How to identify and forage Texas wild mustard: bastard cabbage

Latin name: Rapistrum rugosum
Common names: Bastard cabbage, turnipweed, turnip weed, giant mustard
Season: Spring and early summer
Edible: Yes, entire above-ground plant
Flavor: Good to great
Nutritional: Yes, vitamins K, A, C, E and all the Bs, also copper and iron

Identification difficulty: Novice

Rapistrum rugosum, most commonly know as bastard cabbage, and less commonly as giant mustard, turnipweed or turnip weed, seems to be nothing more than a tall, cheerful yellow wildflower that paints Texas in swaths of color. 

But looks can be deceiving. 

Bastard cabbage is a wild mustard, (cabbage is in the mustard family), that gets it's common name from its highly invasive nature. Originally from Southern Europe, the Mediterranean and Northern Africa, bastard cabbage has spread to 17 U.S. states and has hit Texas particularly hard. 

Bastard cabbage has a deep, deep taproot that makes it hard to "root" out, (ha, ha, ha), and a habit of being one of the first things to flower in the spring, getting well-established before native plants can get a foothold. Indeed, it's rapidly displacing native wild flowers, like bluebonnets.

It's also edible and quite tasty when prepared correctly. So let's take a moment to get to know this invasive weed, you you too can try it!

Bastard cabbage identification 

Special note: Bastard cabbage is relatively easy to identify once its flowering, but can be more challenging before that. I recommend not harvesting this plant before flowering unless you have become fairly familiar with it, or are familiar with foraging mustards in general. 

After construction of apartment complexes, there are often
fields of bastard cabbage, which spring up in disturbed soil.

Location and season

One reason why bastard cabbage is so invasive is because it's one of the earliest greens we will see pop up in the season, usually by the first week of March hear in Texas. It gets a head-start on many native plants. 

Trails are another common place to find bastard cabbage.
Note the height and size of the mature plants.

Additionally, this is a ruderal species. That means that it's one of the first plants to get established if the ground is disturbed. In purely natural areas, disturbed ground is most common around creeks and in flood plains. But humans frequently disturb the ground for construction, road work, creating trails and pathways, in fields for seasonal farming, and for many other reasons. These are all good places to look for bastard cabbage--though don't eat it from near a highway or any other potentially contaminated area. It can also grow in and around trees that would usually provide too much shade for other plants, as bastard cabbage gets established before the trees leaf out.  

Plant size and shape

Bastard cabbage begins as a basal rosette, or a circular mat of leaves coming out from a central point, flat against the ground. Very quickly those leaves start to build up, creating a "fluffy" circle. 

When mature, plants will reach around 3' at the very tips of their flower stalks. They will be quite leafy for about 2/3 of their height, then be almost bare branches with just tiny leaves and flowers. The diameter of the leafy base will be between 1' and 2 1/2'. 

4-petaled yellow flowers in oval-shaped clusters

Flowers and fruits

The flowers are the most distinctive part of bastard cabbage, and I recommend not foraging them until they flower, at least not until you are quite familiar with the plant. 

Flowers are around 1/3 to 1/2 inch, bright yellow, have 4 petals in a cross shape. They grow at the ends of the central stalk or the ends of side branches in oval-shaped clusters.

Flowers appear by mid-spring (late March/early April in Texas) and the plant will generally be done flowering by late spring (May here in Texas). 

The flowers leave behind small, teardrop-shaped fruits, the size of a pencil lead, which will cling to the stalk until they ripen in to seeds. 

Stalk and branches

The stalk for bastard cabbage is light green and looks like it has textural striations along it. There aren't any red spots, though right before the plant bolts, the junction between the baby branches and the main stalk might look a little reddish or orangish. 

Right before the plant bolts the main stalk will have a green flower bud, and the baby branches will also have tiny buds (see the area circled in red). The stalk will be about 1/4" in diameter at this point. 

The branches are never directly opposite each other, they are always slightly offset vertically. But they will always alternate which side of the stalk they come off of. 

When the plant bolts (begins its reproductive phase), the central stalk will shoot up about a foot taller than the leafy base. The green buds will turn into yellow flowers, and the baby branches will grow out, making the whole plant multi-branched. 

When mature, the stalk will thicken to 1/2" or 3/4" in diameter and become a brighter, almost lime green. The branches can be grow to be 1/2" thick. 

Incredible variation in mature leaf shape, size, number of lobes, lobe size, and edge texture. 

Leaves

Bastard cabbage has some frustratingly complicated leaves. At the base of the plant and in the basal rosette, leaves will be quite large, from 8" to 12" long. They are often dark green and very wrinkly, but can also be medium green and unwrinkled. They have a long central mid-rib that is light green or white. 

