Spring showers bring not only flowers! Slug and snail season is upon us and these slimy gastropods love, love, love to chomp away at iris and daylily foliage! This a friendly reminder to apply your preferred bait or exclusion barriers to control these pesky buggers.
Excessive foliar damage is not only aesthetically displeasing, but also diminishes photosynthetic activity and creates wounds that make plants more susceptible to attracting other pests and disease. So if you’re seeing slime trails and lots of holes in your foliage, it’s a great time to establish some control in the garden!
These pests are primarily active at night or on cool, cloudy days. Begin by tidying your garden by weeding and removing excess debris where slugs and snails love to hide and lay eggs. Bait applications do best following a spell of rain; an opportune time for gastropod activity. If you have furry friends that frequent your garden, be mindful to choose a pet-friendly bait. Exclusion barriers such as cracked filbert shells, plant cloches, and collars will also offer great protection.
For further detailed information on slug and snail management strategies, visit this amazing resource provided by Oregon State University.
Dwarf iris can be seen blooming among the tulips, weather depending.
Easy to plant, easy to care for, easy to enjoy! That is the Iris. And such variety too! Variety of size, variety of bloom season, variety of color, variety of style. Isn’t success in life all about the choices we make? That simple maxim can apply to the realm of the flower garden too. The Iris offer such a host of choices, one is surely to find just the right color, or size, etc. Let’s talk about the breadth of bloom time, for example. The Miniature Dwarf Iris and the Standard Dwarf Iris are among the very first Iris to bloom. Weather depending, of course, they open up their diminutive blossoms (just 5 to 15 inches in height) approximately mid-March to early April (in most temperate zones), heralding the launch of another promising Iris season.
The Dwarf Bearded Iris are no less hardy than their taller, more robust cousins. Dwarf Iris, both Miniature and Standard types, propagate with strength and, once in bloom, stand up to the early spring frosts. There are several wonderful resources available which provide great detail on the origins of these hybrids. The Dwarf Iris Society is a good place to start for further links and leads on exploring the subject. Several Iris breeders today have introduced spectacular Bearded Iris cultivars in miniature.
Intermediate Iris bloom early in the spring, often alongside tulips
As spring widens its embrace upon the land, weep not for the fading Dwarf Iris, for the Intermediate, Median, or Border Iris are opening on the garden scene! A bit taller than the tallest Dwarf, yet shorter than the shortest Tall Bearded Iris, they offer brilliant bloom to span the gap between March and May, a beautiful complement to the Cherry blossoms! The earliest blooming Tall Bearded Iris will overlap with the later-blooming Intermediate Iris, to create a seamless floral transition of color. Sprinkle in several mid-season and late-season Tall Bearded Iris around your garden, and the color show continues well into June.
A few moments spent casually mapping out the succession of Iris blooms in your garden will yield months of rainbow color from your ankles to above your hips! Dwarf, Intermediate, Tall Bearded, as well as Beardless Iris, are all planted in the summer months. Below is a simple chart, indicating approximate bloom times for Iris ranging from the Miniature Dwarf to the Tall Bearded, and including the Beardless Iris such as, Siberian and Louisiana. Bloom time is greatly dependent on weather conditions and gardening practices, however. For example, Reblooming Iris require regular extra fertilization, watering and dividing.
March
April
May
June
July/Aug/Sept/Oct
Min. Dwf. & Std. Dwf.
(5″ to 15″; 5cm to 28cm)
Intermediates & Border
(16″ to 27″; 40cm to 68cm)
Tall Bearded
(28″ to 48″;70cm to 122cm)
Tall Bearded & Beardless (such as, Siberian and Louisiana)
Reblooming Bearded Iris of all sizes
Intermediate Iris (IB) “Many Mahalos” (Aitken, 2003) blooms early, among the tulips.
If you are one who can hardly wait for the year’s Iris season to start, you have merely to plant some Dwarf Bearded Iris this summer. You will have Iris blooming with the first inkling of spring warmth. Even if you consider yourself simply a fan, a dabbler, a curious gardening newbie to the world of flowers, give the Dwarf Iris a try!
Do you grow Dwarf Iris? Share your comments below!
Standard Dwarf Bearded Iris, Heather Carpet (Chapman, 1999), hugs a garden path.
