Overview of Sorbus groenlandica
Sorbus groenlandica (Schneid.) A.& D. Löve, commonly known as Greenland mountain-ash or ishnuk in the Inuit language, is a shrub that belongs to the family Rosaceae. It is native to Greenland, northern Canada, and Alaska, where it grows in the tundra and rocky soils of the Arctic and subarctic regions.
Description of Sorbus groenlandica
Greenland mountain-ash is a deciduous shrub that grows up to 1.5 meters tall. It has a rounded and compact shape, with multiple stems growing from the base. The leaves are pinnately compound, with 9 to 15 leaflets that are elliptical or lance-shaped and finely serrated. The flowers are small and white, forming flat-topped clusters that bloom from May to June. The fruit is a bright red or orange spherical pome, about the size of a pea, that ripens in late summer or early fall.
Uses of Sorbus groenlandica
The fruit of Greenland mountain-ash is edible and has a sweet-tart flavor. In traditional Inuit culture, it was used fresh or dried to make jams, jellies, and pemmican, a high-energy food made of dried meat and berries. The bark and roots were used for medicinal purposes, such as treating diarrhea, fever, and coughs. In modern times, the shrub is appreciated for its ornamental value and is used in landscaping projects to provide winter interest and attract wildlife.
Greenland mountain-ash is a hardy plant that can grow in cold and harsh environments, making it an ideal choice for gardens and parks in northern latitudes. It can tolerate a wide range of soils and can grow in full sun or partial shade. In addition, it is resistant to many pests and diseases, making it a low-maintenance option.
Light Requirements
Sorbus groenlandica grows best in full sun exposure, but it can also tolerate partial shade. In areas with harsh sun, it is recommended to provide some shade during the hottest parts of the day.
Temperature Requirements
This plant species is well-suited to grow in areas with cool to moderate climates. It thrives in temperatures between 50°F to 70°F (10°C to 21°C).
Soil Requirements
Sorbus groenlandica prefers well-draining and moist soil but can also tolerate a wide range of soil types, including clay or sandy soils. It grows best in slightly acidic soil with a pH between 5.5 to 6.5. It is also necessary to ensure that the soil is rich in organic matter to support the plant's growth.
Cultivation
Sorbus groenlandica (Schneid.) A.& D. Löve, commonly known as Greenland mountain ash or Grey Mountain-ash, is a deciduous shrub or small tree that is native to cold regions of the northern hemisphere, including Greenland and parts of Canada.
It prefers to grow in well-draining soils that are rich in organic matter and slightly acidic. It can tolerate partial shade but will grow best in full sun. The plant can be propagated by seed or by semi-hardwood cuttings taken in late summer.
Watering
Sorbus groenlandica should be watered regularly, especially during its first growing season. The soil should be kept moist but not waterlogged. During dry periods, it will benefit from deep, infrequent watering.
However, excessive watering can lead to root rot, so it is important to ensure that the soil is well-draining.
Fertilization
Fertilization is not always necessary for Sorbus groenlandica, but it can benefit from an annual application of a balanced fertilizer in early spring or after the first flush of growth.
Avoid over-fertilization, as this can lead to excessive foliage growth at the expense of flower and fruit production.
Pruning
Pruning should be done in late winter or early spring, while the plant is still dormant. Remove any dead or diseased wood, as well as any crossing or rubbing branches.
To maintain a compact and well-shaped plant, remove any suckers from the base of the plant. If necessary, light shaping can be done after the plant has finished blooming in early summer.
Propagation of Sorbus Groenlandica
Sorbus groenlandica, also known as the Greenland Rowan or Caucasian mountain ash, is a low-maintenance shrub that is commonly found in gardens and landscapes. There are different methods of propagating this plant, including seed propagation, stem cuttings, and grafting.
Seed Propagation
Propagation of Sorbus groenlandica from seeds is the most common method. The plant's seeds can be collected in the fall and planted immediately in spring, or they can be stored dry until spring. When planting, ensure a soil depth of at least 6 to 8 inches and that the soil is fertile and well-draining. Germination is typically slow, taking 6 to 12 weeks. Once the seedlings have developed two to three leaves, they can be transplanted into larger pots or the ground.
Stem Cuttings
Propagation of Sorbus groenlandica from stem cuttings is also possible. Take cuttings in late spring or early summer when the plant is actively growing. Cut a 6-8 inch section of a healthy stem, dip the cut end into rooting hormone, and plant it in well-draining soil. Keep the soil moist and place the cutting in a bright but shaded location. Roots should develop within 3 to 4 weeks. When the plant has developed a strong root system, it can be transplanted to its permanent location.
Grafting
Grafting is another method of propagating Sorbus groenlandica, especially if a specific cultivar or variety is desired. It involves taking a scion (a stem piece) from a desired cultivar and attaching it to a rootstock. Grafting is usually done in the spring when growth is starting. The scion and rootstock must be of similar size for successful grafting. After grafting, maintain the humidity around the plant and protect it from strong winds until the graft has taken.
Overall, Sorbus groenlandica is a relatively easy plant to propagate, and each method has its advantages. Seed propagation is the easiest and most convenient method, while stem cuttings and grafting are ideal for reproducing specific cultivars or creating new hybrids. Regardless of the propagation method used, ensure proper care and maintenance to encourage growth and healthy development of the plant.
Disease Management
Sorbus groenlandica is generally a healthy plant, but it can be susceptible to some diseases. Common diseases that might affect Sorbus groenlandica include Powdery Mildew, Fire Blight, and Cedar Quince Rust.
Powdery Mildew appears as a white powdery coating on the leaves. To manage this disease, remove any infected parts of the plant and try to increase air circulation around the plant by pruning back surrounding foliage. Applying a fungicide may also be effective.
Fire Blight appears as blackened and withered stems, flowers, and fruit. To manage this disease, prune back infected branches to at least six inches below the diseased area and clean any pruning tools between cuts with a solution of 70% isopropyl alcohol.
Cedar Quince Rust appears as yellow or orange spots on the leaves. To manage this disease, remove any infected parts of the plant and avoid planting Sorbus groenlandica near cedar trees. Applying a fungicide may also be effective.
Pest Management
Sorbus groenlandica is not usually heavily infested by pests. However, there are some pests that might affect this plant. Common pests that might affect Sorbus groenlandica include Aphids, Spider Mites, and Borers.
Aphids appear as small insects that cluster on the undersides of leaves and suck the plant’s sap. To manage this pest, wash the plant with a strong stream of water or spray with insecticidal soap or oil.
Spider Mites appear as tiny red or brown dots on the leaves and can cause significant damage to the plant. To manage this pest, wash the plant with a strong stream of water or spray with insecticidal soap or oil.
Borers lay their eggs in the bark of the plant, and their larvae will tunnel inside, causing significant damage. To manage this pest, regularly prune and dispose of dead and diseased wood, inspect plants regularly for signs of borers, and use insecticides if necessary.
