The Native Plant Garden: Pruning Prairie Dock Prevents Problems

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2010: This is so awesome, hey is that a storm on the horizon?

As its name proclaims, Prairie Dock (Silphium terebinthinaceum) is native to the tallgrass prairie of North America, and is a must have for the sunny native plant garden.  The spade shaped leaves are big and bold – a nice contrast to the grasses and other prairie plants – the look is almost tropical.  And the flower stalks on Prairie Dock can get wicked tall, 6 to 8 feet tall. 

For the first couple of years, I looked forward to this amazing feat, as the flower stalks grew taller and taller on the Prairie Dock planted along my driveway.  It would be the end of August, and just as the flowers began to open, a windy summer storm would move through and take down the stalks, leaving them sadly leaning at a 45 degree angle.  And, always, they fell towards my neighbor’s driveway. No good.  It was bad enough, true to their name, that all of the flowers faced south, towards the sun and my neighbor, and away from my view.

I could have staked the stems.  Too much work.  I decided to just cut off the flower stalks when they began to emerge in early July – the flowers where nice, I thought, but just did not work in a garden setting – the stems got too tall for their own good.  To my surprise, a new set of flower stems soon began to re-grow from the plant. 

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Early July, just before the flower stalks were pruned off.

These, however, never got as tall (only 4 feet or so) and therefore did not get so top heavy as to flop over in a wind storm.  Incredibly, they flowered at the same time as the Prairie Docks in my backyard meadow that were not cut back – and they looked great – more flowers than on the taller stalks – bonus!

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2013, Early September.  Other than the Baptisia ‘Twilight Prairie Blues” crowding out the Prairie Dock, all is well in the prairie garden.

The stems were cut back to the base of the plant.  As mentioned, the flower stalks could also be tied to stakes driven into the ground to help support them, but I actually like the shorter flowers stems in the garden setting that result from the early July pruning.

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A little tough love for the Prairie Dock – it’s for the best, really.

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Roy Diblik Designed Garden at The Grand Geneva Resort & Spa

 

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Opened in 1968 as a Playboy Club Hotel, the Frank Lloyd Wright inspired architecture of The Grand Geneva Resort & Spa lends itself well to the Roy Diblik designed entry garden.  Installed in 2005/06, the garden evokes a Midwestern meadow full of bright flowers and billowing grasses.  While not all of the 20+ species of perennials in this garden are native to the Midwest, most are not, Roy has shown, that “it doesn’t have to be all natives” to be sustainable.  The garden does reflect a growing need for sustainable landscape design and creates an emotional connection for the viewer through “Representation of Place,” as Roy puts it.

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According to Roy, ecological plantings are where landscape design needs to be.  He would like to see an end to monocultures of Black-eyed-Susans and Purple Coneflowers, which too often leads to disease and death, as well as the “weed, woodchip, and replace” mantra of the landscape industry.  Instead, he would like to see well designed landscapes, consisting of stable communities of plants, that are sustainable and create a pleasant garden.

Roy Diblik’s plantings are dense enough that weeds cannot compete with the perennials.  He also believes in keeping the soil lean:  “A lean soil supports fewer weeds.”  Additionally,  he feels that adding wood chips is not something that promotes plant health in perennials and should not be needed if they are happily growing in “closed, stable, communities.”   He does, however, occasionally use leaf mulch in some of his gardens, for example, his gardens at the Art Institute of Chicago get an application of leaf mulch every three years.

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As can be seen in this garden, Roy keeps the plant palette limited (I counted approximately 20 species of plants), repeats many of the plants throughout the garden, and chooses plants the “respect their space.” 

Roy has mentioned in his presentations, that the designer needs to consider the size and habit of the plants 3 to 5 years after planting, and that gardens need two years of nurturing, before gardening can begin.  The old horticultural saying about perennials is that the first season, they “sleep,” the second year, they “creep,” and the third year, they “leap.”  Roy plants in expectation of the third year, and beyond.  But he is not a believer in “one and done,”  rather, a garden (or landscape project) should be thought of in phases, and changes or additions should be planned for, in time.