Easy to plant, easy to care for, easy to enjoy! That is the Iris. And such variety too! Variety of size, variety of bloom season, variety of color, variety of style. Isn’t success in life all about the choices we make? That simple maxim can apply to the realm of the flower garden too. The Iris offer such a host of choices, one is surely to find just the right color, or size, etc. Let’s talk about the breadth of bloom time, for example. The Miniature Dwarf Iris and the Standard Dwarf Iris are among the very first Iris to bloom. Weather depending, of course, they open up their diminutive blossoms, just 5 to 15 inches in height, approximately mid-March to early April (in most temperate zones), heralding the launch of another promising Iris season.
Intermediate and Border Bearded Iris blooming at Schreiner’s Iris Gardens
Weep not for the fading Dwarf Iris! For the Intermediate, Median, or Border Iris are opening on the garden scene. A bit taller than the tallest Dwarf, yet shorter than the shortest Tall Bearded Iris, they offer brilliant bloom to span the gap between March and May, a beautiful complement to the Cherry blossoms! The earliest blooming Tall Bearded Iris will overlap with the later-blooming Intermediate Iris, to create a seamless floral transition of color. Sprinkle in several mid-season and late-season Tall Bearded Iris around your garden, and the color show continues well into June.
Let’s have a few more words about these Dwarf Iris, though. The Hungarian language has a saying, “The pepper corn is small, but mighty.” (Kicsi a bors, de erős.) The same can be said about these Iris of smaller stature. They are no less hardy than their taller, more robust cousins. Dwarf Iris, both Miniature and Standard types, propagate with strength and, once in bloom, stand up to the early spring frosts. There are several wonderful resources available which provide great detail on the origins of these hybrids (quite fascinating, really). The Dwarf Iris Society is a good place to start for further links and leads on exploring the subject. Several Iris breeders today have introduced spectacular Bearded Iris cultivars in miniature.
A few moments spent even casually mapping out the succession of Iris blooms in your garden will yield months of rainbow color from your ankles to above your hips! Dwarf, Intermediate, Tall Bearded, as well as Beardless Iris, are all planted in the summer months. Below is a simple chart, indicating approximate bloom times for Iris ranging from the Miniature Dwarf to the Tall Bearded, and including the Beardless Iris such as Siberian and Louisiana. Bloom time is greatly dependent on weather conditions and gardening practices, however. For example, Reblooming Iris require regular fertilization and dividing.
March
April
May
June
July/Aug/Sept/Oct
Min. Dwf. & Std. Dwf.
(5″ to 15″; 5cm to 28cm)
Intermediates & Border
(16″ to 27″; 40cm to 68cm)
Tall Bearded
(28″ to 48″;70cm to 122cm)
Tall Bearded & Beardless
Reblooming Bearded Iris of all sizes
Music, Standard Dwarf Bearded Keith Keppel, 1999
As Barbara Whitehouse and Bee Warburton write in their chapter entitled “Miniature Dwarf Beardeds”, in The World of Irises, (The American Iris Society, 1986) “…each iris lover should grow at least one or two clumps of them …. However, they are so charming that one or two clumps may ultimately become a whole bed or border.” (pg 145)….
If you are one who can hardly wait for the year’s Iris season to start, you have merely to plant some Dwarf Bearded Iris this summer. You will have Iris blooming with the first inkling of spring warmth. Even if you consider yourself simply a fan, a dabbler, a curious gardening newbie to the world of flowers, give the Dwarf Iris a try!
Do you grow Dwarf Iris? Share your comments below!
Will the recent mild winter temperatures around the country impact the winter dormancy cycle of the bearded Iris? Hard to say at this point. Iris are tough. However, any heaving of the soil from the hard freezes which might still come could dislodge the rhizomes, which could be disastrous for their survival. We recommend keeping a close watch on the Iris beds should the weather bring hard freezes. A winter protection can help minimize any potential damage typically caused by hard freeze cycles. Straw, evergreen branches or leaves, or even mounding the soil up around the rhizomes are recommended forms of winter protection. The key with winter protection is to remove it when the threat of hard freezes has passed in the spring. If a spring-time freeze is forecast after new shoots have begun to show, be sure to shield these shoots with recommended protection.
