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To help gardeners understand which plants will grow well for them, the entire USA has been segmented into ‘Plant Hardiness Zones’. Knowing your zone number is helpful when shopping for plants because:
The "Other Irises", under-used stars of the garden. Japanese, Siberian, Louisiana and Wild Irises.
First, let's dispel the confusion that surrounds this group: Once they were known as Kaempferi Irises, today many call them "The Butterfly Irises", but the correct common name is simply "Japanese Iris." In luscious colors of purple (see large photo at top), pink, and endless bicolors, they have been cultivated in Japan for over 500 years, and were once restricted to enjoyment by royalty only. Though many think they are, they are not water dwellers. They require about the same conditions as ferns, astilbes or impatiens—just moist ground, which most all gardeners can easily provide. As you can see by the photos, these iris blooms are quite different from the tall "stand-up" flowers of the big Bearded Irises. With Japanese Irises, both sets of petals are more flat, forming a simpler, flatter--and many think more beautiful--flower. Japanese Irises form large lavish hardy clumps and are highly decorative. They're also great for cutting.
This is the iris favored by many landscapers over the Bearded group. And the reason is obvious. Hardy as oaks, Siberian Irises form very handsome clumps of grass-like foliage with a host of blooms rising on elegantly thin stems. The flowers are smaller than the Bearded Iris blooms, but once they're gone, the foliage of this group remains a highlight in the garden all season long, as decorative as almost any ornamental grass. Siberian Iris' hardiness and longevity are also big plusses. Once established, they will grace a garden for generations. There are fewer hybrids here, compared to the Bearded group, but there are now some quite glamorous bi- and tri-colors. Still, purist gardeners usually prefer the classic blue, purple and yellow flowers from this elegant group. They can be planted in spring or fall.
One of the most under-used groups in gardening, these magnificent irises are our own native plants — spectacular wildflowers from the bayous and wetlands of the Gulf Coast. The have large flowers, often from 4 to 6 inches across, and a form more like the Japanese types — flatter and wider than the tall up-and-down Bearded Iris bloom. The hybrids of these beauties are often hardy all the way to Canada, so gardeners almost everywhere can enjoy them now. They enjoy conditions similar to the Japanese types, so all you need is a moist area, rich soil, and partial shade. Any well-watered partially-shaded perennial garden will do. This group is world famous for its large flowers and wide palette of coloring, featuring some colors found in no other group. The dark "Black Gamecock" is known everywhere, and the Louisianas are justly famous for the very dramatic markings, called "flashes" of gold in their centers, clearly seen in the famous, "Sinfonietta."
Many of the "species" or wild irises are among the Spring-Planted beardless group. The two best known are our own Wild Iris, "Blue Flag" so common and loved in the Northeast. And the taller "Yellow Flag", native to England. The Blue Flag is a perfect plant for your wildflower meadow, or anyplace else in your landscaping where there is plenty of water in spring. They cannot be submerged, but enjoy wet meadow and wet woodland locations. The very strong-growing Yellow Flag is also useful, but be aware that it can be invasive, and end up choking shallow waterways, much like cattails. Be sure it is not considered a pest in your area before planting.
First, of all, understanding the various groups of irises is really simple. The big, tall flowers we all know and love called "Bearded Irises" are planted in late summer, not in spring. And they are so large and so popular, with so many colors and hybrids, they often overshadow these gems. Don't let that happen in your garden.
These are examples of the most popular irises — the large-flowered tall ones that are planted in late summer. The popularity of these, with thousands of varieties and hybrids available, tend to overshadow the wonderful "Beardless" irises discussed on this page. Bearded Irises are also sometimes called "German Irises."
What's a bearded iris? Look close, and you'll see the "beards"… the little fuzzy parts centered on each of the "falls". Falls are the lower petals that droop down on Bearded irises. (The upper set of petals are called "standards.")
The beardless group, then, includes pretty much the rest of the irises, and that means several kinds: most importantly Japanese, Siberian, Louisiana, and certain Species (or Wild) Irises. As you can tell by the names, beardless irises occur worldwide. They also require certain growing conditions.
You may have heard that many of the beardless irises are "pond irises" or "water irises", and that's because many of them can actually grow in shallow water. But that is not a requirement. Certain Japanese Irises, Louisiana Irises, and many of the Wild Irises love moisture, but none of them must be planted actually in the water. If you have a pond or steam, they'll love that location, but most people don't. And all these plants are perfectly happy in a well-watered perennial garden. Just give them locations where they'll get plenty of moisture throughout the season.
