Flowering Shrub Evolution


As the Product Develop Manager at Spring Meadow Nursery my main responsibility is to identify new and superior plants for the Proven Winners ColorChoice flowering shrub line. These are exciting times for me because never before has so much effort been put into the development of shrubs. Breeders, nurseryman and even amateur gardeners have begun to see the potential of shrubs and are actively seeking improvements. In my opinion the results are amazing. These new plants are changing the way we garden, landscape and produce plants. Long thought of as the “bones” of the garden, shrubs are now the ornamentation too. Once the backdrop for perennials and annuals, a new breed of flowering shrubs have proven themselves as colorful and as showy as any herbaceous plant.

Think for a moment about how Endless Summer has changed the way we view Hydrangea or how Wine & Roses has influenced our old perception of Weigela as a one season plant. These are but a few of the better known examples but there are many more subtle, yet significant changes taking place over a wide range of species. Growers and Retailers need to understand these changes if they hope to benefit and meet demand. For example when I googled the plant name Leptodermis oblonga three years ago I got zero responses. Today I got 1,710 references including long discussions about the plant by gardeners communicating in forums. Did you know this great little shrub that blooms all summer long? Obviously the word has gotten out to gardeners.

Not all of the plants causing shifts in the market are new. Some have been around for years but because of changing times have found an audience. Concorde barberry was an obscure little plant developed at Wavecrest Nursery in Fennville, Michigan. Now with the increased interest in invasive species and as the problems encountered on the East Coast mount, ‘Concorde’ turns out to be a winner. Not only does it have great rich purple leaf color and a dwarf mounded habit, it is also environmentally friendly, hardly producing a seed. It turns out there are many environmentally safe alternatives when we start looking at the cultivars we currently grow. This niche will get even larger as researchers begin to introduce new sterile cultivars. They’re coming, but will states ban them before they are introduced? Let’s hope not.

What’s driving this explosion of new and improved shrubs? First, there is intense competition at retail. Savvy independent garden centers know they have to differentiate their stores from the big boxes. New and improved plants are a clear strategy to set a garden center apart from the chains. Big box stores have been more concerned about price than the actual product. They won’t pay extra for superior genetics because they don’t understand plants in general. Heck, many have not yet figured out that plants need water to live. The point is that independents understand what makes a good plant and they are actively looking for new products to compete and win in the marketplace.

The second driving force behind new plants has been the increased use of plant protection. Plant breeders can now make a return on their breeding investment. Canada has a new breeders’ rights law and Europe now has EU wide breeders’ rights system. In the U.S., people who have long opposed the plant patent system now see that patents, if used properly, can benefit everyone. Open licensing and returning a portion of the royalties to marketing the plants have created new value for breeders, growers and the retailers. And gardeners are getting better plants.

Another driving force behind the development of new shrubs was the rapid growth of the perennial market. Perennials helped to grow a new crop of gardeners, particularly women gardeners. Before perennials, the yard was mostly a man’s domain. As perennials came into vogue women learned that the garden could be more than just annuals and that gardening was not as complicated as the books and magazines make it out to be. As the perennial market matured, shrubs were the next natural step. After all shrubs are perennials, they just happen to have woody stems. The advent of container grown shrubs also helped the cause. Clean and reasonable in size, containerized shrubs met the needs of today’s gardener.

Lastly, success drives success. The success of new shrubs has awakened plant breeders, nurseries, retailers and gardeners to the value of flowering shrubs. Reblooming Viburnum, dwarf Clethra, ground covering Forsythia, yellow Spiraea, purple Sambucus, dwarf Buddleia and reblooming Syringa are just a few of the recent advances. It often starts with one new plant and builds rapidly. When I was in college some 25 years ago people laughed at me for putting Clethra alnifolia in a landscape plan. Then along came Clethra ‘Hummingbird,’ the first dwarf form of Sweetspire. It was an obscure plant that Fred Galle of Callowway Gardenshad discovered and for the most had part forgotten. Then Richard Feist, an Callowway intern at the time, saw the plant and bells went off. With the permission of Galle he registered the plant as Hummingbird and then wrote an article in Field Notes. All of a sudden Clethra clones start coming out of the woodwork; ‘Rosea’, ‘Pink Spires’, ‘Creal’s Callico’, ‘Fern Valley Pink’, ‘Hokey Pink’, ‘Cottondale’, ‘September Beauty’, ‘Ruby Spice’, ‘Sweet Suzanne’, ‘Sixteen Candles’, ‘White Dove’ and ‘Sherry Sue’ just to name a few. And so it goes with most species. Just wait until you see the next generation of reblooming Hydrangea macrophylla. Dr. Michael Dirr and breeders around the world are working like mad to improve upon Endless Summer. And so it goes, we are all winners because plants are improving at an exponential rate.