So, what do Iris do all winter? They sleep – or rather, they prepare for the springtime show. Bearded Iris grow best in temperate climates because they require a dormant period which is brought on by winter’s low temperatures (consistently below 40° Fahrenheit (below 5° Celsius) for an extended duration). This dormant period allows the rhizome to convert the energy, which it collected all spring and summer through the plant’s foliage, into the production of new foliage and bloom stalks. Should the current warm trend continue in areas that typically see much colder temperatures this time of year, gardeners might see mixed results in the springtime bloom of the Bearded Iris. Unusual weather patterns, such as sudden freezes following periods of mild temperatures can result in bent stems or wavy leaves (known as “pineappling”), for example. Despite the disfigured appearance of the stem and foliage, the plant is healthy. As long as the rhizome remains firm, the plant will continue to grow. Remember, lack of bloom does not necessarily mean that the Iris plant has died.
We hope that you have found this tidbit of information useful. We welcome your questions and comments in the Comments section below.
Here we share a collage of images from our archives of the Display Gardens in winter through the years …
Summer days, summer gardens. Most enjoyable. For the Tall Bearded Iris in your garden, summer is also the perfect time to grow, to expand, to be transplanted.
Bearded Iris experience two root growth cycles in their annual growing cycle. The springtime growth we all eagerly anticipate in our Iris beds begins with the lengthening of the foliage upward and the root system outward. The rhizome uses its stored-up nutrients.”….As the bud swellings appear in the new fans there is a quickening of the new roots that will supply the plant with nutrients for new growth during and after bloom. The old roots from the previous year’s growth then wither and decay.” ( The World of Irises, p 314) After the springtime color display of full bloom has passed for the year, the underground development begins in earnest.
The Iris revel in the long summer days. During the six to eight weeks post bloom, the plants absorb the necessary nutrients for next spring’s growth and bloom. The rhizomes send out new increases which will become new self-contained, self-supporting rhizomes by early to mid-July. Once the summer growth is complete, the Iris takes a well-earned rest. Enter the gardener, spade in hand, plan in mind. Now is the time to dig, divide, share and transplant.
Here, in the Willamette Valley our Iris bloom season ends early- to mid-June. Therefore, at Schreiner’s Iris Gardens, we begin digging our fields early to mid-July. On a smaller scale in your garden, consider digging your Iris to transplant this summer if the clump is three to five years old. Share the divided Iris not only in your own garden, but also with the neighbors, friends and family….garden clubs, retirement homes, 4H clubs, and so on. Allowing Iris clumps to become over grown can lead to poor or no blossoms, smaller and smaller rhizomes, and outbreaks of rhizome-based diseases (such as bacterial soft rot).
Remember that the latest date for transplanting depends on local conditions. Newly planted Iris require a minimum of 6 weeks to set their new roots. Thus, they should be in the ground a minimum of six weeks before the first hard frost. Consult local resources to determine the frost dates in your area.
So, how do you go about digging and dividing the Iris in your garden? Visit our “How to Grow Iris” pages for more details and images on dividing and caring for your Iris! Take a look at another great Iris care resource, “A Guide to Bearded Irises: Cultivating the Rainbow“, by Kelly D. Norris.
What’s happening in the July garden? To trim or not to trim the foliage…Depending on your location, you may have a handful of lingering Iris blossoms, or all of your bloom stalks might be sporting the papery remains of the seasons’ blooms. When all blossoms on the stalks have finished, carefully trim the bloom stalk at its base. Leave all green foliage, though, in place. They offer an elegant vertical visual throughout the garden. You may remove any browned and dry leaves. Keep the Iris beds clean and free of weeds. Well-established Iris plants are drought tolerant. Newly planted Iris, though, do require a good long drink approximately every 7 to 10 days if the weather is very dry. Reblooming Iris also prefer irrigation between the spring bloom and summer/autumn re-bloom times. We recommend an application of a low-nitrogen fertilizer (such as 6-10-10) approximately one month after blooms have finished. Superphosphate and bonemeal also work well as a fertilizer for Iris.
Summer brings the promise of long days enjoying our gardens and all aspects of our lives. The season also brings with it our annual Summer Sale. You’ll find over 300 varieties of Tall Bearded Iris at deeply discounted prices.
Hot summer nights. Hot summer days. Sultry summer afternoons….. Perfect for dreaming, for transformation. For the Iris in your garden, it’s the perfect time to grow, to expand, to be transplanted.
