Thursday, September 4, 2014

Living Green Roofs

Prairie Grass Roof
Walking Mountain Nature Center
Avon, Colorado
It may not be readily apparent, but road warriors can have a green side.  Topside that is. The Ford Truck Plant in Dearborn, Michigan manufactures large scale, gas loving pick up trucks beneath a roof covered with live sedum plants.  Ford's green roof is a pasture of 10.4 solid acres of sedum which benefits both the environment and the economy.

Ford's green roof was one of the first large-scale commercial projects of its kind and has been benchmarked by an industry leaning towards greener practices. 

Not only industrial facilities can benefit from living roofs overhead.  Residential homes and even garden sheds have incorporated plants into construction design. The primary benefits of a green roof for the site owner are improved insulation against heating and cooling loss and rainwater run off absorption. 


Sedum Roof, Ann Arbor, Michigan
Sedum is the gold standard for green roofing due to the groundcover's ability to absorb rainwater.  The succulent fills in quickly, survives extreme cold and windy temperatures and doesn't require pruning or cutting back.  Prairie grass is sometimes used as an alternative, but in the wrong setting can dry out or overextend.  Visually, sedum generally appeals more to the eye.  Ideally, the roof should incorporate a more diverse collection of plants, but sedum can be a bit pushy.  

Low maintenance sedum sports a shallow root system, tolerates drought, resists disease, adapts easily to environmental challenges, and requires no supplemental nourishment.  Yet, any significant installation design should include an expert's opinion as the vegetation blanket's weight increases as the plants grow, multiply and absorb water.

There are thousands of varieties of the stonecrop species.  The most suitable are short and compact as tall species can suffer breakage.   If aesthetics are part of the equation, available sedum colors range in color from bright yellow, to green to burgundy red.

New York City offered tax abatements for developments sprouting living roofs. 

Grass roof
Avon, Colorado
Are plant based roofs truly beneficial?  There's no solid evidence either way.

One thing's for certain, sedum plants won't limit themselves to the roof.  The spreadability factor which makes stonecrop so attractive for roofs doesn't end at the gutter.

Expect sedum to reseed at ground level.

More Articles of Interest:

Fall Garden Clean Up and Pumpkin Patches

Turtlehead and Other Fall Blooming Plants

Sunday, July 20, 2014

Lafayette Greens--Detroit Grows Up!

There's no place like Detroit.  Where else can so many folks "be" from a place where they've never
lived? Detroit's got lots of citizens, but few inhabitants.





It's tough to visit other cities who seemed to "get it."  Even places like New York, whose existence hasn't always been pristine, have made repurposing neighborhoods nearly an art form.  Abandoned New York Central train tracks now wind through a revitalized warehouse district reborn as a mile-long linear park. 

In Detroit there's always been the desire for a true urban experience, but for most of my lifetime all well intentioned attempts eventually fell flat. There's certainly a deep loyalty, and a conflicted love for the grimy city, but things never seemed to change. What did change was generally not for the better.

Boomers set their sights on the suburbs. 'Detroiters" who never grew up in the city.  Few forayed into the city even during the work week, the main occupants of downtown being barristers and bums.  Some bragged that they hadn't been to Detroit since the Tigers last won the World Series--never specifying which one.

Michigan has a stellar university system, so when the first batch of offspring began graduating with impressive credentials, they found there were no jobs, especially in Detroit.  Thus the exodus of the first half of a generation--to Chicago, New York, Atlanta, and other urban areas that had job vacancies, and a throbbing metropolis.  Meanwhile something was percolating with our offspring that never dawned on their middle aged parents. 

 
Those young adults who'd spent internships or began starter jobs in neighboring cities came home and created their own urban experience.  Others just stayed put.

Today, over the lunch hour, the typical worker on  the sidewalk of Detroit wears Dre Beats and sports a messenger bag.  Prada pumps seem pretentious and out of place. 

Thus, upon exiting the courthouse on a mild summer mid morning with my resident twenty something barrister daughter, we snuck off to the Coney Island--and upon a sight that made my green heart sing.  A lovely urban garden had sprung up on the long end of a triangular block where a fourteen story abandoned building once crumbled. 

