US Native Iris: A Look at Vernae, Tripetalae, Longipetalae and Laevigatae

by Robert Gabella

Iris virginica Shrevei on the banks of the Fox River - Batavia, IL

Childhood Indiscretion and Missed Opportunities

As kids, we had the freedom to wander the local woods. Mom was happy to get us out of the house, so long as we came home by dinner. If we were parked in front of the TV, she'd turn it off and say "Get outdoors, you're not going to sit at home and watch cartoons on a nice summer day!"

Dad was a career Army officer, so we had a chance to wander state after state - Texas, Alabama, Maryland, Florida, Alaska, Illinois, Colorado and anywhere we visited in between. With no cell phones, and often beyond the distance of a shout, we found our own adventures and made our own discoveries - occasionally getting into trouble. Somehow, we managed always to come home in one piece.

Iris verna Cleo Chapel Road, in the garden

The exact reason I first saw Iris (subgenus Limniris, series Vernae) verna in a dimly-lit but open wood in Southeast Alabama, several blocks from our on-base home, is up in the air. Meaning - giant woody lianas of undetermined species were literally hanging from the air, from high in the trees – so I, my brother and a friend set out to swing from them like Tarzan! During the acrobatics, I noticed little purple dots not far in the distance, even more startling with bright orange signals.

Though only 9 years old, I'd become familiar with Bearded & Beardless Iris at a prior residence in Maryland. Later, Bearded Iris grew, and rebloomed, around our school courtyard in Tallahassee, Florida. A voracious garden reader even then, I'd read about but never seen Iris (Subgenus Lophiris) cristata. But these were different, a puzzle! They varied slightly in color and form. And the need to possess overcame me. Choosing the flower I liked best, I unceremoniously (and unwisely) ripped a plant out of the ground. Surprised at the rope-like rhizome, distance between the small fans, and scarcity of actual roots - I got what I could. Transplanted into a little garden space I had, it grew for the remaining three years we lived there, but bloomed again only once.

Iris verna Cleo Chapel Road, in the garden

It took years, but I finally made a proper purchase of this gem - Darrell Probst's 2012 intro, 'Cleo Chapel Road'. Planted in my Zone 5 Chicagoland garden, it bloomed beautifully, and reconnected me to that childhood discovery! 

COLLECTORS, PLEASE NOTE:

Unless you have a state-issued collection permit, private property owner's permission, or are lucky enough to have them wild on your own land, buy nursery grown plants of Iris species, or raise them from SIGNA (Species Iris Group of North America) seed: http://www.signa.org/index.pl?Intro.

This way, you harness the beauty of native Iris without putting pressure on wild populations.

And Much Further North…

Fast forward to a move from Alabama to Alaska, and close encounters with lots of Iris (subgenus Limniris, series Tripetalae) setosa.

I. setosa, Alaska; Photo courtesy of istock.com/Micah Mabin

My first sighting was a thick clump blooming in a neighbor's garden, a gorgeous dark purple with 3 falls and no standards – could it be a Japanese, I wondered. But I learned quickly, as Mom had picked up The Alaska-Yukon Wildflower Guide. At about the same time. the Alaska Department of Transportation then put out a notice that they were giving away Iris for the digging, near Eklutna Flats, north of Anchorage, in the path of major construction. Though we took a look at them as we drove past, on the way to elsewhere, my parents (sadly for me) chose not to go through the muddy routine.

I. setosa, Alaska; Photo courtesy of Raymona Pooler/www.shutterstock.com

I. setosa, Alaska; photo courtesy of Karen Danenauer/www.shutterstock.com 

But I got my revenge almost 20 years later, with a dig permit from the Alaska Department of Natural Resources for I. setosa interior, the taller subspecies in East Central Alaska. In advance, I'd written Larry Duffy who'd collected them in a wide range of colors, from white to pink and burgundy plus the usuals. We later met in a coffee shop in Fairbanks, after my digging, and he showed me his slides. At that point I encouraged him to register them, which he did. Though I collected several forms, there was doom in their future. With my good friend, the late Florence Stout from Northern Illinois Iris Society, we planted them in her garden. Though they grew in muck. we mixed in sand, and now I forget why. I was there constantly, doting over them and watering, probably unwisely, and they all eventually died. That was a love's lesson lost. Sooner or later, the old VHS tapes of me doing the selecting will be digitized. And I hope to collect again someday, but maybe just seed.