The single Iris rhizome you planted last summer has transformed even in just one year, promising an even greater display come next spring. Here’s how: Bearded Iris experience two root growth cycles in their annual growing cycle. The springtime growth we all eagerly anticipate in our Iris beds begins with the lengthening of the foliage upward and the root system outward. The rhizome uses its stored-up nutrients. Borrowing from Ben Hager, who writes in his chapter on Bearded Iris propagation in The World of Irises, “….as the bud swellings appear in the new fans there is a quickening of the new roots that will supply the plant with nutrients for new growth during and after bloom. The old roots from the previous year’s growth then wither and decay.” (p 314) The springtime growth of the Iris, from bud to past bloom, is largely above ground… thankfully for us gardeners who eat up the sight with our winter-weary eyes. After the color display of full bloom has passed for the year, the underground development begins in earnest.
The Iris revel in the long summer days. During the six to eight weeks post bloom, the plants absorb the necessary nutrients for next spring’s growth and bloom. The rhizomes send out new increases which will become new self-contained, self-supporting rhizomes by the end of the summer. Once the summer growth is complete, the Iris takes a well-earned rest. Then gardeners eager to expand their Iris empire can begin to think about dividing older Iris clumps and transplanting the new rhizomes.
The Iris rhizome has reached full maturity as the sultry July days, the dog days of August arrive; summer dormancy has set in. Here, in the Willamette Valley our Iris bloom season ends early to mid June. Therefore, at Schreiner’s Iris Gardens, we begin digging our fields early to mid-July. We are “transplanting” our Iris all over the world. On a smaller scale in your garden, consider digging your Iris to transplant if the clump is three to five years old. Overgrown clumps can lead to poor or no flowering habits, smaller and smaller rhizomes, and outbreaks of rhizome-based diseases (such as bacterial soft rot). Share the divided Iris not only in your own garden, but also with the neighbors, friends and family….garden clubs, retirement homes, 4H clubs, and so on. Remember that the latest date for transplanting depends on local conditions. Newly planted Iris require a minimum of 6 weeks to set their new roots. Thus, they should be in the ground a minimum of six weeks before the first hard frost. Consult local resources to determine the frost dates in your area.
So, how do you go about digging and dividing the Iris in your garden? Visit our “How to Grow Iris” pages for more details and images on dividing and caring for your Iris! Take a look at another great Iris care resource, “A Guide to Bearded Irises: Cultivating the Rainbow“, by Kelly D. Norris.
The summer solstice, a most propitious date — brings the promise of long, heady days of summer, reaping the success in our gardens and in all aspects of our lives. June 21st also heralds the start of our 2014 Summer Sale. You’ll find over 350 varieties of Tall Bearded Iris at deeply discounted prices. Pictured on the cover of our summer sale catalog below is a special bonus for your summer sale order. “Swept Off My Feet”, one of our 2014 introductions, is the 2014 Summer Sale bonus. Use coupon code SSC2014 to get yours. (*Limit one per customer; minimum $25 order of plants.)
What’s happening in the June garden? Depending on your location, you may have a handful of lingering Iris blossoms, or all of your bloom stalks might be sporting the papery remains of the seasons’ blooms. When all blossoms on the stalks have finished, carefully trim the bloom stalk at its base. Leave all green foliage in place. They offer an elegant vertical visual throughout the garden. You may remove any browned and dry leaves, though. Keep the Iris beds clean and free of weeds. Well-established Iris plants are drought tolerant. Newly planted Iris, though, do require a good long drink approximately every 7 to 10 days if the weather is very dry. Reblooming Iris also prefer irrigation between the spring bloom and summer/autumn re-bloom times. We recommend an application of a low-nitrogen fertilizer (such as 6-10-10) approximately one month after blooms have finished. Superphosphate and bonemeal also work well as a fertilizer for Iris.
Winter Iris Care Does your Iris bed look like this right now…. under a foot of snow? Iris beds covered in a blanket of snow need no care at this time. Let nature’s insulator do its job.
Or maybe they look something like this….a tangled mess of decayed leaves? Well, even though it’s not an ideal sight, don’t be ashamed. Let’s talk about how to remedy the situation.
