risk. We cannot guarantee delivery and in the case of non-delivery there will be no refunds or re-sends. We will receive and ship orders as always, but cannot account for the actions of foreign customs or Ag., which is the reason for this non-guarantee.
International orders (no live roots or plants) are shipped via AIR MAIL only and we do not provide phytosanitary certificates. Due to new, extremely stringent regulations, we cannot successfully ship seeds to: The EU, Montenegro or Scandinavia, the UK, Australia, New Zealand, Arabia, Mexico, Central and South America or Africa. We still ship with some success to: Canada, Asia, and European countries not in the EU.
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Levu –
Can you send to Vietnam?
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Richo Cech –
not successfully
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Question
Kumi –
Hello, do you send to Mexico?
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Richo Cech –
Hello Kumi, We cannot successfully ship anything to Mexico. richo
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Anton –
Hey! Do u ship to sweden?
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Richo Cech –
Due to recent laws, we can no longer ship successfully to any country in the EU.
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Question
Karen –
What is the germination rate
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Richo Cech –
cut test shows 99%
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Akeem –
Can you ship to bermuda
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Richo Cech –
probably not successfully
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Richo Cech –
hi michael, as far as i know the seed must be planted in outdoor conditions in order to sprout. It takes about 5 months. we planted seeds in october and they germinated in march. richo
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Question
Sarah Sharpe –
Heat? All the comments are about the cold but where I live it’s June 14th and already 97 degrees with 80% humidity. And that’s normal. We did have a historically low freeze this year but usually it’s cold enough to snow only a few times a year. Would they do ok in the shade of large magnolia trees maybe? Also the soil is very acid, which is still rather foreign to me as I lived for 50 years where it’s very alkaline. Azaleas love it but most needs a little lime.
Would they do well outside?
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Richo Cech –
Hello Sarah,
Lets back up a bit. Wasabi makes its seeds in the spring and needs to be planted as soon as possible after the seeds are ripe. Thats why we’re distributing the fresh seeds now–it is both timely and necessary. If you don’t have a shade-planting setup then it is not a good idea to get the seeds. The only really good way to proceed with them is to plant in a deep flat in the shade, with a screen over the top to keep out mice, and keep the flat moist until germination, which occurs usually the following late winter. That is how one proceeds to get wasabi plants out of wasabi seeds. Once the seedlings attain their second set of true leaves, they can be transplanted out to a rich, moist bed in the shade. Acidic soil is fine. Richo
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Colleen –
Hi, I have a question somewhat along those lines–I live in zone 10 and while I can do a shade setup as described, we don’t really get much of a “winter” here (a few weeks with lows in the 40s and highs in the 60s is pretty much it). How many chill hours do these need for germination (or is it daylength that triggers germination)? Thanks very much.
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Richo Cech –
Hi Colleen,
I checked my records and most of my plantings have been started in July to August and germinate in February to March. I don’t think you get enough cold days in a Z 10 to effectively plant this seed in outdoor conditions. You could give 2 months cold, moist refrigeration and then sow cool and shaded. Richo
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Question
Peggy Autio –
Is it possible to grow this as a houseplant? I grow in zone 3 so outside isn’t an option.
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Richo Cech –
Hi Peggy,
I recommend trying the wasabi. I have many of them in my greenhouse now–they like minimal light and frequent watering so they can be grown as a houseplant and are quite handsome as such.
Richo
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Fred –
Please, would you send it to Brazil and declare it as a gift (discreetly packaged)? When will the seeds became available? Thanks
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Richo Cech –
I am sorry, we’ve given up on Brazil. Even discreetly packaged goods are opened at customs and a little biosecurity pamphlet is sent back to us.
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Question
Tiago –
Olá, tem disponível, envia para o Brasil?
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Richo Cech –
Desculpe, não disponível, sementes não podem ser enviadas para o Brasil.
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Vince Sylvester –
My Wasabi from seed are doing great. Thanks Richo for all your help!
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Antonio Varone –
can you send to switzerland?
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Richo Cech –
Hello Antonio, We wish we could. International shipments are almost never successful these days. Richo
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Hien Hoang –
Did you start the seed in the little pot first?
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Richo Cech –
Hello Hien, Actually I did not. The seed is best started in a row in a deep flat. This helps regulate moisture in the substrate and is a more natural condition for germination. Richo
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Abdallah (verified owner) –
Beautiful! How long did it take for the seeds to emerge?
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Richo Cech –
hello Abdallah, yes, this info is right in the monograph– 8 months.
Richo
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Tien Cuong Nguyen –
Hi Dear,
May I the available time in 2021.
Can you send me an email when it available again?
Can you ship the seed to Vietnam and can it survive?
Thank you
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Richo Cech –
yes, please hit “waitlist” to receive an e-mail when the new crop is ready. Vietnam is a long shot but it is not specifically disallowed. r
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pedro rosario –
Boa tarde, para comprar sementes wasaby como proceder
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Richo Cech –
Portugal está na UE – não podemos enviar sementes para lá. sinto muito.
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Admin Richo Cech –
Hello Mike, Yes, seeds are produced round-about April. We will enable purchase when we see the pods forming. Plants are in 4 inch pots and have currently made many smaller leaves around the crown, which is what they do in the autumn. The front and center photo online is meant to be representative of the actual plant we sell. During the summer, the same plants were 18 inches tall. Plants vary in size according to the season, we aim to provide a plant that will work well for you, which to the nurseryperson translates to: a vigorous root. Richo
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