Making up for Past Mistakes

After Alaska, two more family moves landed me in Southern Colorado. But distracted by non-gardening pursuits, only in my senior year of High School did I first notice Iris (subgenus Limniris, series Longipetalae) missouriensis. Between Cañon City and Cripple Creek, growing on a scraped-off roadside embankment, the plants were short, widely spaced, and flowers were mainly bright lavender purple with yellow signals. Only in return visits, did I become aware that these high desert and foothill populations naturally hug runoff and melt areas. So those I first saw, pitched high and dry, by a hot roadside, were likely remnants from construction and grading. But growing as they were, it showed their adaptability and strength.

Iris missouriensis, upland form, NW of Crested Butte, Colorado, 10,000'

Iris missouriensis, upland form, NW of Crested Butte, Colorado, 10,000'

Iris missouriensis, upland form, NW of Crested Butte, Colorado, 10,000'

This past summer, in late June, I made a point to chase this species from the rugged Colorado lowlands (still high, over 5,000 feet), where it was nearly finished blooming, to the interior mountains, where it was just peaking. In all areas, plant habit and flower color were variable. The wetland forms were generally much taller, about 3 feet. The thickest patches in the high mountains were half that height, mostly pale blue. But in the distance, obstructed by a rushing creek, were some in white and darker purple colonies. At over 10,000 feet, it was breathtaking to see these plants, watch their pollinating bumblebees at work, and bask in the miracle of how they even got there.

Iris missouriensis, wetland form, NW of Cañon City, Colorado, 6,200'

After settling in the Chicagoland area decades ago, I first completed a degree in Horticulture and then went on to complete two more stabs at college. Through much local exploration, I began to see our native Iris (subgenus Limniris, series Laevigatae) virginica Shrevei in our many local wet areas.

Even years ago, I noticed it was often competing with the shade of invasive glossy buckthorn, Frangula alnus, or encroached by the aggressive Eurasian Iris (subgenus Limniris, series Laevigatae) pseudacorus. In these photos, snapped in late May along the Fox River, in Batavia, you can see the pseudacorus are not only photobombing this lovely and highly variable population but edging them out.

Iris virginica Shrevei, hiding near encroaching I. pseudacorus - near the Fox River - Batavia, IL

Iris virginica Shrevei on the banks of the Fox River - Batavia, IL

A pale lilac colored Iris virginica Shrevei on the banks of the Fox River - Batavia, IL

Though much damage to native Iris populations as well as wildlife habitats has already been done, in 2013, Iris pseudacorus was added to the ILLINOIS INJURIOUS SPECIES LIST, and it is now illegal to transport, barter, buy, sell or trade here. Fines for infractions are not less than $1,000 or more than $5,000 per incident. Now to begin cleaning up the mess of the pseudacorus that's already here.

In the detention pond of a local McDonald's, without pseudacorus encroachment, a burgeoning population of I. v. Shrevei has emerged.

Iris virginica Shrevei with encroaching I. pseudacorus, on the banks of the Fox River - Batavia, IL

The site was bulldozed and reconstructed a dozen years ago, and it seemed there was only one Iris remaining - but they have gradually increased, and this past spring was the best bloom so far. This group also included a dark specimen, as well as one plant with exceptionally small flowers. What's really fascinating is that scattered juvenile fans vastly outnumbered the many blooming plants.

McDonald's management assisted with the photo shoot, and the GM said she grew up with Iris but never noticed these, behind the site and out of view. It just proves you never know where or when you'll make an Iris Friend - and they now have a new appreciation for "the ditch" out back!

EXPECT VARIABILITY!

These plants don't read their own press, and whenever you find wild Iris, individual plants may look quite different from one another mere feet apart!  Appreciation of the best of these differences leads to potential selection, and Horticulture – "the art and science of growing plants (well)” – my parentheses!  To see the lovely gradation of flower color, pattern, form, presence or absence of gold signals, and floral velocity in a Shrevei population to realize how diverse they are - even in a small area. Here are some of the lovely forms from the McDonald's population.

Iris virginica Shrevei growing in a stormwater detention (dry) pond McDonald's, Oak Brook, IL

Iris virginica Shrevei growing in a stormwater detention (dry) pond McDonald's, Oak Brook, IL

However, not all of our Chicagoland populations of I. v. Shrevei are as robust and variable as the Batavia or McDonald's populations. At Volo Bog State Natural Area, the few specimens appear sporadically, and the main encroachment is by cattail, Typha latifolia. The end result of the smaller localized gene pool is a lessening of natural variability.

Iris virginica Shrevei growing at Volo Bog State Natural Area, Volo, IL.

Iris virginica Shrevei growing at Volo Bog State Natural Area, Volo, IL.