Lafayette Greens is serious urban gardening.  It features rows of raised garden beds made from galvanized steel. The beds are designed as accessible and barrier-free.  The site is beautifully designed in a sustaining style.   Detroit was designed by Augustus B. Woodward in the style of Washington D.C., with the city center as the hub of a wheel, and the streets as spokes.  Makes sense for a Motor City.  The layout of Lafayette Greens makes comparable use of circular shapes and
patterns, interspersed with linear rows of raised gardens, each assigned to a willing sponsor.

The garden is active all year, with the planting of cover crops in off season and the use of "low tunnels" or winter greenhouses. 

Intense and undistracted young people in bright t-shirts huddled together over raised beds as if at a conference table.  Later in the day, they will likely sit indoors with the same look of purpose, fielding overseas calls and customer inquiries.

City dwellers chatted at bright umbrella tables. 

The Greening of Detroit manages the site. 

For a city that has  stared down the abyss, this green means rebirth. The contrast's refreshing and  the feeling's revitalizing.

It's worth the trip to the Greens.  And next door for the coney dog.

 
MORE BLOGS OF INTEREST:

Urbane Wildlife -- Look What Roamed In!

New USDA Planting Zones -- The Blog Formerly Known as Zone Five and A Half

Wednesday, June 11, 2014

Boxwood Burn

Why are the boxwood bushes brown?  Can the hedge be saved?  Should I cut it back?

He looked perplexed, staring down the curved lines of  brown shrubs along his driveway. Last year lush green boxwoods outlined my neighbor's entryway. Now Ray's trying to decide whether to rip them out or hurriedly deploy a can of green spray paint before the weekend  graduation party. 

The great Polar Vortex of 2014 may be a distant chilly memory, yet many tender hedges are not recovering. The extended deep freeze was just too much.  It wasn't that the temperatures plummeted so low--but for so very long.  Hedges situated in areas with excess wind exposure sustained the most damage.  Unfortunately those locations are often the most prominent.

Mild winters emboldened growers to introduce new varieties of the emerald green beauties, although many had no track record in volatile zones five and
six. Then Mother Nature decided to get brutal in 2014.

Winter burn is desiccation or complete dehydration of plants stripped of all moisture by winter winds and harsh temps. The leaves dry out, turning gold or a pale beige.  This is normal on a small scale every year, but in 2014 the extensive damage was unprecedented.

Those shrubs in sheltered areas or buried beneath snow fared the best.  But most hedges sustained sectional injury.

The hopeful (or those of us in denial) waited six to eight weeks for the plants will shake it off.  By now, if more than half the shrub remains beige to brown, the prospects are not good.

Mild external trimming may clean it up, but if the damage extends inward more than four to six inches, the prognosis is mixed. Separate the branched and peer into the plant. If the burn is isolated on a few branches, cut back to a live "y" junction.  Burned limbs will not bounce back so remove them.  Boxwoods will fill in if the end result resembles Swiss cheese. Nitrogen based plant supplements will stimulate growth. 

Hard cutting back is not a fix.  Boxwoods whacked with deep brush cuts will not regenerate sufficient
thickness to achieve their signature appearance of continuity. 

Learn from this winter.  It's hard to match up replacement shrubs.  When planting a new hedge, purchase a few extra shrubs, tucking them away in a sheltered area of the yard.  Never know when a relief pitcher is needed. Otherwise, the entire hedge may need replacement or consolidation.

Keep the hedgerow shrubs well hydrated late into the fall to avoid drying out.  Discontinue fertilization in mid summer.  Tender new growth is most vulnerable. Shovel snow along hedges, being careful not to overload the flat top with weight.

With a little special care and precaution,  boxwoods will bounce back.

After all, last winter was an aberration.  Right?????!

MORE ARTICLES OF INTEREST:

Green Fences--Boxwood Hedges to Hydrangea Hedgerows

Planting Windowboxes -- No Pane No Gain!