Native to western North America, Oregon grape holly is a broadleaf evergreen shrub that will grow wonderfully in the shadier spots of your garden. Grape hollies provide many different colors throughout the growing season. As new leaves emerge in the spring, they are red-tinted and mature to a shiny dark green in summer. Foliage will begin to change from dark green to a purplish color in fall and by winter grape holly will be a lovely burgundy-bronze color. The flowers of grape holly bloom around April and are a spectacular bright yellow color with a pleasant fragrance. The flowers are followed by edible blue-black berries in the early fall. These berry clusters resemble small clusters of grapes, hence this plant's common name.
If you want the berries, plant two or more shrubs. The tart berries can be used to make jams, jellies, and preserves. Grape hollies can be very useful in attracting wildlife to your garden, such as butterflies, bees, hummingbirds, and many other species of birds.
Oregon Grape Holly Overview
Where to Plant Grape Holly
Oregon grape holly does best in shade or woodland gardens with moist but well-drained, acidic or neutral soil.
The shrub can be planted as a single colorful accent plant or in small groups in shrub borders and foundation plantings. Grape holly is also useful as a privacy screen or native fence. But be prepared: after a slow start, this shrub grows fast, which can also create a somewhat aggressive plant. Be certain to check with local authorities to verify whether grape holly is a problem plant in your area.
How and When to Plant Grape Holly
Plant Oregon grape holly in the spring to give it a full growing season to get its roots established. Dig a hole at least twice the size of the root ball and just as deep. Place the shrub in the hole and gently spread out the roots. Backfill with the original soil so that the top of the root ball is flush with the soil. Tamp down the soil and water it well. Water it deeply and regularly during the first growing season.
Space plants 4 to 6 feet apart, depending on the mature size of the variety and the intended landscape use. To grow it as a specimen, give it more space. For a hedge or groundcover, plant them closer together, about 3 to 4 feet apart.
Grape Holly Care Tips
Other than containing its spread, Oregon grape holly is a low-maintenance shrub.
Light
As a woodland plant that grows under pine and firs in the Pacific Northwest, Oregon grape holly should be planted in part shade to full shade. If it is getting too much sun, the leaves may scorch.
Soil and Water
Oregon grape holly grows best in soil that is evenly moist and well-drained, with an ideal pH below 6.1 and no higher than 7.0. It does poorly in highly alkaline soils and will become chlorotic in high pH.
Water the plant deeply and regularly in the first growing season. Afterward, you can cut down on the watering. Oregon grape holly tolerates dry shade.
Temperature and Humidity
Oregon grape holly is hardy to Zone 5 but does best in a location where it is protected from strong winds, which can damage the foliage. The plant does not have any special humidity requirements.
Fertilizer
When planted in rich, fertile soil, Oregon grape holly does not need more than an annual application of a complete balanced granular fertilizer in the early spring before the new growth starts.
Pruning
Typically, Oregon grape holly does not need much trimming unless the shrub is spreading too much for your liking and you want to control it. Pruning should be done in early summer once the shrub has finished blooming. Suckers at the base of the plant can be removed at any time.
Potting and Repotting Grape Holly
Oregon grape holly is not typically grown in pots but it can be planted in a container that is deep enough to accommodate the deep long roots of the shrub. Select a container with large drainage holes and fill it with a combination of well-draining potting mix and organic matter such as compost. Keep in mind that potted plants need more frequent watering and fertilization than garden plants.
Despite its hardiness in areas with cold winters, when grown in pots, the roots of Oregon grape holly are exposed to the cold. As a protective measure, winterize the pots by sinking the container into the ground. You can also place the container in a second, larger pot to create a planting silo that will insulate the roots from the cold.
Pests and Problems
Oregon grape holly is susceptible to various fungal diseases including leaf spots and rust. Too much sunlight and strong winds can cause leaf scorch. In soil that is too alkaline, the leaves can look chlorotic and burnt but the plant usually recovers when the pH level is adjusted by adding a fertilizer for acid-loving plants. Pests like whiteflies, aphids, or scale can be treated with insecticidal soap.
How to Propagate Grape Holly
Oregon grape holly tends to grow suckers from which the shrub naturalizes and develops colonies if the suckers are not removed. Using suckers is the easiest way to propagate the shrub. It's less involved than growing it from seed, which requires cold stratification, and faster than using stem cuttings. This is best done in the late spring so the new plants have time to develop a good root system.
Locate the suckers which are usually at the lower part of the stem or near the roots. Using sharp pruners, carefully cut the root or stem that connects the sucker to the mother plant without damaging it. Plant the sucker in a pot filled with potting mix. This is preferable over planting it directly in garden soil as it lets you monitor the soil moisture better and the small plant won’t get lost among weeds. Place the pot in a location out of direct sunlight and keep the soil evenly moist. Transplant it in the landscape after it has developed a good amount of new foliage.
Types of Oregon Grape Holly
Compact Oregon Grape
‘Compacta’ is a cultivar of Oregon grape holly that grows slower and is smaller than the species. It reaches only 2 to 3 feet in height and 3 to 4 feet in width.
Creeping Oregon Grape
Mahonia repens is an evergreen groundcover with leathery, spiny green leaves. It grows 1 to 2 feet tall and spreads 3 to 4 feet. Creeping Oregon grape works well for erosion control on slopes.
'Orange Flame'
The new leaves of this cultivar start out as copper-orange and turn dark green and glossy as they mature later in the season. The shrub grows 2 to 4 feet tall and 3 to 5 feet wide.
Oregon Grape Holly Companion Plants
Wood Fern
Ferns can be finicky to grow but wood fern is an exception. It is a tough, adaptable, medium-sized fern with a bold texture. It is strong, easy to grow, and requires little maintenance. For a native plant garden, select a North American wood fern such as the very hardy male wood fern (Dryopteris filix-mas). It forms a 3-by-3-foot clump of fronds and remains evergreen in warm climates. Zone 3-8
Virginia Sweetspire
Virginia sweetspire (Itea virginica) is an excellent choice for a transition between woodland and sunny gardens because it grows well in either sun or shade. It grows 2 to 6 feet tall and 4 to 6 feet tall and has fragrant spring flowers. Its blazing fall foliage often persists well into winter. Zone 5-9
Fothergilla
A North American native, fothergilla deserves a place in every shade garden for its profuse honey-sweet brushy blooms and open, airy habit. The leathery leaves feature light undersides and turn to fiery shades of red, orange, and bright yellow in autumn. The smaller variety of this shrub, Fothergilla gardenia, grows only 3 to 5 feet tall. Zone 4-8
Frequently Asked Questions
- What is the difference between Mahonia aquifolium and Berberis aquifolium?These are two different names for the same plant. Based on the form of their leaves, taxonomists separated plants into two different genera, Mahonia with single leaves and Berberis with compound leaves, but the names are often used interchangeably.
These are two different names for the same plant. Based on the form of their leaves, taxonomists separated plants into two different genera, Mahonia with single leaves and Berberis with compound leaves, but the names are often used interchangeably.
- Are all grape hollies native to North America?No, there are other grape holly species native to Asia, including leatherleaf mahonia (Berberis bealei, syn. Mahonia bealei), which is confusingly also referred to as Oregon grape, and Chinese holly grape (Berberis lomariifolia, syn. Mahonia lomariifolia). Both are considered invasive in parts of the United States.
No, there are other grape holly species native to Asia, including leatherleaf mahonia (Berberis bealei, syn. Mahonia bealei), which is confusingly also referred to as Oregon grape, and Chinese holly grape (Berberis lomariifolia, syn. Mahonia lomariifolia). Both are considered invasive in parts of the United States.