Mulching is important with this group. Since most of them enjoy the same moist, partially-shaded conditions as hostas, ferns, astilbes and impatiens, mulch their roots to help them retain moisture during warm dry periods. Bark chips, peat, or any good moisture-retaining mulch will be a big help. Full sun is ok, too, but no irises should be in blazing hot dry areas.
They need no more than the usual feeding, like most flowering perennials. For feeding perennial gardens, my favorite perennial expert, Frederick McGourty, recommends familiarizing yourself with standard perennial flower fertilizers, which are always labeled with three numbers in a sequence, such as 5-10-5 or 5-10-10, or 10-10-10. These numbers on the bag refer to percentages of Nitrogen, Phosphorus and Potassium, in that order. McGourty explains that the most important element here for flowering plants is the middle number, Phosphorus, so he recommends choosing a fertilizer with the middle number no lower than the other two.
If your garden is new, try to rake in your fertilizer a week or two before planting. And in later years, one feeding in spring (remove the mulch, and rake it in) should do. If you use dry granular fertilizer, remember to scatter it when the soil is wet and the foliage of your plants is dry. Dry fertilizer sticking to stems and leaves can burn the plants.
If you're new to the neighborhood, it's always good to give your local county extension agent a call, and discuss soils and feeding with him or her. That's what they're there for. It's great local advice, and it's free. You'll find the number in the phone book under US Govt, Cooperative Extension Services.
These irises have a variable root structure, but all are quite obvious when it comes to dividing. Of course, you may never choose to divide yours. If you're like me, you love large expanding clumps of Siberian Iris, for example. I've never seen the size of the clump interfere with the bloom. And the incredible photo of that purple Japanese Iris at the top of this page proves that an older, larger clump of that iris blooms just beautifully.
But you may choose to divide. If you do, just after bloom is a good time, since then your divides will have the season to regrow and prepare for next summer's flowering. As with all dividing, try to keep your clumps large; don't reduce your plant to little bits that will take years to grow back to blooming size. If your iris root is a mass of rhizomes (like Blue Flag will be), simply cut them with a sharp knife, leaving several rhizones per clump. But most of this group will have a mass of fleshy roots, similar to daylilies. A sharp spade will do the trick, and to disturb the growing plant as little as possible, you may do what I do. For a Siberian for example, don't dig it up. Just sink the spade directly down in the middle of the clump and cut straight through the roots. Then pry up one of the halves, take it out of the ground, and then fill in the hole. Your undisturbed half will then be very little affected by the whole operation. Then take your removed half, chop it into (large) pieces and plant them. Water before and after all this, and you should have no problems. It's really easy. If your clumps are large, though, it can be heavy work.
Wintering Spring-planted Irises. One of the names says it all: Siberian Irises are as hardy as oaks, and really need no winter cover or care. Blue and Yellow Flags are the same. Japanese Irises are much the same, too but some hybrid varieties may need some winter protection. Louisiana Irises are the ones to watch when it comes to winter hardiness. Since they're from the Gulf Coast area, some are hardy only a few zones north. However, many of the most popular hybrids have been bred for hardiness all the way into Canada. So when you choose yours, check the hardiness of your favorites.
With about 200 different species scattered worldwide, gardeners probably know fewer of these flowers than any other popular group. It's all because of the intense interest in just a few of the species, for centuries. Today, of course, everything is dominated by our oversized, "bigger is better" passion for the tall Bearded Iris, also previously called German Iris.
Anyone who studies Greek mythology learns that Iris is the name of the Goddess of the Rainbow, surely one of the best assignments on Olympus. And because of the great elegance of the iris bloom, it has been the symbol of monarchs and royal families throughout history. In fact, one of the earliest known artworks of an iris is a fresco in King Minos' palace on the Greek Island of Crete. The palace dates from 2100 BC.
Of course, the most famous royal use of the iris as symbol of power and position was that of the Bourbon Kings of France, including Louis XIV. The iris was adapted on royal banners as the "Fleur de Lys", the elegant, three-sectioned symbol that disappeared from the French flag with their Revolution, but is still quite common in the decorative arts. In fact, today it still proudly adorns the beautiful flag of the French-founded Province of Quebec in Canada, shown at right.
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