New and superior plants and the fundamental changes taking place in the market represent opportunities for nurseries and garden centers. There is real unfulfilled demand for superior varieties and consumers are willing to pay extra for them. The most commonly asked question I hear from retailers and from gardeners is “Where can I find them?”

In my next post I will list some plants that have had or will have a significant impact on the shrub market. These plants are changing the way we view shrubs. Check back next time and find out how many of these plants you know.

More Notes From France


Forsythia has a Bright Future


One of my favorite nurseries in France is Pepinieres Minier. Located in Loire Valley, the nursery dates back as far as 1838. Since that time it has grown into one of the leading nurseries in all of Europe. While they grow a wide range of garden plants, they specialize in Hydrangea, Magnolia, Syringa (Lilac) and in Hibiscus (Rose of Sharon). Violet Satin Hibiscus and Rose Satin Hibiscus are two many outstanding plants developed by Minier.

The driving force behind the nursery is Jean-Paul Davasse, a quiet, unassuming man that just happens to be a first rate plantsman. Not only does Jean-Paul oversee 270 employees and some 250 hectares of production he make the time to manage Minier’s breeding program.

Our recent visit to Minier took us back their superb display garden and as always, Jean-Paul beamed with excitement as we zigzagged the garden looking at their newest acquisitions and breeding work. Fortunately spring came early to the Loire this year and we were lucky enough to evaluate his Forsythia collection.

While Forsythia is not their specialty per say, Jean-Paul has a keen interest in the plant and has been actively breeding the plant for some time. The gem of the collection was his own development, Show Off (Forsythia ‘Mindia). This beauty originated as a sport from the compact, variegated cultivar ‘Fiesta’. There are several notable attributes that makes Show Off special; in the spring it is loaded with very bright, very large flowers that emerge from the base of the plant to the very tips of its branches. Most forsythia plants grow indeterminately, and thus flower buds often fail to form on the late season growth. Show Off seems to have no such problem. While outstanding in the garden, Show Off is especially showy in the garden center. It shines in a three gallon pot compared to other selections. This plant is also quite attractive later in the season because of its compact form and its unusual dark green leaves. The leaves are darker than any other cultivar and distinct in shape as well.

After the garden, we had the great pleasure of evaluating his latest crop of unnamed, unreleased forsythia seedlings. He had narrowed the breeding work down from 3,000 seedlings to about thirty selections. These selections were now in three gallon pots, as well as, in field plots. The evaluation process is the most exciting part of the breeing process. It is also the most difficult part – so many beautiful plants to choose from and you have to narrow the field down to one or two plants that are significant and worthy of introduction. In other words, you have the fortitude to throw plants away! During our evaluation we looked at flower size, flower color, plant density, dwarfness, the flower bud density and overall presentation. So many superb plants, but clearly one or two unique and superior selections rose to the top. Plants destined to have a bright future.

Some say that Forsythia is old fashioned and over used. Some would even say it’s boring - but I strongly disagree. And if you were in my shoes this day, evaluating Jean-Paul’s plants, you would feel as I do - forsythia has a bright future.

The “Apocalypse” at the Chateau d' Angers


In many ways I am fortunate that I have a job that takes me around the world looking for new plants, but many people including my wife think my travels are vacations. Contrary to popular belief, I do work very hard on these trips. It is not uncommon to visit nurseries and breeders from sun up to sundown for seven days straight. And in all my travels, I have yet to see the Eiffel Tower, Big Ben, or the Red Light district in Amsterdam.

That being said, once in a while we do find ourselves without any appointments, and if we can’t find any garden centers in the area; we do take in the local sites. We had such a day while in Angers, France. We took a day off to visit the Chateau d’Angers, a fortress that dates back to the 13th century.

While castles in France are as abundant as wine, it was highly recommended that we visit the Chateau d’Angers; - not so much for the building itself, but rather to see the tapestry. Housed within this fortress is the “Apocalypse,” the oldest tapestry of its size in the world. Commissioned in 1373, this fantastic work of art measures a massive 10,764 square feet in size. It is made up of 70 individual panels that, when viewed as a whole, tell the pictorial story of Revelation, the last book of the bible.

As you can see from the images below, this is an exceptional work of art. And in my option much more remarkable than the Eiffel Tower, Big Ben, or the Red Light district.

The Apocalypse tapestry - Angers, France


The Apocalypse tapestry - Angers, France


Hunting for plants has its rewards


Hunting for plants has its rewards. Dale and I just returned from a week long excursion to Northern France that took us from Angers, located in the center of the Loire Valley, north to the shores of Normandy. This begins the first of a series of short entries designed to make you all envious and jealous. Ah ... but that is the point – if I can convince you to leave the crowds and tourist traps of Paris for the magical French countryside - my job is done. Here you will come to know and love France. Skip Paris, are you mad? Yes I’m serious - think about it – do Europeans come to know America by visiting Los Angeles? I think not, so why not apply the same logic in our own travels abroad.