The mature leaves are always deeply lobed, but sometimes those lobes can be more or less even in size and there can be many of them (above right), other times they can appear more as a spoon shape--with one giant lobe at the end of a long leaf stalk, with only tiny, barely noticeable lobes running along the stalk (above left). 

Just like leaf shapes, leaf edges also vary greatly. Edges will be scalloped, small toothed, large toothed (like a saw blade), wavy or even nearly smooth, though never fully smooth. 

To make things even more complicated, many of the smaller leaves near the top of the plant will be triangular or lanceolate and may or may not have any lobes. 

This is why it's important to use more features than just leaf shape at first. 

Many, but not all, mature leaves will have textural bumps.

Bastard cabbage plants will always have several leaves that are covered in tiny, textural bumps. But not EVERY leaf will have this feature. They are more common on mature leaves, and may be significantly less obvious than on the example above. 

Garlicy bastard cabbage flower buds and stalks - Italian style

Ok spring in Texas has been quite delayed this year due to reoccurring cold spells throughout the mid-to-late winter. December was comfortably mild, but January and February saw short but deep chills every week or two. As a result, we are about three weeks behind where we usually are in the foraging season. And it's been quite frustrating for me. 

Usually at this time I would have an abundance of pokeweed, wild garlics, cleavers, chickweed, dock, thistles. mustards, and more. Henbit and deadnettle, often found in February, are just now starting to peak.

The perfect stage for harvesting flower stalks and buds,
Make sure to break the stalk at a natural snapping point.

But if there is one good thing about the delayed season, it's that its forcing me to look outside of my comfort zone to find plants to forage. Bastard cabbage, Rapistrum rugosum, is a highly invasive mustard species which is found in abundance in Texas, though often sprayed and therefor not safe for consumption. 

While generally not highly regarded as a food source, I've found it to be utterly delicious when properly prepared. The secret is in the hairs all over the plant, which can be unpleasant in texture, but are softened by blanching. Blanching also brings out a mellow sweetness, and overall R. rugosum is perhaps my favorite wild mustard, with a flavor combining brocollini, sweet corn and asparagus with a very mild mustard spiciness. It's truly delicious. 

Though I've cooked extensively with the mature leaves of the bastard cabbage plant, this week was my first stab at using the tender young flower stalks and flower buds. Foraging author Sam Thayer describes this as his favorite part of the garlic mustard plant (Alliaria petiolata), also in the mustard family. I've tried garlic mustard that way, and was not impressed. But bastard cabbage was another story. 

From my husband, "This is one of the best wild plants we've tried." And I have to agree with him. 

Right now R. rugosum looks pretty much like the picture above, leaves are smallish, and generally the plants aren't flowering, though they have formed buds. You are going for the central and side stalks, with the very smallest leaves attached and the flower buds at the ends. You want to feel down the stalks until you find the area where it breaks off easily. If it doesn't break easily, and only bends, then that stalk is too mature and will be woody. Generally speaking, once most of the buds are in flower, they will be too tough and woody. 

Once the buds have flowered, the stalks are generally
tough and woody

Once picked, the buds and stalks strongly resemble rapini/broccoli rabe or broccolini/baby broccoli. Broccoli rabe is a favorite in Mediterranean and Italian cuisine, and broccolini is most often eaten in Japan and other Eastern countries. Both are usually given simple seasoning and then sautéed or stir-fried briefly, over very high heat. 

I decided to try a classic Italian preparation here, modified with the addition of a quick blanch, and ended up with an excellent, 3-ingredient side dish that took only around 10 minutes to prepare. 

Italian-style garlicy bastard cabbage flower buds and stalks

Serves 2-3 as a side dish

2 cups of bastard cabbage buds and stalks

2 cloves of garlic, sliced

3 tablespoons high-heat olive or avocado oil

Sea salt to taste

1. Bring enough water to cover the bastard cabbage buds to a rolling boil. Add in the bastard cabbage and blanch for around 2 minutes, or until the green color brightens. Drain and rinse with cold water. Shake the greens in the colander, leaving them a little damp.
2. In a large sauté pan or wok (preferred) bring the oil to high heat. Add the bastard cabbage to the pan, and sauté on high, moving the greens and the pan constantly for about 2 minutes, until the color becomes a very vivid green. 
3. Add the garlic to the pan and continue to sauté/stir-fry, moving constantly until the garlic is soft and very fragrant, about 3-4 more minutes. Remove from heat and serve immediately. 
4. 
   

This side dish is very diet restriction friendly. It's low in fat, carbohydrates and sugars, gluten-free, Keto diet-approved (mustard greens being very low in net carbs), vegetarian, vegan, and Paleo, depending on the oil you choose. 

