Butte County offers an abundance of beautiful places to live. Our urban areas are surrounded by farmland, open space, foothills and the Sierra Nevada and along with this wildland interface comes wildlife. Smaller creatures like squirrels, raccoons and opossums may raid your home fruit trees, but ask any gardener who lives where there are deer and they will tell you that browsing deer are their No. 1 gardening problem.
Deer can be destructive to home gardens, landscape plants and trees, orchards, vineyards and vegetable gardens. They not only graze along the ground, they can also stand on their back legs to reach young shoots and leaves from trees.
Deer are browsers. Their diet consists of semi-woody plant materials, grasses, forbs, fruits, nuts, shrubs, vines and vegetables. They feed in the late evening and early morning, but they can be active during the day. When food or water is scarce, they often start eating things they normally do not like.
The browsing damage can ruin young shrubs and newly planted trees by stunting their growth. Deer browsing may delay fruit set on young fruit trees. A group of grazing deer can demolish plants and hedges. In late summer, bucks in rut rub antlers against tree trunks to rub off the velvet (the vascular skin that covers growing antlers). They often rub hard enough to tear through bark and damage the cambium layer on tree trunks, and they may even break a small tree by snapping off its trunk.
Some strategies can be employed to help minimize the damage caused by deer.
Fencing is the most effective barrier, but also the most costly. If you are enclosing a small vegetable garden fencing can be cost effective, but if you live on a property with acreage this might not be the best solution. Deer can jump over an 8-foot fence. They can also slide underneath a fence that does not go all the way to the ground.
A shorter fence can deter deer if you place obstacles in their way. Deer do not have very good depth perception. Locating a compost bin against the fence, planting a tree, strategically locating tall bird feeders, benches or a bird bath can help prevent deer from jumping into the fenced-in area. In the vegetable garden you can place tall raised beds close together in a pattern that does not allow deer to gain easy access.
Individual plant protectors or barriers around trees and shrubs also work well, especially with new plantings. Wire fencing with metal stakes is one option; there are also tree guards made of various materials like rubber and vinyl that wrap closely around or encircle young trees to protect them from deer (and squirrel) damage. The barrier must rise high enough to protect the plant or tree.
Designing your landscape with a focus on hardscape elements like patios, walls and pathways helps distract the eye from the occasional damage done by browsing deer. Use nonedible focal points like water fountains or arrangements of plants in containers. If the deer eat some of the plants in the containers it is easier to replace them.
There is no such thing as a deer-proof plant, but some plants are more deer resistant than others. There are many plant lists available to help you choose the appropriate plants for your climate. The Sunset Western Garden Book has several pages of suggested plants. The El Dorado County Master Gardeners have developed an extensive list (you can find the pdf at https://ucanr.edu/sites/edc_master_gardeners/files/153014.pdf). And local nurseries have lists specific to our area that you can consult.
According to the University of California Agriculture and Natural Resources Pest Notes No. 74117, “if there is a surplus of native plants in and around your garden, ornamental plantings may be largely left untouched.” A good starting point is to choose native plants that are either textured or aromatic. There are dozens of attractive native plants that are also deer resistant. A small sampling of these includes Western redbud (Cercis occidentalis), Madrone (Arbutus menziesii), California bay laurel (Umbellularia californica), lilac (Ceonothus spp.), bottlebrush (Callistemon spp.), manzanita (Arctostaphylos spp.), yarrow (Achillea spp.), bleeding heart (Dicentra spp.), beard tongue (Penstemon spp.), sages (Salvia spp.) and ferns such as chain fern (Woodwardia fimbriata).
Use a wide variety of deer-resistant plants and layer them, placing larger plants at the back. If deer do stop by to browse, they may damage one or two plants but will move on without harming everything. In addition to native plants, you might try lavenders, sages, gaura, daffodils, sweet alyssum and ornamental grasses. Using plants with interesting or colorful foliage can also help. The deer will enjoy eating the flowers of these plants but might leave the woody plant material alone.
Deer tastes vary by region, season and availability. Fawns will often try things their mothers do not eat, just to see if they like them.
When designing your landscape avoid planting in deer migration pathways. Deer tend to make trails where they travel most. They will continue to use the trail and may trample what you plant.
Deer repellents can be purchased for use on your plants. Their effectiveness diminishes with rainfall, and they need to be reapplied after a period of time. What works in another region may not work in your region. Make sure to read and follow all the instructions. Repellents may not be suitable to spray on your edible plants.
Mechanical or moving devices that startle deer may work for a while, but over time the deer will get used to them. Dogs can also be a big help in deterring deer from visiting your garden.
The goal of deer-resistant gardening is to mesh defense and beauty together. By using a combination of deer-resistant strategies, you may find it easier to co-exist with these beautiful creatures.
Resources: The UC Integrated Pest Management Program provides a wealth of information on Deer management: see http://ipm.ucanr.edu/PMG/PESTNOTES/pn74117.html.
The UC Master Gardeners of Butte County are offering a workshop on Vertebrate Pests in the Garden on Saturday, March 14. It will cover strategies for dealing with deer, gophers and moles in the home garden. For a full description and the complete line-up of Spring Workshops, go to https://ucanr.edu/sites/bcmg/Workshops.
The UC Master Gardeners of Butte County are part of the University of California Cooperative Extension system, serving our community in a variety of ways, including 4H, farm advisors, and nutrition and physical activity programs. To learn more about UCCE Butte County Master Gardeners, and for help with gardening in our area, visit https://ucanr.edu/sites/bcmg/. If you have a gardening question or problem, call our hotline at 538-7201 or email mgbutte@ucanr.edu.