March / 2002
At Home in the Garden

Designer hedges
by:  

It's funny how you garden contently for years and then in an instant decide to take a new approach.
At a recent garden lecture I sat quietly in my chair while everyone around me furiously took notes. I am generally a note-taker myself. This time, however, I just watched, enjoyed, and left with a blank notepad and a desire to have something I had never had before-a decorative, intricately pruned hedge.
The hedge that inspired me didn't look like a conventional hedge at all. It was a living fence with beautiful arched windows. Sculpted from Carpinus betulus 'Columnaris'-Columnar European Hornbeam-it served to frame a small courtyard garden just off a house.
When we hear the word hedge, our imaginations tend to start and stop with the thought of a solid evergreen wall to hide the neighbors. But consider a hedge that is deciduous, a hedge that is not solid, or simply planting a hedge just for its beauty.

Hedge Considerations
You can make a hedge from most any plant, but you also need to consider the location, ultimate size, purpose of the hedge, and your ability to maintain it.
Is the location you have selected sunny or shady, sloping or flat, wet or dry? It must be appropriate for the site so that it will grow and thrive. Next consider the sizes of any other features in the area where the hedge will be planted, such as the height of any fences, walls, or other large plants. Make sure it is in proportion with these elements, not competing with them.
An important question to answer is what purpose will the hedge serve in the garden? Will it need to screen out the neighbors 12 months of the year or just during pool season? Is it to enclose a space, frame a part of the garden, provide a minor visual buffer, or simply serve as decoration?
Perhaps the most important question to address is one that you must answer with brutal honesty: what is your ability to maintain the hedge? Your maintenance ability is measured in several ways: how much time you have or are willing to give, what equipment or tools are required and whether you can operate them comfortably, and what you can physically accomplish. For this reason alone I decided to plant and maintain my decorative hedge at around 7 to 8 feet. I hope that my hedge will last forever, so I am considering that as I get older my ability and stability on a ladder will decline. So I chose a height that I could comfortably maintain by pruning from the ground. As my hedge approaches the ultimate height of 8 feet I will use a small poll pruner to reach the top.

Hedge choices
This brings us to the fun part: what plants can we use to make a hedge?
For the hedge that changed my thinking at the conference, Columnar English Hornbeam was a good choice for its location because a beautiful garden lay on the outside of the hedge. Its deciduous character and arched windows allowed you to catch glimpses of the garden beyond. This hedge was maintained at about 10 feet, so a dwarf or columnar slower-growing plant selection was ideal to allow for maximum beauty with the least amount of pruning. Imagine trying to keep a tree that wants to be 75 feet tall to a height of 10 feet by pruning. That's a lot of pruning-certainly more than even many experienced and dedicated gardeners would dare.
Some plants respond well to the heavy pruning required to form and maintain a hedge while others do not. If you select a plant but are unsure it will tolerate hedging, consult your local horticulturist before making the investment.
You can find a list of 10 suggested plants for evergreen and deciduous hedges in a longer version of this column, on the Internet at www.KentuckyLiving.com/hedges.htm.
But don't limit yourself to my list. There are many more excellent plants to choose from.
In the United States it seems our lack of patience is making an instant landscape as popular as fast food and neither is designed for a long and healthy future. A hedge can't be achieved instantly; it takes time, care, and patience. Start with small manageable nursery stock, plant correctly, train them well, and enjoy them for a lifetime.

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