Guided by a beautiful French speaking woman that repeatedly shouted out “Tournez a gauche,” the handy GPS guidance system delivered us to the small village of Juvardeil located just north of the city of Angers. Here we set our base camp at the Chateau de la Buronniere, a quiet B&B with wonderful off-season rates. It is hard to say what was better, the majesty of the chateau or our sparkling innkeeper Willemien Van der Nat Verhage. Hard bread, dark coffee, and strong cheese greeted us each morning, while cold beer, red wine and assorted appetizers welcomed us home at night.

The Chateau de la Buronniere was, for the most part, built in the late sixteen hundreds, in the era of the Palais de Versailles. Parts of the home date back as far as 1450, and today it has no telephones, television and during our visit no other guests. We felt as if we had stepped back in time. What must it have been like to be the Sybille de la Buronniere, the original family of the chateau, living in such a grand house? Willemien told us that it was common then to entertain and to have numerous friends and guests for the summer months. There were no highways, cars, motels, televisions or x-box - but rather family, friends, food and good wine. Simple conversation, garden walks and fancy balls were the entertainment of the day.

For us, it was the perfect place to begin our plant hunting sorties into the rich Loire valley, home to numerous vineyards, pépinières (nurseries) and le Salon du Vegetal one of the most interesting horticultural exhibitions in Europe.

Kerria deserves a Second Look



Kerria japonica, The Japanese Yellow Rose, has been around for a long time. It has been sold for years, most commonly by low end mail order companies. For whatever reason, wholesale growers and garden centers rarely include this plant in their mix, and I wonder why? The more I see of this plant and what it can do in the landscape, the more I feel it deserves a second look. Please join me.

Kerria japonica is a hardy (Zone 5) deciduous shrub that matures at 3 to 5 feet in height. It's a dense mounded plant with numerous slender, zig-zagging branches that emerge at ground level. The beauty of Kerria is found in its flowers, stems and foliage. The bright yellow flowers are noticeable reminiscent of an old fashioned rose with its 5 petals. The flowers clearly make this plant a member of the Rosaceae family. In early spring, before the leaves emerge, the numerous yellow flowers create a colorful show. As an added benefit, Kerria will often rebloom off and on all summer long. The effect is beautiful and rewarding. Kerria is also blessed with attractive ornamental stems. From autumn to spring, its bright kelly green stems create a wonderful, fresh impression. Having visited the Cincinnati Zoo and Botanical Gardens in early spring a few years back, I distinctly remember big green drifts of Kerria. I was surprised and delighted to see it used throughout their beautifully landscaped grounds. Around every corner we were greeted by a mass of bright green. This unique combination of color and zigzagged lines creates a lasting impression.

You also have to appreciate the clean and simple foliage of Kerria. The leaves appear birch-like at first glance with its narrow triangular shape, but unlike birch, its leaves are brighter, doubly serrated, and display a pronounced puckering between the leaf veins. Always clean and green the foliage is a distinctive asset.

Culture


This is not a fussy plant that is difficult to grow or manage. Quite the contrary, Kerria is happy in most any reasonable well drained soil. It requires little fertility, and seems to flower best if neglected. Unlike other members of the rose family, Kerria has no serious insect of disease problems. The remarkable thing about this is that it thrives when grown in partially shaded to fully shaded locations. Few plants flower this well in shade! Full sun is also an option, but it does present a few problems. The flowers do not hold up as well and it can show some stem die-back if exposed to winter sun. Neither of these problems are severe, but both can distract from the beauty of the plant. It should be noted that this plant dislikes heavy, poorly drained soil. It will languish and grow smaller by the year. As far as ongoing maintenance, I personally feel this plant benefits from an occasional hard pruning. Cutting the plant to the ground produce a fuller plant, brighter stems and improved flowering.

The Cultivars

The most popular cultivar of Kerria is the old fashioned double flowered form, Kerria j. 'Pleniflora'. Its yellow button-like flowers resembles a chrysanthemum, and at peak bloom they polka dot the plant to create a distinct look. Kerria 'Pleniflora is not one of my favorite plants. To me it looks too contrived. I much prefer the simplicity of the single flowered forms. Two of the best single flowered cultivars are 'Honshu' and 'Golden Guinea'. I can detect only slight and inconsequential differences between these two plants. Both were selected for their large single flowers. If I had to choose only one of them I would pick ‘Honshu’ because its flowers are slightly larger and they have a soft and pleasing fragrance. The plant was introduced by Dr. Clifford Parks of Camellia Forest Nursery in Chapel Hill. Many people choose 'Golden Guinea' strictly because of its name. The name properly describes the size and color of the bloom. No the name Guinea does not refer to a bird or some exotic country, it refers to a large gold coin.

