Opuntia macrorhiza (Plains Prickly Pear)

Plant Info
Also known as: Twist-spine Pricklypear
Genus:Opuntia
Family:Cactaceae (Cactus)
Life cycle:perennial
Origin:native
Status:
  • State Special Concern
Habitat:part shade, sun; dry prairies
Bloom season:May - July
Plant height:2 to 12 inches
Wetland Indicator Status:none
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

Pick an image for a larger view. See the glossary for icon descriptions.

Detailed Information

Flower: Flower shape: 7+petals

[photo of flower] Flowers are showy, 2 to 3 inches across, with 7 or more yellow petals that are sometimes reddish at the base. A green ovary protrudes in the center, surrounded by numerous yellow or red stamens with yellow tips. There may be 1 to several flowers around the tip end of a pad.

Leaves and stems: Leaf type: simple

[photo of stem segments] With cacti, the spines are modified leaves and the fleshy pad segments are modified stems. Spines are up to 2½ inches long and typically straight, clustered in groups of 1 to 6, growing from numerous small projections (areoles) on the surface of the pad. The spines are not hooked but the areoles have tiny barbs (glochids) at the base of the spine cluster that easily detach and can be difficult to see, let alone remove once embedded in skin. The pads are a dull dark green to blue green, generally a flattened round, oval or egg shape, 2 to 5 inches long and 2 to 4 inches wide with a waxy surface. The segments do not easily detach from each other. Plants can form a mat up to 5 feet across.

Fruit: Fruit type: barbed Fruit type: capsule/pod

[photo of fruit] Fruit is fleshy, green to reddish, shaped like an inverted cone, 1 to 1½ inches long. Inside are numerous seeds.

Notes:

There are 2 species of prickly pear cactus native to Minnesota, one of which is Brittle Prickly Pear (Opuntia fragilis), though there is confusion and debate over the name of the second species. Some call it O. humifusa, others O. macrorhiza., and still others are unclear whether these are actually distinct and separate species. In the meantime, the DNR lists O. macrorhiza so that's what we're going with. A rose by any other name...? The flowers of the 2 natives are more or less the same. Distinguishing features are mostly the size and shape of the pads and number of spines. Brittle Prickly Pear has much smaller pads that easily detach and up to 8 spines per areole. Plains Prickly Pear is way overlooked as an interesting garden species. It will thrive in any hot summer location, from clay to sandy soils, as long as site is hot and well drained. New starts are easy—just cut off and root a year old pad, any time of year. It also germinates readily from seed though maturation period is numbers of years. I've used long handled forceps and leather gloves to get at weeds growing between the pads—dangerous work, but worth it!

Please visit our sponsors

  • Minnesota Native Plant Society

Where to buy native seed and plants ↓

Map of native plant purveyors in the upper midwest

  • Prairie Restorations - Bringing people together with the land
  • Landscape Alternatives - Distinctive Native Plants since 1986!
  • Shop for native seeds and plants at PrairieMoon.com!
  • Shooting Star Native Seeds - Native Prairie Grass and Wildflower Seeds
  • Morning Sky Greenery - Native Prairie Plants

More photos

Photos courtesy Peter M. Dziuk, taken in Renville County, along a country road in North Dakota, and in a private garden in Lino Lakes

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: Jan - Brainerd
on: 2012-02-05 17:00:39

You should put some information about minnesota plains...... not just the stuff on the plains!!!!!!!!!!!!!!!!!!!!! Duh

Posted by: K. Chayka
on: 2012-02-06 16:24:14

If you are looking for general information about the plains, there are many other resources for that kind of information. The DNR has fair amount of information about various eco-types in Minnesota. Here is a starting point: habitat descriptions

BTW, the Minnesota Wildflowers web site is designed to be a plant identification resource. We only mention the general types of habitat where a particular species may be found. This is intentional, as we aren't out to duplicate others' works, but provide info about MN plants you can't really get anywhere else. :-)

Posted by: Jeanette - Mankato
on: 2014-05-24 10:55:03

Have prickle pear cactus that has been planted off my patio for about 8 years. This winter was the first that I did not cover it. I know others in Mankato do not cover them and they do well. This year my cactus is brown and limp. Will it come out of this? We have been wet here.

