The deer population in Pennsylvania is on the rise.

As land development increases, deer are frequently found in areas densely populated by humans.

Deer control is now one of the biggest challenges for home gardeners. Deer are North America’s largest garden pest, and they can wreak havoc in the garden.

Deer feast on vegetable gardens, flowerbeds, shrubs and trees. They will graze on leaves, grass, bark, acorns, fruits, nuts, berries, lichens and fungi.

On average, a single deer can consume five to 10 pounds of plant material a day. They are efficient and clever at accessing food sources. Some of their favorites include apples, yews, rhododendrons, arborvitae and hostas.

Deer tend to feed at night and usually remain awake until dawn. When confronted, deer will typically bolt if they sense danger. Yet, they can grow at ease with people, pets or cars that appear as no threat.

Many gardeners resort to various methods to keep deer from decimating the garden.

One effective way to keep deer from eating your harvest is to install a fence. Deer can sometimes hop over an eight-foot barrier, so non-electrified fences will need to be at least that high.

There are deer repellent sprays and granules on the market. The deer repellents available at most garden centers use natural ingredients that are offensive to the deer’s sense of smell and taste. They are often safe to use on shrubs and flowers when applied according to label instructions.

For food crops, be sure to select and purchase a product that is labeled safe for use on fruits and vegetables. Many products claim to not wash off after rainstorms. Rotate the use of the various repellents for maximum protection.

Highly-scented, deer-resistant plants, including boxwood, rosemary and lemon thyme, can be planted among plants deer like.

Other deterrents include a homemade spray made of a beaten egg, garlic powder, cayenne pepper, dish soap and cooking oil mixed in water. The foliage of the plants must be sprayed every couple of weeks, and, if it rains, the substance must be reapplied.

There are plants that deer generally do not eat.

Try planting annuals such as marigolds, sweet alyssum and salvia.

Perennials that deer tend not to eat include daffodils, hyacinths, columbine, ferns, yarrow, foxglove, lavender, peonies and iris.

Tree and shrubs that deer usually avoid include bottlebrush buckeye, red bud, ginkgo, shadbush and pawpaw.

Almost all flower and vegetable plants can fall prey to deer. Whether or not a particular plant species will be eaten depends on the deer’s previous experience, nutritional needs, plant palatability, seasonal factors, weather conditions and the availability of alternative foods.

Deer are creatures of habit, and they have good memories and learn from each other. Their movement patterns and prior foraging can predict where damage may occur.

By carefully planning your garden, selecting those plants least desirable to deer and the use of physical deterrents, you can enjoy your garden along with the deer that inhabit the area.

The Great Allentown Fair:

The Fair runs Aug. 30 through Sept. 4. The Penn State Master Gardeners will have a booth in the Agri-Plex where you can ask all your gardening questions.

Master Gardener Coordinator Joe Veshinfsky is giving a talk, “Growing A Tomato and Pepper Salsa Garden,” 3:15 p.m. Aug. 31, and “Growing Dahlias,” 4:15 p.m. Aug. 31, Centennial Stage, Agri-Plex, on the Fair’s west end.

It is also a great time to check out the fruits, vegetables, flowers, Christmas trees, nuts and so many other items on display in the Agri-Plex. You might see something different that you want to grow next year.

“Growing Green” is contributed by Diane Dorn, Lehigh County Extension Office Staff, and Master Gardeners. Information: Lehigh County Extension Office, 610-391-9840; Northampton County Extension Office, 610-813-6613.