The Hunt for the Brittle Prickly Pear
The Hunt for the Brittle Prickly Pear
H. Bradford
8/26/20
Although it may not seem like the ideal habitat for cacti, Minnesota is actually home to three native species of cactus: the Plains Prickly Pear, the Brittle Prickly Pear, and the Purple Ball Cactus. The Brittle Prickly Pear or Opuntia fragilis, which ranges into northern Alberta, just four degrees from the Arctic circle, is the northernmost cactus in the world. These northerly cacti have several adaptations which allow them to survive extreme conditions. Although they flower and produce fruit, they can also reproduce from pads that have detached from the plant. In the winter, they shrivel up to avoid freeze damage. They can tolerate a variety of soils and are fire tolerant, as long as their roots survive. Prickly pears in general photosynthesize at night to avoid loss of water. These tough cacti can withstand a temperate range between -58 F and 131 F. Since I knew that this cactus could be found at Quarry Park in St. Cloud, which isn’t too far from where my brother lives, I was determined that this summer I would find this cacti.
The first attempt to find the Brittle Prickly Pear was this past June. My brother and I spent over three hours at Quarry Park in St. Cloud searching the rocky outcrops for the cactus. Perhaps part of the problem was that I expected it to be larger. I have seen prickly pears before, and they are usually somewhat large plants with pads the size of my hands. When blooming, they have large yellow flowers. The Brittle Prickly Pear is remarkably small. The pads are about two inches tall and a half of an inch to an inch wide. They grow in small clusters on bare, southern facing rocks. While they tolerate many conditions, they do not tolerate shade, so they will not survive where they are crowded or shaded by other plants. The area which we focused on the most was the State Scientific and Natural Area. This seemed like the most obvious place, since it featured a sign with information on the Brittle Prickly Pear. We scoured the rocks, but found nothing. This isn’t to say that there are no Brittle Prickly Pear in the SNA, but we were not successful in this area. Even though we didn’t find any cacti, we had a nice hike and even got yelled at by a man who looked like Santa Claus for talking too loudly out on the far end of the SNA (where we hadn’t seen any hikers for at least an hour).
My brother and I visited Quarry Park again in mid-August. This second visit was cut short when I suddenly got a fever and had to turn around on the hike. The cactus hunt turned into a Covid-19 scare that sent me back home. I was quite disappointed that I had to abandon the quest, but my brother cheered me up by painting me a prickly pear portrait.
A week later, after my Covid-19 test came back negative, I visited my brother again. For this third attempt to find the cactus, I prepared myself for the hunt by wearing a cactus shirt, mask, and earrings. Clearly this outfit helped, as this time we were successful early in our hike. We once again headed towards the SNA, but along the way my brother saw a trail which said, “Do Not Enter” or “Wrong Way.” I believe that this was near number 11 on the map. He thought we should enter anyway, which we did. We came upon some rocks and I found a tiny cactus the size of my pinky lying on its side on a bed of moss. I found a cactus! A tiny, uprooted cactus. A few feet away at the south end of these rocks were several other patches of small cacti. We took many photos of our discovery, feeling very satisfied that we finally found the cacti. They were much smaller than I had imagined them. In a way, it is easy to understand how such tiny cacti survive against the harsh winters. The are small, keeping close to the warmth of the rocks and insulating moss. These ones don’t appear to fruit or flower, struggling at the very edge of cacti survival. And, while this guide is not precise because I don’t have a good memory of the layout of the park, hopefully this helps others find them as well. As another clue, the spot where the cacti were located was near a quarry pond with trout on a trail which lead onward to the SNA. I hope, of course, that no one digs up or destroys these cactuses. They are not protected in Minnesota, but they are in other states and it would be nice to keep a healthy population of these unique plants.
Quarry Park is just one area where these cacti can be found. Some of the places where Brittle Prickly Pear are known to grow include Jeffer’s Petroglyphs, Pipestone National Monument, Blue Mounds State Park, Sherburne National Wildlife Refuge, granite outcrops around St. Cloud, rock outcrops of Big Stone County, and southern sloping rocky outcrops at Rainy Lake near Canada. Having found one species of cactus in Minnesota, I hope to one day find the others as well. The Purple Ball Cactus is considered endangered in Minnesota, but can be found in Big Stone Wildlife Refuge and its populations outside of the refuge has been threatened by granite quarrying. The Plains Prickly Pear is more common, but still rare in that it is confined to the south western parts of the state. Blue Mounds State Park seems like a great destination to see both the Plains Prickly Pear and Brittle Prickly Pear. In any event, my brother and I were elated to find the prickly pear on our third attempt and I look forward to future cacti adventures.
A few sources:
https://www.minnesotawildflowers.info/flower/brittle-prickly-pear
Click to access 2012%20CSSJ%20Minnesota.pdf
https://www.fs.fed.us/database/feis/plants/cactus/opufra/all.html