the controversial castor bean plant

Ricinus communis, the castor bean/oil plant, is the freshest sight in this late-summer garden. Unlike the rest of us, the swampy heat of late August only improves its looks. The tree-like mother plant, a ‘New Zealand Purple,’ lived through our typically frostless winter, just as ricinus infamously naturalizes all over Southern California. By early summer it’s 6-foot presence had become woody and gawky, and to add to its aura of unwholesomeness, it had become beloved as a perch by evil-eyed grasshoppers. It was kept mainly as a support for some tweedia vining up its trunk. I finally pulled it out in July, when its sparsely leaved hideousness was too much to ignore, but of course seedlings keep popping up, just as they have been doing since early spring.

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In early August I let a few seedlings remain, and I’m very glad I did. The new growth is fresh and lush and everything the year-old mother plant was not. Like other tropicals, they’ve grown fast in the heat of August, several feet in a few weeks, especially those seedlings left to grow in situ. I’ve transplanted a few around the garden that are much slower to throw those big palmate leaves.

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Watching these castor bean plants grow lush and beet red this August nevertheless prompts a string of ambivalent musings. Yes, it’s beautiful, but it’s also a local pest that’s escaped cultivation. In my small, walled garden, the large seeds aren’t going anywhere, but then there’s always its sinister, non-garden applications to seize the imagination. It gets a chapter of its own in Amy Stewart’s Wicked Plants, and by now we all know (or should know!) of the highly toxic and potentially lethal properties of its seeds. But processed correctly, the oil has long had many uses, both industrial and, however misguided, medicinal. In fact, it was castor oil that I mistakenly believed I had been given as a child. With vague memories stirred by these plants, I was all set to harangue my mom, who’s out of town for a couple weeks, on the still sensitive topic of childhood nutritional supplements in the form of castor oil, when I realized with a little research, and confirmed by a quick phone call, that it was tablespoons of cod liver oil she was giving us as kids, always accompanied by a couple saltine crackers to soak up the goo. Eventually, mercifully, we were given the cod fish oil in chewable tablets.


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Cod liver oil was yucky enough, but castor oil would have been an entirely different level of “taking your medicine.” Castor oil, too, had its heyday as a folk remedy and alleged nutritional supplement for children. As far as any real nutritional value, castor oil, unlike cod liver oil, offers none, but its infamous laxative properties made it an effective threat of punishment. And apart from its many industrial uses, it’s also been used as a form of torture: Wikipedia: “In Fascist Italy under the regime of Benito Mussolini…political dissidents were force-fed large quantities of castor oil by Fascist squads.”


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That’s a lot of baggage for any plant to carry.

Ricinus communis, the castor oil plant, a member of the euphorbiaceae. If you didn’t make late summer seem as fresh as spring again, we wouldn’t even be having this discussion.

I’m linking this post to Loree’s blog Danger Garden, where other favorite plants are discussed weekly.

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7 Responses to the controversial castor bean plant

  1. Linda says:

    My German Grandmother was always shoveling cod liver oil or was it …caster oil down our throats !

  2. Sue says:

    Love love love this plant! It’s an annual here of course but I have had a few volunteers appear in the a spot in the garden two years after the original plant. Just this morning I was admiring my 10 foot monster from the safety of the screen porch.

  3. All the beautiful photos I’m seeing of this plant have wanting to try it again here. I had the misfortune of trying to grow it twice, both years record cold and wet, this year and last would have been perfect (and yes sadly the plant gifted from you succumbed to spring cold…I didn’t adequately factor in the change for it coming to Portland from SoCal). Dare I try it next year year? We shall see…

  4. Kris P says:

    On my last visit to the nursery, I stared at a castor bean seed packet for 5 minutes before putting it back, once again, in the display stand. I love the leaves and the stature of the plant in the garden but its deadly side always makes me nervous (and that was before I heard of its association with Nazis!).

  5. I really love this plant and always have one or two in the tropical border. I am always amazed that the six inch seedlings turn into eight foot monsters in just a couple months. My plant this year has mucho seed heads on it so hopefully will sow around for next year.

  6. Denise says:

    @Linda, I did ask my mom about the cod liver oil, of which I have VIVID memories, and she didn’t recall giving it to us. She DID however recall her father giving it to her…
    @Sue, mine are runts compared to 10 feet! I’m enjoying these young plants so much I doubt I’ll leave any to overwinter again.
    @Loree, I should send seeds instead of plants. I’ll see if I can get some seed from these babies.
    @Kris, unless you have small kids or animals that might get too inquisitive, I say go for it.
    @Deanne, isn’t it gratifying when plants love the dog days of summer? And this one isn’t much of a water hog for a tropical.

  7. Pam/Digging says:

    How I wanted to have castor bean foliage in my garden this summer, but the deer ate my seedlings to nubs. I keep wondering if they get high on it, or sick, but since they keep on eating the new leaves, it must not be a problem.

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