Overview
Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber is a popular perennial plant that belongs to the genus Oreoxis and is commonly found in the Rocky Mountains of North America.
Common Names
The plant has been given various common names including smooth mountain aster and pubescent mountain aster.
Appearance
Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber is a woody-based perennial that can grow up to a height of 20-30 cm. It has erect, somewhat hairy stems that are often branched. The leaves of the plant are alternate and hairy with the shape ranging from oblong to linear-lanceolate.
The flowering period for the plant ranges from the months of July to September and the flowers are arranged in corymbs. The flowerheads measure around 1 cm in diameter and comprise of numerous yellow petals.
Uses
The plant has several medicinal uses. It was historically used by Native American tribes to treat skin sores, and also as a wash to treat burns and other skin irritations.
Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber is grown as an ornamental plant in gardens and is used as a ground cover in landscaping.
Light Requirements
Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber grows optimally in a sunny location where it can receive full sunlight for at least 6 hours per day. The plant can tolerate partial shade but cannot grow in deep shade. Insufficient light can cause stunted growth and reduce the plant's overall health.
Temperature Requirements
Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber grows best in cool climates where temperatures range between 45°F to 75°F (7°C to 24°C). The plant is hardy and can tolerate occasional frost, but it cannot withstand extended periods of high temperatures or extreme heat. Summer heat can cause the plant to wilt, leading to slowed growth or plant death.
Soil Requirements
Good soil drainage is crucial for Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber, and it prefers a well-draining soil that stays moist but not waterlogged. The plant grows best in nutrient-rich, acidic soils with a pH range of 4.5 to 5.5. It may tolerate slightly alkaline soils but not heavy clayey or sandy soils. The plant benefits from regular organic matter addition to improve soil structure and fertility.
Cultivation
Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber is a mountain plant that can tolerate harsh conditions; therefore, it can be grown in containers and garden grounds. When planting, ensure to use well-draining soil and adequate spacing. This plant thrives in a sunny and well-drained site and can grow up to 15-20 cm in height.
Watering Needs
The plant can be watered once a week or whenever the soil becomes dry. However, during hotter months, the plant may require frequent watering to avoid drying out. Overwatering may lead to waterlogging, which can cause root rot. Therefore, only water when necessary, and do not leave water sitting in the plant's saucer.
Fertilization
Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber can be fertilized once a year using an all-purpose fertilizer. Fertilization helps to promote healthy growth and development of the foliage and blooms. Fertilizers that are high in nitrogen can be utilized, but the use of organic fertilizers is recommended. Organic fertilizers provide essential nutrients gradually, and they do not harm the soil. Overfertilization may lead to stunted growth or cause yellowing leaves, so use the recommended dosage of fertilizer.
Pruning
Pruning of the plant is not necessary as it has a natural growth habit. However, if you wish to shape the plant or control its growth, it can be pruned lightly. Deadheading (removing faded flowers) also ensures continuous blooming. Use clean and sharp shears to avoid infecting the plant with disease and only prune when necessary.
Propagation of Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber
Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber can be propagated through various methods, including seed propagation and vegetative propagation.
Seed propagation
The plant typically produces seeds that can be harvested when they are fully matured and dried. The seeds can then be sown in well-draining soil in a suitable location. The best time to plant the seeds is in fall or early spring. The seeds require a cold period for optimal germination, so it is recommended to sow them outdoors in late fall, allowing them to experience winter conditions before sprouting in the spring.
Vegetative propagation
Vegetative propagation of Oreoxis alpina (Gray) Coult. & Rose ssp. puberulenta W.A. Weber can be done through stem cuttings. Softwood cuttings can be taken in the summer, while hardwood cuttings can be taken in the fall.
To propagate through stem cuttings, select a healthy stem and cut it to a length of around 4-6 inches. Ensure that the cutting has at least two leaves. Remove the lower leaves and insert the stem into a well-draining rooting medium. Ensure that the cutting is watered regularly and kept in a humid environment until it has developed roots. This process usually takes several weeks.
It is recommended to cover the cutting with a plastic bag or container to maintain humidity and retain moisture as the roots develop. Once the cutting has developed roots, it can be transplanted into a suitable location.
Disease and Pest Management for Oreoxis alpina ssp. puberulenta
Oreoxis alpina ssp. puberulenta is a resilient and robust plant, but despite its hardiness, it is susceptible to certain diseases and pests. Here are some of the most common ones and ways to manage them:
Diseases:
1. Leaf Spot: This is a fungal disease that causes small, circular spots on the foliage. It affects the plant's photosynthesis, so it is essential to deal with it before the plant gets damaged. Cut off the affected leaves and dispose of them in the trash. Do not compost, as this may spread the disease further. Furthermore, practice a good watering regime by keeping the leaves and soil dry.
2. Powdery Mildew: Powdery mildew is another fungal disease that appears as a white, powdery coating on the leaves and flowers. It also affects the plant's ability to photosynthesize. Removing the infected foliage is crucial in managing this disease. Also, spraying the plant with a mixture of one tablespoon of baking soda and one gallon of water every week can prevent this disease from spreading.
Pests:
1. Aphids: These small insects suck the sap from the plant, leaving behind a sticky residue and causing the plant's leaves to curl and wither. To manage aphids, you can blast them off with a jet of water or apply insecticidal soap or horticultural oil. These oils and soaps suffocate the insects, preventing further attacks.
2. Spider Mites: Spider mites are tiny arachnids that feed on the plant's sap, causing its leaves to yellow and drop. To manage spider mites, regular spraying with water is beneficial. Also, insecticidal soap or neem oil can be applied to control an infestation. Introduce natural predators such as ladybugs, lacewings, and beneficial nematodes to help manage spider mites.
Oreoxis alpina ssp. puberulenta is a beautiful and resilient plant that deserves proper care to thrive. With good management practices, you can keep diseases and pests at bay, ensuring that this p[lant blossoms to full potential.