For a very Texas meal, serve as a side to steak

Creamed wild greens with Greek yogurt: vegetarian, high-protein, low carb, low fat, gluten-free optional

Non-foragers, don't run away, although I made this dish with wild, foraged greens, you could easily make it with spinach or kale--and it would still be a healthier take on the creamed side dish.

Spring is officially ON in north Texas, and a lot of our freshest, tenderest wild greens are peeking out above the duff. But it can still be chilly, this year more than most, with temperatures in late February dipping into the 30s. And cold weather craves comfort food.

This dish makes great use of 3 invasive species: bastard cabbage (Rapistrum rugosum) a member of the mustard/cabbage family, curly dock (Rumex crispus), and this field garlic, I'm not sure which one it is, but if you get that garlic smell, it's an edible garlic.

If you don't have either of these wild greens, feel free to sub any mustard greens, lambsquarters, dandelion greens, sow thistle, spinach, kale, etc.

Bastard cabbage, Rapistrum rugosum.
All members of the cabbage/mustard family are edible,
if you can identify them properly.

Curly dock, Rumex crispus. An abundant, invasive wild edible,
available throughout North America.
I have a post on how to ID this plant, see below for more.

As yet unidentified wild garlic. It appears to be a hybrid with
invasive crow garlic, Allium vineale

One of the best things about this meal is that it can be on the table in under 20 minutes, and only uses one pot!!! So easy for cleanup as well. It makes a great side dish for grilled meat, or to help stretch out leftovers.

This dish is vegetarian, low in carbs, low in fat, low sugar, high in protein, and gluten-free optional.

Wild Food: Golumpki-Inspired Casserole with Bastard Cabbage

During the foraging season, I like to eat something wildcrafted every day. The best way to make this happen is large dishes cooked up once or twice a week, and heated for leftovers as lunches and rush-night dinners. And casseroles are great for this.

Golumpki, or golabki, are a Polish dish of meat and rice, wrapped in cabbage and cooked in tomato sauce. Many cultures have similar dishes; I've had the Iranian version with mint and lamb, and there are others. Though simple in concept, all the wrapping is rather labor-intensive. And the oddly shaped, deeply lobed leaves of bastard cabbage would never work for wrapping. So by doing a deconstructed golumpki casserole, it's much easier and comes together much quicker.

Bastard cabbage is everywhere in Texas right now, covering entire fields, and vacant lots, like this one.

Foraging Recipe: Bastard Cabbage Chana Masala

So I hope you checked out my earlier post about trying bastard cabbage, Rapistrum rugosum, for the first time. Bastard cabbage also goes by the more polite names turnip weed and wild turnip, but for some reason I mostly see it called bastard cabbage.

Bastard cabbage likes open fields and disturbed
ground, like the edge of this trail

Bastard cabbage may very well be Texas's most infamous invasive weed, and so I was very anxious to try it. I'm glad I did! When blanched, it tastes like a mixture of spinach, sweet corn and a hint of pepper. Every mustard green I know is nutrient-dense, as are dark leafy greens in general, and I'm sure bastard cabbage is no exception.

I was nervous about the fuzzy/hairiness of the leaves. Don't be, blanching them takes care of the texture.

Chana masala, or chickpea and tomato curry, is an excellent dish to make after a day of hiking, as it's super easy and comes together quickly. It's also vegan, for anyone who wants to try a tasty meatless dish. Despite being technically a curry, it's much milder in flavor that most, and has a nice freshness as well. There are numerous was to prepare it, so if there's something you don't like, just leave it out, or substitute something else. There was a time in my life when I made Chana masala every week -- it's that good!

Eating Invasive Bastard Cabbage for the First Time

It's always exciting trying a new plant or mushroom for the first time, and for me, bastard cabbage (Latin name: Rapistrum rugosum) was one I wanted to add to my menu ever since my husband and I first started talking about moving to Texas.

Though it may be invasive, bastard cabbage does serve
a purpose: it provides spring forage for pollinators.
All the plants were covered in honeybees and butterflies.

Garlic mustard, Japanese knotweed, kudzu, and now bastard cabbage. . . one of the main focuses of my foraging has always been to eat as many invasive species as often as I can. Not only does it help mitigate the ecological damage of a plant, but it provides a sustainable food source.

Rapistrum rugosum, commonly known as bastard cabbage, turnip weed, or wild turnip, is a highly invasive member of the mustard family, known as Brassicaceae. This is the family that includes mustard greens, broccoli, brussle sprouts, turnips, and, you guessed it: cabbage.

It's a hearty plant from Eurasia, and it's hearty qualities are giving it the edge over local Texas wildflowers. Some fear that the famous Texas bluebonnets are in danger of extinction through competition with this invader.  Though mostly a problem in Texas, bastard cabbage is also spreading in small pockets of New Mexico, California, and Arizona.