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| With thanks to Ellin Barret who first piqued my curiosity for this post. |
Because a friend posted this meme, I was off and running. So I decided to let my fingers do the walking through Wikipedia to resolve for once, and for all, the differences between the escaped feral “wild” mustards that ravage the California landscape in spring. And yes, we do have several rather diminutive native mustard species.
What I discovered is that there was not one species, but over 30 separate species of “wild” mustard plants or brassica. And very few “wild”mustards are actually wild, they are almost all feral. Our most favored mustard species, Eurasian Brassica oleracea, that the ancient Celts and Romans were so fond of, gives us those yummy cultivars (all from the same species, like a breed), including kale, cabbage, collard greens, broccoli, cauliflower, Brussels sprouts, kohlrabi, etc.
Although some species of mustard plants were established crops in Hellenistic and Roman times, there are few archeological records. Wild forms of mustard and its relatives, the radish and turnip, found over Eurasia, suggests domestication took place in that region. However, Zohary and Hopf conclude: "Suggestions as to the origins of these plants are necessarily based on linguistic considerations." The Encyclopædia Britannica states that mustard was grown by the Indus Civilization of 2500–1700 BC. —Wiki
An Asian mustard species from the Hindu Kush, Brassica rapa, one of the first invasive field mustards to bloom in California, gives us bok choy, Napa cabbage (really Beijing cabbage!), rapini, turnips, canola oil, etc. More on native and invasive mustards here.
Highly invasive black mustard or Brassica nigra is the most common species found in California. The seeds were theoretically brought here by the Franciscan friars scattering mustard seeds as they walked from mission to mission—bits and seeds of B. nigra were found in adobe brick made in the 1700s.
Also, according to the scriptures, tiny mustard seeds were held in high regard because though the seeds may be small, their potential for growth is enormous; to enter the kingdom of heaven begins with faith. Jesus was reputed to have said:
"For truly I tell you, if you have faith the size of a mustard seed, you will say to this mountain, 'Move from here to there,' and it will move; and nothing will be impossible for you." (Matthew 17:20-21)Nearly all Brassica seem to have one thing in common, a four-petaled flower shaped like a cross, hence the name cruciferous vegetables. Even the diminutive jewelflower species of California, Nevada and the Southwest have four petals, but they are so tiny, they are nearly invisible.
And yes, we do have many diminutive native California brassica species according to iNaturalist. My personal favorites are a magenta wallflower, or rockcress, milk maids, desert candles, and the crazy stripped-down endemic jewelflowers—some species so rarified they only grow in one small patch in the world. It seems that each mountain range has its own species of jeweleeed—and most are endangered species.
And closely related to black mustard, and B. rapa, the Brassica napus or brown mustard species, aka rapeseed, also gives us canola oil, Siberian kale, and rutabagas. Originally from India, it spread to Asia and farmers diversified it by developing cultivars. It's a really popular cover crop in Ukraine along with those heliotropic North American sunflowers.
Yes, North American: Helianthus annuus—though they were first domesticated and cultivated by Native Americans 4500 years ago, they were commercialized in Russia and Ukraine. Sunflowers and mustard are important sources of vegetable oil. All that oil to fuel the world. We won’t discuss the atrocities suffered by mustard gas unleashed by the Germans at Ypres during World War I.
The ancient Romans not only invented fish sauce (of the Worcestershire persuasion), they also might have invented mustard as a condiment (the Egyptians also used mustard) by mixing ground mustard seeds with grape juice (called “must"), thus giving us the word mustard!
The word "rape" came from Latin for turnip, rāpa or rāpum, Greek word ῥάφη, rhaphe. The Romans were quite crazy for their cabbages.
Radish means root in Latin. Apparently Egyptians were noshing on radishes before the Pyramids were built. Perhaps the workers were fueled on by radishes and salt. After all, the Romans paid their workers with salt, which means salted cruciferous greens, hence the word salary.
Meanwhile, the French are still buttering and salting their radishes. Forget about that sinus cleaner, Japanese wasabi. Medieval Germans were so crazy for radishes that they grew them bigger and better. Imagine massive 100-pound radishes ravishing the countryside. Radishes, not mustard, were the first cruciferous crops introduced to the Caribbean in the 1500s.
Brassica oleracea probably came from Crete. Or it was a stowaway on Jason’s Golden Fleece. The Greeks too were so mad for radishes (which probably came from China by way of Egypt), that they made little gold radish talismans to offer up to Apollo. Why the sun god needed radishes is anyone’s guess. You’d think horses or chariots or wine would’ve been a more practical gift. Ok, I’ll stop rooting around now on Wiki.
Note bene: I never know where writing ideas will come from. It always catches me by surprise! When I was a child, I was always making equivalencies, that is relationships between things—especially plants and animals. I guess some things never change. When I finally adulted (some could clain that I am still attempting to achieve adulthood), I discovered most of my correlations were spot on.
At one point, I thought all that wild mustard was native, and it was only one species. When I joined a California naturalist group, I learned that there were more than one invasive mustard species, and that’s probably the thing that spurred me on because I cannot tell the difference between field mustard and black mustard, it’s all mustard to me.
