Posted by: Brian - St. Peter
on: 2015-01-19 01:09:38

There's a huge, beautiful plant of this species in cultivation at the Traverse des Sioux Garden Center in St. Peter. The owner told me that it came from a sandy area at the upper western part of the valley many years ago (the area has long since been converted to other uses, so no cacti are to be found there now).

Posted by: Lisa L - Quarry Park, St. Cloud, Minnesota
on: 2016-05-29 23:03:32

I found a few patches of these cacti growing in the granite fields at Quarry Park, near St. Cloud. They were just small, spines and (leaves) grew no bigger than my thumb, but they were there! I've read that these granite fields is one of the very most northern areas they are found. Quarry Park has numerous areas of unquarried granite fields, where you can find lots of flowers, and cacti.

Posted by: Jean - BLOOMINGTON,'m.
on: 2016-06-14 16:09:53

I have one in my garden,I've had it about 4years.I don't do anything to it in the winter.It's getting really big!

Posted by: Bob M - Olmsted county
on: 2018-05-09 16:25:56

Found on a goat prairie in Chester Woods County Park.

Posted by: Ethan - Eagle Park,Rockville,MN
on: 2018-05-13 14:59:41

I found a Plains Prickly Pear on a large boulder in the prairie in Eagle Park.I only found one but this cactus was large.

Posted by: Ethan - Blue Mounds State Park
on: 2018-05-13 15:05:45

I found hundreds of cacti here,most of them were Plains Prickly Pears but some were Brittle Prickly Pears.You will find these cacti near the rock cliffs.

Posted by: Lisa LeMay - Roseville
on: 2018-07-20 08:29:35

I have them on the south side of my house and they are very happy! People are shocked to see they can grow here. Always love to see those cactus flowers blooming!

Posted by: Amy - Saint Francis
on: 2018-08-22 10:54:55

We found some Cactus in the wild on our walk today. I had no idea it grew in MN!

Posted by: Thomas - Bemidji
on: 2019-01-22 20:56:25

I'm fascinated that cactus actually grow in such climates as MN.

Posted by: Edward Sievert - Pope co
on: 2019-04-11 10:19:24

I have one in my backyard. I rooted a pad that had broken off the main plant. The main plant can be found south of Starbuck MN on a gravelly windswept glacial hill. It is at least 8' in diameter.

Posted by: Amber - Oklee
on: 2020-06-01 15:44:03

I was given some prickly pear “cuttings”!! I was lucky enough to be deemed “that one person who would love them enough, to make sure they grow”!!! I’m super excited!! Wish me luck!

Posted by: Chriss - Saint Paul not far from lake phalen
on: 2020-08-22 23:09:55

I found these growing at a local park in east maplewood mn. I was pretty astonished and emailed a pic to the u of m for info. I think next year ill find a spot in my garden and search the local nurseries and online for a reputable seller.these are beautiful.

Posted by: Nadine Froderman - Reading
on: 2021-06-16 20:14:14

Where in our area might I find one of these? I'm in Nobles county.

Post a comment

Note: All comments are moderated before posting to keep the riff-raff out. An email address is required, but will not be posted—it will only be used for information exchange between the 2 of us (if needed) and will never be given to a 3rd party without your express permission.

For info on subjects other than plant identification (gardening, invasive species control, edible plants, etc.), please check the links and invasive species pages for additional resources.



(required)




Note: Comments or information about plants outside of Minnesota and neighboring states may not be posted because Id like to keep the focus of this web site centered on Minnesota. Thanks for your understanding.