About Cultivariable

Welcome to Cultivariable!  My name is William Whitson and I breed plants.  Cultivariable is my business, where I sell the plants that I breed and, miraculously, seem to be making a living at it.  I breed plants for fun, because I am interested in discovering the possibilities.  I’m not changing the world here.  My discoveries are not going to feed the starving masses, save us from climate change, or expand the frontiers of science, but they might feed you if you grow them.  This is mostly a one-man show, meaning that I do everything from weeding to stuffing envelopes alongside the actual breeding work.

I don’t select new varieties because they are objective improvements on what already dominates the market.  That is certainly fine if it happens, but I select varieties because I think they’re neat.  If you want a great, big, round, white potato, go to the grocery store.  If you want a small, oddly-shaped potato in a range of pretty colors and different flavors, you’re in the right place.  If you think that you would like to breed a weird and wonderful vegetable of your own, you are also in good company.  In addition to my varieties, I offer genetically diverse seeds that you can use in your own breeding projects and provide a lot of information about the crops that I work with.

My breeding work is conventional, meaning that I am not doing genetic engineering (GMOs).  I don’t really have anything against genetic engineering, but it isn’t something that I could realistically do, even if I wanted to.  Most of what I do is just hand pollination between chosen varieties and selection of the best resulting progeny.  This is really no different than what Luther Burbank was up to more than a century ago, though perhaps better informed by the great bulk of science produced in that time.

I am mostly interested in root and tuber crops.  This wasn’t a decision, but more of an evolutionary process.  It turns out that root crops do a lot better in my climate than most things, so more of my root vegetable breeding projects survived.  I also focus mostly on clonally-propagated crops.  Once again, this wasn’t intentional, but these crops require particular set of skills to manage and there is some economy in specializing in crops that share the same techniques.  I mostly work with minor crops that are not commonly grown in this country and that have limitations that require breeding work to overcome.  I spend most of my time on five crops: ulluco (Ullucus tuberosus), mashua (Tropaeolum tuberosum), yacon (Smallanthus sonchifolius), oca (Oxalis tuberosa), and Andean potato (Solanum tuberosum subsp. andigenum), but I am working at least aspirationally with about thirty species.

Most of what I am doing is experimental.  I am not breeding varieties to be grown on large acreage.  I am mostly breeding varieties for home growers and small market gardeners.  Most of the crops that I work with are not particularly suited to mechanical harvest.  They are typically cultivated and harvested by hand.  In the field, I grow with minimal inputs (generally just annual additions of compost) and without pesticides or herbicides.  I grow this way because I am breeding plants and subjecting them to problems like pests and weed competition helps in selecting the most resilient varieties.  Consequently, my varieties should perform well under organic conditions.

I grow hundreds of varieties, all in small quantities.  I can’t sell you a hundred pounds of seed tubers or even ten pounds in most cases.  My goal is not to supply farm-scale plantings.  I serve more as a sort of private gene bank.  Most of the tubers multiply at least 10 to 1, so it only takes a year to turn a small packet into a much larger planting.  Most of my breeding work takes place on a bit more than an acre.  I have a few acres more of overflow, but that is typically more space than I need because it is only possible to pay proper attention to a certain number of plants.  For me, that number appears to be about 15,000.  Because my space and attention are limited, varieties come and go.  If you see something you like, buy it, because it may not be back next year or ever again.

Cultivariable is located on the central coast of Washington state.  The climate is dry in the summer and wet the rest of the year.  We get about three times as much rain as Seattle, most of it between October and May.  Because we are close to the ocean, freezes are usually short and we occasionally go the entire year without a hard frost.  The temperature rarely rises above 75 F (24 C) and the warmest temperatures usually happen early in the year – in May.  After that, inland heat draws in the fog and the summer tends to be cool and gray.

We have a small greenhouse and laboratory and the lab work is taking an increasing amount of my time.  In the lab, I maintain varieties in tissue culture and perform pathogen testing and cleanup, which turns out to be quite important with crops that are propagated clonally.  They accumulate viruses over time and require cleanup.  The alternative is to preserve them in tissue culture before they are ever exposed so that you always have a clean source from which to restart.  This is becoming a big part of my work, because it reduces otherwise unmanageable complexity.

That’s probably a pretty good picture. The root and tuber sales season usually begins in December and wraps up by May.  Seeds are available whenever they are in stock.  There is a lot of information on this web site, both about how the plants work and how the business does.  I recommend that you take the time to read as much as you can.  I try to answer questions proactively since I am often not that good at responding to them in a timely fashion.

Thanks for visiting!


20 thoughts on “About

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    Terrakian Dragon says:

    I received the ulluco, mashua and oca tubers and some potato seed from you folks, and I have to say that I’m glad I found you! :-) Many of the tubers were already forming buds when I got them, so I must have just got in under the wire with my order. :-p Pity I missed out on the yacon and the grab-bag of ulluco- somebody snagged the last of those before I could, the lucky dog.