Where to find them: Where will you see US native Iris in the wild?  Well, it depends where you live, and where and how hard you look. Check with SIGNA, your local botanic gardens, native plant societies, and Iris folks from your region.  Many US residents are within a 100 mile drive of one species or another – across two subgenera (Limniris, Lophiris) and a number of series.  They are mainly absent over extreme southern Florida and the harshest desert areas, but in some places locally abundant.  Whenever you see them, take note of location, bloom time, population characteristics and density, and natural variability – as well as other floral and faunal associations (including invaders). And please take photos and share them with other Iris Lovers, this is how we learn from one another! And in cases of fascinating variability within a population, it’s also how we assert that the plants don’t read their own descriptions.

MOST OF ALL, HAPPY HUNTING!

Editor's Note: Robert F. Gabella is a Horticulturist, Hybridist, Author, Consultant, and Project Manager based in Villa Park, Illinois - which Hardiness Zones 5a and 5b have managed to split in half - down the middle of his street! More at GardenOpus - and on Facebook & Twitter as GardenOpus.

Overcoming Climate—An experiment with Iris attica and Iris hartwegii australis

Kathleen Sayce, May 2017

Gardening on the coast in the Pacific Northwest, I grow many hybrids and several species of iris in the Pacifica (Californicae) group of beardless iris. The vigor of tall bearded iris is daunting—miss a year to divide and transplant, and my garden is overrun. I had to use explosives to clear areas (Joke! It just felt like black powder was more effective than a spade). 

Iris attica flowers, after seven years, three in the ground, four in a planter.

In 2010, the North American Rock Garden Society’s western study weekend was in Medford, Oregon. Gardens on the tour included Baldassare Mineo’s rock garden, Siskiyou Rare Plant Nursery, and a dozen private rock gardens in the area. A tiny bearded iris, Iris attica, came home with me. I planted it in the sunny end of a flower bed; it flowered the next year, and then began a slow decline. Four years ago, I removed it from the garden and planted it in a styrofoam box. 

In this new container, deep and well drained, tucked under an east-facing eave, Iris attica flourished and flowered. Which was when I discovered that squirrels, chipmunks and/or voles were eating the flower buds as they began to emerge and show color. [These varmints also ate my rainlilies.] But the plant was now sturdy and healthy; despite no flowers, Iris attica thrived in its new home. 

A working method to grow Iris attica in the Pacific Northwest:  a planter, a dry outside location (under eaves), very porous planting mix, and protection from animals during flowering. 

Last year we rebuilt the cold frame and added a band of heavy 1/2 inch wire mesh about a foot high all around the edge. This spring, when I saw buds emerging on Iris attica, I put the box in the cold frame; the mesh band was already open for spring. The result you can see, sans nibbling, is a planter packed with flowers. When it is done flowering, the planter will go back outside again. 

So, you are wondering, what is the link to Pacifica iris? 

I also have Iris hartwegii australis in my garden. This was grown from wild-collected seed, collected many decades before it was a listed species, then grown in a garden, and seeds from that plant passed to me. It flowered once and has been declining ever since. It’s native to mountains in southern California, which means the long wet winters here are probably wetter than it likes. It might quite like a box under the eaves. 

Iris hartwegii australis, ready to go into its new planter. Note the extensive root system--many more roots than on hybrid PCI plants. 

Richard Richards told me this about its native habitat:  

        “I. h. a. grows in its native range in decomposed granite with superb drainage.  It gets maybe 15 inches of water, occasionally in the form of snow, from November to April.  In the summer it gets a thunder shower about once a month.  There are often two or three inches of plant litter, mostly pine needles, above the young shoots in the late winter, and it grows up through this litter.” 

This spring, I dug up a sprawling clump of Iris hartwegii australis and tucked it in a styrofoam planter with a highly porous mix of coarse pumice and potting soil. I added some fresh compost and biochar for more soil carbon. I dressed the top of the planting mixture with granite gravel (chicken scratch), as its home mountains are geologically old granites of the Transverse Ranges in southern California.  Tucked along the eaves, the rainfall should be cut to under 40 inches, more like its home. This planter is close to a hose bib, and gets half days of sun (when we have sunshine). Summer soaking to mimic thunderstorms in the mountains is easy. 

Granite chips added on top, to help keep the soil mix in the planter in heavy rain, and in this case, to remind I. hartwegii australis of its natal home in the Transverse Ranges, southern California. 

My hypothesis is that native plants in these boxes do better than in thin-walled, dark-colored plastic pots, because the planting mix is deep and cool. I also grow Erythronium, Lilium and other bulbs in these boxes, where they can live for several years without transplanting. PCI seedlings do very well, though their roots will push through the styrofoam if left in there too long. In the winter, the well-insulated walls also protect the roots from freezing—just as in the ground. 