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In the above picture we see approximately a half dozen perennials repeated, each grouping knitted into the next, not simply one grouping next to another grouping.  In the foreground, Allium angulosum  ‘Summer Beauty’ ties into the yellow ‘Happy Returns’ Daylily, which in turn runs into the purples of various Veronicas.  The seed heads of June blooming giant allium bulbs are still visable, and are part of the aesthetic of the garden.  The bright green grass, Sesleria autumnalis,  Moor Grass, fronts the walkway in the bed at left and complements the blue-green leaves of the Catmint, Calamintha nepeta ssp. nepeta, behind it.  The Catmint as well at the ‘Summer Beauty’ Allium can be seen repeating in the rear of this image, as well.  Spots of Stachys officinalis ‘Hummelo’ add a touch of royal purple to the mix.

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In the largest section of the garden, the mixture of ‘Summer Beauty’ and Catmint can be seen with a large swath of purple ‘Hummelo’ behind, along with the taller Purple Coneflower, the misty blue Russian Sage, and the yellows of the ‘Happy Returns’ Daylilies, Coreopsis, and Achillea.  In the distant background is Calamagrostis x acutiflora ‘Karl Foerster’  Feather Reed Grass.  Various blue Salvias, past flowering in this photo, played a major color roll, earlier in the season.  Plant shape, texture, and height play as much of a roll in this composition as does the color of the flowers.

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Above, Sesleria autumnalis,  Moor Grass; Calamintha nepeta ssp. nepeta,  Catmint; Salvia‘Blue Hill;’ and  Stachys officinalis ‘Hummelo,’ growing together as part of a happy and beautiful plant community.

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Sporobolis heterolepis,  Prairie Dropseed Grass; Allium angulosum,  ‘Summer Beauty;’ and Echinacea purpurea,  Purple Coneflower, intermingle nicely along the walkway.

 

The Plants Seen in Roy Diblik’s Garden

at The Grand Geneva Resort & Spa:

·        Achillea x hybrida  ‘Coronation Gold’ ‘Inca Gold’  Yarrow

·        Allium angulosum  ‘Summer Beauty’ Allium

·        Allium purpureum bulbs

·        Allium schoenoprasum ‘Schnitlauch’ Dwarf Chives

·        Amsonia orientalis ‘Blue Ice’

·        Baptisia sphaerocarpa,  Yellow Indigo

·        Calamagrostis x acutiflora ‘Karl Foerster’  Feather Reed Grass

·        Calamintha nepeta ssp. nepeta,  Catmint

·        Coreopsis palmata,  Prairie Coreopsis

·        Coreopsis verticillata  ‘Golden Showers,’ ‘Moonbeam’

·        Echinacea purpurea,  Purple Coneflower 

·        Geranium x hybrida ‘Orion’  Hardy Geranium

·        Hemerocallis x hybrida  ‘Happy Returns’ Daylily

·        Kalimeris incisa ‘Blue Star’

·        Perovskia atriplicifolia,  Russian Sage

·        Rudbeckia fulgida,  Black-Eyed-Susan

·        Salvia  ‘Wesuwe,’  ‘Blue Hill,’ ‘East Friesland’

·        Sesleria autumnalis,  Moor Grass

·        Sporobolis heterolepis,  Prairie Dropseed

·        Stachys officinalis ‘Hummelo’

·        Veronica sp.  Speedwell

 

 

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Trains, Trees, and Trails at Taltree Arboretum & Gardens

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For the last few years, I have been wanting to visit the 360 acre Taltree Arboretum & Gardens in rural Valparaiso, Indiana.  I finally got my chance this past week.  This wonderful place was established in 1998 by Damien and Rita Gabis as a non-profit, educational institution.  The arboretum has several “areas” of interest which include: a new railway garden, woodland garden, children’s garden, native plant garden, as well as restored natural areas. Thirty acres of restored tallgrass prairie, surrounded by mature oak/hickory woods, as well as wetlands, brought back to life after many years of being part of agricultural fields, await the visitor.  Approximately 16 acres of former farmland was planted to oaks, and other trees native to the area, to create “oak islands.”  The natural areas have trails of varying length winding through them.  Some are paved, others have a natural surface of wood chips.  A map of the arboretum, available at the entry gate, provides information on trail locations, and length.