    I’m looking forward to growing these veggies in my attempt at a self-sufficiency garden. I’m hoping the massive storm that sat and blew the heck out of us for the last four days won’t ruin my tubers’ chances. (crosses fingers)

    Thanks again for providing these rarities!

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      bill says:

      TD, thanks for letting us know that everything arrived safely. Check in around November for anything you missed. We are going to have at least three times as many varieties for next year and we are growing a lot more yacon to meet demand. We tend to send sprouting tubers to locations that are already suitable for planting. That doesn’t mean that you have to plant right away though. You could easily go another month before planting or you can pot them up to grow a little bit before transplanting them. I think your storm can only help. All of these crops like plenty of water. Good luck!

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    elsie4444 says:

    Have grown this special tuber x 24 years; my Anna hummers love the bright flowers each fall. Lost all (hundreds) of my tubers last winter. Reordered 3 (sad-looking nonviable ones) from another well known company. Sadly never grew. Hoping to give the birds their gourmet treat this fall if possible. A Seattle Urban Farmer

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    Susan Rodiek says:

    Glad to find this amazing project. I was so impressed with the excess dahlia “tubers” after thinning, and just wanted to know if they were edible. I appreciate the detailed information on so many different uncommon edible plants!

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    Branden Harder says:

    Will you please give some justification for being anti-GMO? As far as I’ve been able to tell, it’s along the same lines as believing in the flat earth or that vaccinations cause autism. Given the quality of the growing guides and blog posts I’ve seen here, I really don’t want to believe that you people could be so anti-science.

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      bill says:

      I’m not anti-GMO. I’m not exactly pro-GMO either. Saying that our work is non-GMO is not an ideological statement, just a factual one. I get a surprisingly large amount of email asking which of our products are genetically modified or making assumptions that they must be, so it saves some time for me to broadcast the very straightforward answer that all of my breeding is conventional. Philosophically, I occupy the ideologically impure middle ground. I am in favor of genetic engineering as a plant breeding tool. I am also generally unimpressed with most of what has been accomplished with it so far. I don’t expect that situation to continue indefinitely though. We will learn by using the technology as with any other and I expect the applications to get better as we learn. If it were within my capabilities, I would definitely investigate GE to solve certain kinds of problems, like photoperiod or male sterility, for example. It is not a real temptation for me because GE is just not practical on my scale. If it ever comes within my reach, then it will be an interesting negotiation with our customers to discover what they would be willing to accept.

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    johanne paquet sioui says:

    Sir Whitson,
    I am a native farmer from Wendake, Quebec province in Canada (the reserve is in Quebec city). My language is French, English is my second. I have a project with yacon. From my reserches in Canada, USA, Peru I discover your site. It has many information than I could not find any where. I would like to know if you are agree to discuss with you by e-mail or skype about my project. As, I would like to know witch kind of variety my yacons are, and how far North parallele they can be cultivated.
    Sincerely Johanne Paquet Sioui

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    Charles Schauberger says:

    I just found your website and will enjoy your podcasts later. What do you know about Apios americana (ground nut). I can’t put a spade in my ground without hitting a tuber of it. I wonder if you know of anyone developing a larger-sized tuber. Mine never seem to be greater than an inch or so in diameter.

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    Linda L says:

    Hello William! I’m very pleased to have come across your blog (linked form Permies.org). Your project sounds very impressive: the dedication, curiosity, meticulousness and creativity. Wishing you all the best from southern Mexico!

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    Christine says:

    Went on a search to find out what the green berries were on my potatoes and found your wonderful site! Thanks for all the great info and your kind and thoughtful answers to all questions posed to you.

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    Ellen Zachos says:

    Thank you for your article about hopniss! It’s one of my favorite tubers, but I made the mistake (on my 3rd or 4th time eating it) of using it in a quick hashbrown and the results were enough to keep me from trying it again for a long time. I haven’t found many people who write about this aspect of the plant, and I was glad to find someone with a similar experience. Like you, I have returned to the hopniss fold, but I now cook my tubers much longer. Since moving to NM, I haven’t been able to forage for them, although I do collect some when I get back east. I’m going to go through your site now to see if I can order some to grow here, with irrigation, of course!

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    havinfunluvin says:

    I am so happy I found your site! I have been growing fruit, herbs, and edible flowers for myself and for fun. I learned from you that there are dahlias which grow potatoes. I am growing a Amorphophallus titanum (corpse flower) just to see if I can get it to bloom and it has edible tubers. There are other breeds that don’t take as long as this one. Now I’ll grow edible dahlias! I’m very happy you exist and hope you have many more years of selling to us. I enjoyed reading my first newsletter from you and look forward to more.

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