Weed of the Week

If ProfessorRoush can endorse the prairie's choice of a "Plant of the Week," he can also surely endorse a "Weed of the Week," although this one was selected not through the collective wisdom and brutal natural selection processes of the prairie, but at the hand of the less-demanding and less-discerning Mrs. ProfessorRoush.  Isn't it just wonderful how these blog entries sometimes seem to write themselves?

You see, Mrs. ProfessorRoush texted me with a picture of this plant last Saturday afternoon while I was on the lawn-mower, busily engaged in my weekly Saturday work chores.  She had found it while taking Bella for a walk down the road and although it takes an exceptional floral display to attract her attention, this plant had "understood the instructions," as the "fly" youngsters say.  Mrs. ProfessorRoush wanted me to identify the plant for her and although her "snap" was a less focused and composed photo than the photograph above, I was happy to immediately fulfill her expectation of my omniscience in regards to plant identification and simply texted back this weblink:  https://kswildflower.org/flower_details.php?flowerID=90, thus temporarily meeting her minimal expectations of my usefulness.   As women in general, and especially Mrs. ProfessorRoush, are often left less-than-impressed by my prowess in this and many other areas, I then said a quick prayer of thanks to the benevolent floral gods before resuming mowing.

While it can put on an impressive floral display in June and July, Crownvetch or Purple Crown Vetch (classified as Coronilla varia or Securigera varia, as there is some current dispute over the taxonomy) is certainly an invasive foreign species here on the Kansas prairie and my placement of it into the "weed" category is not just a literary liberty.   This leguminous vine, a native of Africa, Asia and Europe, is planted for erosion control and roadside plantings due to its aggressive nature, deep interwoven root system and drought-resistant leaves, and it has now naturalized in most of these continental US states.  As a veterinarian, I'm also aware that while it provides a valuable protein-rich feed source for ruminants, its high nitroglycoside content makes it toxic for horses and other non-ruminants, so its invasive nature is a threat to more than just neighboring plants struggling to compete for light, space and water.

For the time-being, clumps of Crownvetch are blooming nearly everywhere on the prairie in my vicinity, pleasing less-discriminating plant connoisseurs such as Mrs. ProfessorRoush and vexing those like me whose sense of natural balance is disturbed by nonnative plant species in our landscapes.   I must concede that it provides a colorful and pleasing display, although the hue, while predominantly light pink, is just a little too purple for my unequivocal liking.   Happily, although Crownvetch loves disturbed soil, this is not a weed that requires considerable time to keep out of my garden beds, so I can stay silent and allow Mrs. ProfessorRoush her appreciation and enjoyment of it along the roadsides and cow pastures of our local prairie, all while I bask in her justified admiration of me as her personal plant encyclopedia.