If you have a garden that boasts bare ground right about now, you most likely are also starting to see signs of spring – along with the darling and beloved daffodil, tulip and hyacinth shoots, weeds and grass blades are also emerging. Now is a good time to dote upon the forgotten Iris bed, and trim back the dead, decayed foliage. If the leaves are droopy, brownish-gray — completely lifeless — then gently tear them off at the base, like a sheet of notebook paper from its spiral. If the leaves are still sturdy and green, trim those down to below any evidence of leaf spot.
Clear away the debris from the beds, pick out the emerging weeds, if any, from the soft soil. You might spray a preventative fungicide at this point, as well. Follow all manufacture’s recommendations carefully. If you anticipate another freeze in your area, you can lay evergreen boughs or straw over your newly-cleaned out Iris beds for added protection until the spring temperatures return in earnest. At which time, you will remove any covering. Remember, rhizomes grow close to the surface and want to feel that sunshine. Bearded Iris can be very forgiving, largely due to their very sturdy nature.
Bulbs vs. Rhizomes
Just a short two bits on the distinction between two of the methods herbaceous perennials (including Bearded Iris) utilize for food storage…. Plants have evolved several methods of storing food so that they can spring to life when the conditions are right, bulbs and rhizomes among them. The definition of a bulb is any plant that stores its complete life cycle in an underground storage structure. The “food” is converted sunshine, collected through the leaves through photosynthesis, and carried into the “larder”. Only some of the plants commonly called bulbs actually are bulbs. Bearded Iris, although falling into the above definition, develop a storage structure known as a rhizome (really an underground “stem”). The rhizome is the larder for nutrients that give the plant the energy it needs to grow, bloom, and complete its life cycle. Trimming the Iris foliage too early deprives the plant of its food intake. Rhizomes grow horizontally just under the surface of the soil which is why they must be planted shallowly, in soil with good drainage.
Celebrate the passion of Valentine’s Day all over again during Iris bloom season. Send these five radiant Tall Bearded Iris to your sweetheart, or invite them into your own heart (and garden)* with our annual Sweetheart Iris Collection.
These five sweet beauties offer wonderful discount and a lovely array of pink, just screaming out, “Be Mine!”
Imagine yourself next summer, the heat of July warming your face as you gaze across your garden, colorful perennials dot the landscape… but you’re thinking back to springtime, May, when your glorious Iris were in full bloom. Nothing compares… But wait! Consider this: a second bloom season for Iris. Yes, reblooming Iris hold the promise of reliving the spring time bloom in the middle of summer!
Scanning the summer garden, speckled with the hues of phlox, cone flowers, daisies, lilies and the like, my heart skips a beat as I catch sight of a Tall Bearded Iris! A delightful surprise in the midst of the late summer bloomers. It’s one thing to take in the wash of color in a garden full of Iris at peak bloom in May; it’s quite another to find a lone flag, so seemingly out of time and place, among the rudbekia!
As with any gift of nature, there are caveats. Reblooming Iris, while so satisfying when they produce bloom in July, August, September and even into October, do not bloom on command. Their remontancy is dependent upon multiple factors: soil conditions, weather, gardening practices, to name a few. Rebloomers need extra fertilizing (low in nitrogen, 5-10-10) and water compared to their single-bloom cousins. The plant’s own genetics, of course, play a strong role as well. Varieties of Iris that rebloom consistently here in the Willamette Valley (here is a partial list) may exhibit different behavior in other locales. Just as there are varieties of Iris that do not bloom every year in the spring bloom season, so is the case with summer re-bloom.
But when it all comes together… Wow! These bonus blossoms just scream to be united with pink and red lilies, flounces of phlox, fist-fulls of Black Eyed Susan (Rudbeckia) — anything blooming nearby. Rich summer bouquets can take shape before your eyes. Here are several of my favorites from a recent jaunt through the garden.
Pictured above a charming reblooming Dwarf Iris, Autumn Jester, cozies up to its little companion daisy. Wouldn’t this be lovely blooming among the snapdragons and pansies along a low summer border? Below, the pinks pack a punch. Peggy Sue mixes with the lovely lilies and echinacea for a sight so divine.
Pure As Gold mixes with Immortality, above, continuing the white-yellow theme carried by the daisies. The hosta leaf and blue thistles provide pleasing contrast to the bunch. “Cowslip” sneaks in a bit of summer informality….