I’ll report back in a year or two on how this iris likes the planter. Or sooner, if it goes toes up!

SIGNA Newsletter -- Winter 2014 Issue

By Andi Rivarola

The new Winter 2014 edition of SIGNA (the Species Iris Group of North America) is out, and here's an introduction and short recap. 

As we say in SIGNA, invite a friend to check what SIGNA is all about and/or to join the society. They won't regret it and neither would you. To join please visit our webpage, here.

In this issue, a fantastic article and introduction of two irises you may not have heard about: iris boissieri and iris serotina. Both are part of the iris Subgenus Xiphium that occur in the wild from the northwest of Morocco in North Africa, to as far east as the heel of Italy and also West into Spain and Portugal. 

From Russia, Nina Alexeeva introduces us to a new iris from the Kuril Islands, Iris lokiae. Find this exciting article in the section Irises from Russia.

You will also find wonderful list (including pictures) of recent introductions of SPEC and SPEC-X irises. A couple of white irises that caught my attention, and yes you may call me a white iris fool. 'Sushi' ( by Jill Copeland, R. 2013)  an I. pseudacorus X Ensata cross; and 'Precious Pearl' a crestata iris (by Barbara & David Schmieder, R. 2012); added them to my must-get list for next year.

I read with great delight the information on the article, History of the Iridarium, In Celebration of the 300th Anniversary of the Botanical Garden of Peter the Great in St. Petersburg, by
N. B. Аlexeeva, Curator. What an fantastic, detailed, historical account of this important organization. Loved this article and it made me aware of the amazing dedication and work that people do for the love of iris around the world.

There are so many more wonderful topics covered on this issue of the SIGNA Newsletter, we hope that you will consider becoming a member so you can read it in its entirety.

And, now for some more exciting news: The SIGNA Seed Exchange is now available. What is the Seed Exchange? For me, it's a wonderful way to grow species and other iris types in seed form to grow in my garden that otherwise I may not be able to obtain. The SIGNA Seed Exchange is a major benefit to SIGNA members. It is also the main fund raiser for SIGNA. The proceeds go toward the publication of the SIGNA Bulletin and help to sponsor collecting trips, special publications, and research grants. Although it is only available to SIGNA members, you may become a member when you order seeds. More information, here.

Don't forget to check our species iris database available to everyone on our website: http://signa.org/

Do you grow species irises, and what types do well in your area?

SIGNA Seed Exchange Siberians

by Jim Murrain

Kansas City, Missouri gardener Rick Davis had grown Bearded Irises almost exclusively for decades. Shortly after he joined the Greater Kansas City Iris Society he moved to a larger lot in Independence, Missouri. If you live in the Kansas City area and grow Iris you will eventually be asked to help with the Species Iris Group of North America Seed Exchange. 

Rick was asked to help count and package seeds a few years ago. This was his first serious exposure to beardless irises. The second year he helped he joined SIGNA and purchased a variety of seeds. At the end of the shipping season we had a sale on left overs and he purchased a few more.

Rick planted the seeds in tin cans and old flower pots and left them outdoors to let mother nature care for them. As Spring arrived he watered as needed and got good germination on most kinds of irises. Some didn't come up until the following year though.

He had especially good germination on siberian Iris cultivars. They looked like tufts of grass in the pots. When weather permitted he lined them out in a new garden area.

Unlike myself Rick is a keen gardener and kept the weeds at bay and watered the seedlings during dry spells. The photos here are three years old plants grown from those seeds.

While Rick had good flowering on many types of iris I was there at peak siberian season so can share these with you. You can see modern forms and species type like the one below.

I would call this a pink bi-tone.

A near double or six fall seedling.

I especially loved this row where the stalks were over four feet tall.

A soft yellow.

A good 'red' siberian.

A very cute species type flower in palest lavender with darker veins.

Many shades of Iris.

Soft pink with butter yellow styles and golden signals.

Almost a watercolor effect on this seedling.

Dick Davis discussing the garden with a member of the Greater Kansas City Iris Society

Unfortunately last spring was the last full year for Rick's garden. He dug and donated all of his bearded irises to a sale last summer. If he is able to keep the property into spring 2014 we will be selecting and digging beardless irises to move to member gardens. This is rental property and is listed for sale.

It was fun to see the amazing diversity that growing irises from a wide range of sources gave his garden in only a few years and at a minimal cost in plants.

The SIGNA Seed Exchange is arriving in early January and is a great way to add color and variety to your garden with the excitement of being first person to see a new seedling in flower.