For those of you who need even more excitement in your life, several variegated selections are available. The best variegated type is called Kerria japonica 'Picta'. Not a great name, but a very good plant. Its leaves are graced with a creamy white margin that is not at all offensive like some variegated plants. The overall effect is very nice, and a decent specimen garners much attention. It does have its shortcomings. It can be slow growing when young making it difficult to produce especially when compared to the species. It also has a tendency to throw an occasional green shoot, which must be removed. This is a simple task and most gardeners would gladly pay this price to have such an interesting plant. I have seen another variegated clone under the name of 'Kinkan' or 'Auro-vittata'. This is worthless selection best left to the most ardent collector or relegated to the botanic garden. This "beauty" has green and yellow striped stems that tend to revert at the speed of sound and has small single yellow flowers.
While all Kerria selections have yellow flowers; the cultivar ‘Albaflora’ has blooms that are a near white, butter yellow. The color is more subtle, and I my opinion more pleasing to the eye than the typical bright yellow of the species.

Kerria is a beautiful plant with year long interest. Plant it in mass in a shady location and I think you'll be pleasantly surprised how nicely this plant performs. Very few flowering shrubs perform so well in the shade and you'll love the winter effect provided by its bright green stems.

Viburnum nudum: Close to perfection


Brandy Wine over three seasons

Possiumhaw or smooth witherod viburnum (Viburnum nudum) is a little known and underutilized shrub that is native from Maine and Florida and west into Texas. This is a remarkable shrub for several reasons; most notably for its attractive leaves that are so glossy you might think they’d been sprayed with leaf shine. As an added attraction the leaves turn to an eye-catching rich burgundy in autumn.


While attractive from a distance, the creamy-white, spring blooms are a bit uninteresting compared to other, more showy or more fragrant viburnums. To me its musky odor is neither pleasing or offensive - yet in late spring, the overall flower display is a welcome site in any garden. More importanly the flowers should be praised and respected for they give birth to an breathtaking fruit display that is unrivaled in the plant world.


In late summer the immature green, pea-sized berries (technically drupes) begin their metamorphosis - changing to shades of bright pink and then on to hues of bright blues and wild grape. The transformation is unsynchronized and yields large clusters of polychromic berries more showy than Donny Osmond’s dreamcoat.


Brandywine has colorful berries


While there is no such thing as a perfect plant, this one comes close. Still it is not suitable for all gardens. The species will not thrive on chalky or alkaline soils. In the North Eastern, U.S., Viburnum bark beetle can be a problem for this species, but fortunately these buggers can be controlled without chemicals. 


So how can such a beautiful plant escape full-blown stardom? As is the case with many Viburnum species, fruit set mandates that two distinct varieties (clones or ciltivars) are grown in close proximity to cross pollinate. And until the recent introduction of Brandywine™ (Viburnum nudum ‘Bulk’), most growers offered one cultivar called ‘Winterthur’ and it never set fruit. Brandywine was introduced by Proven Winners so that  there would be two selections available and thus allow for fruit set. It turns out, however, that Brandwine will set fruit without the need for another cultivar near by to cross pollinate. I have grown this plant for over four years and it has set fruit with a companion. 


Brandywine Fall color 

Brandywine Viburnum is hardy from zone 5(4) to 9. It prefers full sun to partial shade and moist, but well drained soil. It matures at a height and width of 5-7 feet. Once established it requires very little care yet offers so much more in return. 

The Gift: a passion for plants

While I spend most of my time looking for new plants, today I discovered some plants that were old but personally significant. My father sent me an email with a link to a website called Penny Postcards. On this site you can view old postcards arranged geographically by state and county. My father directed me to the cards for Linn County, Iowa. Here I discovered beautiful postcards of gardens designed by my late grandfather William Wood, the former manager of parks for Cedar Rapids, Iowa.

I’ve never met my grandfather. I am sad to say he died before I was born, but I do feel a closeness to William for like my father and me, he was a plantsman. He was trained in England as a true master gardener before he immigrated to the town made famous by Quaker Oats. I have visited the parks of Cedar Rapids many times and with each visit I was warmly greeted with the smell of cooked oats and the lasting remnants of William’s handy work; the Ellis Park golf course, the ruins of an old Shakespeare garden and trees planted by his caring hands. No, I have never met my grandfather, but still, I have come to know him. He loved plants and gardens, and he had a desire to share his passion with others, and that is the gift he gave to me.

Now you can subscribe to the Plant Hunter and get your updates by email.