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Trails and Natural Areas

I hiked a half mile trail around one of the wetlands.  At the head of the trail is a butterfly garden, then a short distance on, some naturalized plantings surround a large pavilion, with limestone columns and a massive stone fireplace, overlooking the wetland.  Weddings are sometimes held under the shelter of the pavilion’s cedar shake roof.

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The Visitors Center and Railway Garden

My first stop, however, was at the visitors center/ Taltree Depot – the gateway to the railway garden and the location of restrooms, some food, and a giftshop.  The plantings surrounding the depot are young.  The model railway garden opened in 2011, and is quite impressive in its size and detail.  The attention to detail of this one acre, G-scale, model railway garden is truly amazing.  Scaled creeks, with rapids and waterfalls, run throughout the garden, with trestle bridges crossinging over them.  All along the way, small towns appears, a limestone quarry, even a Civil War Battle is tucked among the scaled down plantings and stonework.

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The Native Plant Display Garden

One of my interests was in checking out the native plant garden.  I always like to see how other designers utilize native plants in a garden setting.  What was interesting about this garden was its scale, both the garden itself, and the plants in it.  The raised portion of the garden included plants that did well in dry, sunny conditions.  All of these plants were, on average, shorter than two feet tall, and the small size of the garden made it easy to see how these plants could be used around a home, along a driveway, a patio, or even a sunny parkway bed.

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The garden is approximately 40 feet across and raised 18 inches above grade.  The garden is edged in quarried limestone and the paths consist of packed decomposed granite.

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Below, Leadplant (Amorpha canescens) is planted in combination with Little Bluestem Grass (Schizachyrium scoparium).  The blue-gray leaves of both plants exude an almost desert feel, as does the whole garden, which was fun, and different from most native plant gardens that I’ve seen.

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Next to another Leadplant was our Midwest native Prickly Pear Cactus (Opuntia humifusa).  The Opuntia has tissue-like lemon-yellow flowers in June, followed by red fruit, or “pears.”  The fruit, which is edible, is still green in the picture below, but can be seen at the tips of the cactus pads.

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Prairie Dropseed Grass (Sporobolis heterolepis) lined one part of the pathway in the garden.  Prairie Dropseed is a great “facer” plant.  It provides a neat, elegant, transition from taller plantings to lawn, or in this case, the stone pathway.

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The Large Flowered Penstemon (Penstemon grandiflorus) is another blue-gray leaved plant used in this garden.  While I’ve seen it growing in the sandy dunes along Lake Michigan, it is a native of the shortgrass prairies to the west of Illinois and prefers well drained soils.  True to its name, it has large, one inch, tubular, pink flowers in June, making them attractive to hummingbirds.

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Rough Blazingstar (Liatris aspera) had a very interesting airy form with round, knobby, flower buds, that will be opening in the next week or so; starting at the top, and working its way down the flower stalk over many days.

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Wild Petunia (Ruellia humilis) is an under utilized plant.  It was doing well in this dry, sunny garden, but I have also seen it grow, and have grown it, in much shadier gardens.  In flower, it looks good planted in a mass, however, it is probably best used informally throughout the garden, tucked among other plants, such as coneflowers or blazingstars.

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A close-up of the Wild Petunia:

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Just beyond the raised native plant garden, were beds of taller wildflowers, including this Cup Plant.  This had got to be the number one bird and butterfly attracting  wildflower.  It is also one of the most adaptable.  It is named Cup Plant, because of its ability of hold water where the leaf attaches to the stem.  I have seen goldfinches use this feature and come back again, once the seed that is produced is ready to eat.  Full sun or part shade is fine for this plant.  Use it where you need something big and bold, and place it in the garden where it can be seen from the house, so that the visiting wildlife can be viewed while sipping your morning coffee.

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The is a lot more to see at Taltree Arboretum & Gardens, than what I have shown here.  Many areas, including the children’s garden, with goats and chickens, are designed specifically to entertain and educate the younger crowd while being surrounded by sights and sounds of nature.  There are also music concerts throughout the summer months, yoga classes in the morning, and educational classes throughout the year.  This hidden gem is only a short drive from many large cities, including Chicago, and is a great way to unwind and experience nature’s wonders.

 

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