Ominous Stranger, above, blends harmoniously with sprigs of cedar and blue thistles. Below, October Sky loves the phlox, verbena and hosta. Best Bet contrasts with rudbeckia.
Selecting the varieties of reblooming Iris for your garden which will be successful in your area of the country (or the world), is a matter of trial and error. The rebloom is a bonus. At the very least, you will enjoy one season of bloom in the springtime. Give it a try!
The Reblooming Iris Society offers a plethora of information on the development and care of Iris that rebloom. Start with their page offering tips for growing rebloomers, then explore the greater site for more information.
Have you planted reblooming Iris in your garden? Tell us about your trials, errors and successes. Please include your geographic area as well.
P.S. And speaking of geographic area, take a look at our Iris order date cut-off map for information on the last date to order Iris to ship to your neck of the woods.
Let’s say a friend told you about this patch of once-lovely Iris which has become completely engulfed by grass… (or maybe that friend is you…) You tell your “friend” that her situation reminds you of something you once read by Sara Stein*: “I appreciate the misunderstanding I have had with Nature over my perennial border. I think it is a flower garden; she thinks it is a meadow lacking grass, and tries to correct the error.”
July, August and, in some areas, September, is the time to assess the situation in your Bearded Iris garden, and rectify the misunderstanding you might have with Nature. If it’s been a few years (say three to five) since you planted your Iris, it is likely that the clusters have grown, and over-grown, themselves into a large mass of rhizomes 12 to 24 inches wide. If you are (or know of) that friend described above, fear not. If you see foliage above the blanket of grass, the Iris can be saved! Read on.
Before you reach for the shovel, though, let’s review some tips on dividing and transplanting the new Iris babies.
Iris Identity: If you have your Iris labeled, you will want to label all of its babies. Prepare tags of some sort to help you keep track of what you are transplanting and where. If you haven’t labeled the Iris in your garden, then proceed unfettered by the bondage of labels….
Digging the clumps: Depending on how densely packed the Iris clump is, you may wish to dig up the entire mass and work on it out of the ground. In the case of the clumps overgrown with grass, you’re best bet is to dig up the whole shebang. Carefully pull the soil and grass away from the rhizomes and roots so that you can see what you’re dealing with. Take care to remove as many of the grass roots as possible. Once cleaned up, you will likely find that the mass of Iris resembles a tangle of fresh ginger, or small oblong potatoes, some of which will have fresh green foliage attached.
New growth on left and right of spent rhizome
Separating the plants: The rhizomes with the foliage are the plants you will keep. Any rhizome which has no foliage is “spent”, and will not bloom again. It can be discarded. At this point, you can decide how many of these new plants you’d like to replant. Some of the new growth may yet be quite small, the size of a cherry. These are called “nubs”, and will have tiny green leaves. You can plant these, but expect possibly two years at least before you see any blooms.
To separate, carefully snap or slice the rhizomes at the junction between the old plant and the new growth. Take care to disentangle the roots so that the new plants retain their set of roots.
Cut or break off new growth from original rhizome
If the foliage on the new plant is very tall, you can trim it back to 6 inches to make transplanting easier.
Prepare soil for transplants: For the area where you intend to plant the new growth, dig up the soil 6 to 12 inches deep, remove weed sprouts, mix in some organic mulch or a low-nitrogen fertilizer (follow manufacturer’s recommendations for quantity and ratio) to give the soil a nutritional boost. Break up large clumps of soil and smooth out the area. Plant your new iris so that the roots are covered but the top of the rhizome is showing above the surface of the soil.
Water in: Water at the time of transplanting. Newly set plants need moisture to help their root systems become established. Specific watering requirements depend on your climate and soil, but keep in mind that deep watering at long intervals is better than more frequent, shallow watering. Once established, Iris normally don’t need to be watered except in arid areas. It is always better to underwater than over water. Too much water can induce rot.
What to do if you have more Iris shoots than you know what to do with: Consider donating the extra plants (labeled or unlabeled) to a nursing home, school, or community center in your area. You can also check with your neighbors to see if they’d like any of the offspring.
Getting ready to divide your Iris? Tell us what you do with the extras. We’d love to read your comments.
*Sara Stein, influential advocate for gardening with native plants, and author of “Noah’s Garden: Restoring the Ecology of Our Own Backyards” (Houghton Mifflin, 1993).