Origin
Oreostemma alpigenum (Torr. & Gray) Greene var. andersonii (Gray) Nesom, commonly known as the Anderson's Alpine Daisy, is a native to North America. Its range extends from Alaska down to Northern California and across to the Rocky Mountains and central Canada.
Common names
The Anderson's Alpine Daisy has several common names depending on the region where it is found. In Alaska, it is called "Anderson's Fleabane," while in Montana, it is referred to as "Mountain Star Daisy."
Uses
The Anderson's Alpine Daisy is primarily grown as an ornamental plant in rock gardens, along borders, and for landscaping. It provides a beautiful display of daisy-like flowers with white petals surrounding a yellow center. Some Native American tribes also used this plant for medicinal purposes, including treating respiratory illnesses, skin ailments, and digestive issues.
General Appearance
Oreostemma alpigenum var. andersonii is a small, perennial plant that belongs to the Asteraceae family. The plant can grow up to 40 cm in height and has dark green, lance-shaped leaves that form a rosette at the base. The flowers appear on the stems from June through August and typically measure 2-3 cm in diameter. They have white petals and yellow centers that turn to reddish-purple as they mature. The plant thrives in dry, rocky soils in alpine meadows, subalpine slopes, and other high-altitude habitats.
Light Requirements
Oreostemma alpigenum var. andersonii requires full sun to partial shade for optimal growth. In areas with high temperatures, this species may need some shade to prevent the leaves from drying out.
Temperature Requirements
This plant is native to alpine and subalpine regions, so it requires cool temperatures to thrive. The ideal temperature range for growth is between 40-60°F (4-15°C). However, it can tolerate temperatures as low as 20°F (-7°C) and as high as 75°F (24°C) for short periods.
Soil Requirements
Oreostemma alpigenum var. andersonii prefers well-drained, acidic soils with pH ranging from 4.5 to 6.0. It can grow in various soil types such as sandy, loamy, or rocky soils, but it performs best in sandy or gravelly soils. This species can tolerate soil nutrient deficiencies, but it needs some organic matter for optimal growth.
Cultivation methods
Oreostemma alpigenum var. andersonii is native to alpine or subalpine areas in the western United States. It thrives in well-drained soils with a pH range of 6.0 to 7.5. The plant prefers full sun but can tolerate light shade. If you plan to cultivate Oreostemma alpigenum var. andersonii, make sure to provide it with enough space to spread. The plant can grow up to 18 inches tall and 24 inches wide.Watering needs
The plant is drought-tolerant and does not need frequent watering. It can survive with natural rainfall, but if the area experiences extended drought periods, the plant may benefit from occasional watering. When watering, make sure not to overwater as the plant may suffer from root rot. The soil should be allowed to dry out slightly before watering again.Fertilization
Oreostemma alpigenum var. andersonii does not require frequent fertilization. However, applying a slow-release fertilizer during the growing season can help improve its overall performance. It is essential to use a balanced fertilizer with equal portions of nitrogen, phosphorus, and potassium. Make sure not to overfertilize as this can cause excessive growth, leading to weaker stems and decreased plant longevity.Pruning
Oreostemma alpigenum var. andersonii does not require frequent pruning. However, removing dead or damaged stems can help keep the plant in good shape. To promote bushier growth, you can pinch back the stems in the early growing season. This encourages branching and can increase the number of flowers. You should avoid pruning the plant after the flowering season as this can reduce the number of blooms the following year.Propagation of Oreostemma alpigenum var. andersonii
Oreostemma alpigenum var. andersonii is a perennial plant native to high-elevation rocky areas in California and Nevada. Propagation of this plant can be achieved through several methods, including:
Seed Propagation
One of the easiest methods of propagation is through seeds. The seeds of Oreostemma alpigenum var. andersonii should be collected in late summer or early fall when they are fully mature. They can be sown immediately, or the seeds can be stored in a cool, dry place until the following spring. To improve the germination rate, the seeds should be stratified by moistening them and storing them in a sealed container in the refrigerator for three to four weeks before sowing. Seedlings should emerge within two to three weeks and can be transplanted in the spring after the danger of frost has passed.
Division
Oreostemma alpigenum var. andersonii can also be propagated by division. This method is best done in early spring when new growth is just emerging. Simply dig up the plant and gently separate the root mass into smaller sections, making sure that each section has a portion of the root system and some new shoots. Replant the divisions immediately, making sure to keep them well-watered until they become established.
Cuttings
While Oreostemma alpigenum var. andersonii can be propagated by cuttings, it can be a bit more challenging. Cuttings should be taken in late spring or early summer when new growth is just starting to harden off. Take cuttings that are 3-4 inches long, and strip the lower leaves from the stem. Dip the cut end of the stem in rooting hormone and plant in a well-draining potting mix. Place the pot in a warm, bright location and keep the soil moist but not wet. It may take several weeks for the cuttings to root, but once they do, they can be transplanted into individual pots until they are large enough to plant in the garden.
Disease and Pest Management for Oreostemma alpigenum var. andersonii
Oreostemma alpigenum var. andersonii, commonly referred to as Anderson's mountain daisy, is a beautiful perennial plant native to the alpine regions of California and Nevada. While it is a relatively vigorous plant, it is not immune to a few pests and diseases. Below are some guidelines on how to identify and control these diseases and pests should they strike your Oreostemma alpigenum var. andersonii.
Common Diseases
Powdery Mildew: Powdery mildew is a fungal disease that affects a wide variety of plants, including Oreostemma alpigenum var. andersonii. Symptoms of powdery mildew include white, powdery spots that appear on the leaves, stems, and flowers of the plant. It is usually caused by high humidity levels. To control powdery mildew, spray affected plants with a fungicidal soap or a baking soda solution (1 tablespoon of baking soda in 1 quart of water) every week until the symptoms disappear.
Crown Rot: Crown rot is a disease that affects the plant's roots and crowns, causing them to decay and turn brown. This disease is usually caused by overwatering the plant or planting it in soil that does not drain properly. To control crown rot, reduce the amount of water you are giving your Oreostemma alpigenum var. andersonii and make sure it is planted in well-drained soil.
Common Pests
Aphids: Aphids are common pests that attack a wide variety of plants, including Oreostemma alpigenum var. andersonii. They are tiny, green insects that suck sap from the plant's leaves, causing them to wilt and turn yellow. To control aphids, blast them off the plant with a strong stream of water or spray the plant with an insecticidal soap.
Spider Mites: Spider mites are tiny pests that thrive in hot, dry conditions. They can quickly infest a plant, sucking the sap from the leaves and leaving behind a web-like substance. To control spider mites, spray the plant with a miticide every week until the pests are gone.
Caterpillars: Some caterpillars, such as the painted lady caterpillar, can cause significant damage to Oreostemma alpigenum var. andersonii, eating their way through the plant's leaves. To control caterpillars, pick them off by hand or spray the plant with an insecticide that is designed to control caterpillars.
By taking these steps to identify and control diseases and pests, you can ensure that your Oreostemma alpigenum var. andersonii stays healthy and beautiful all year long.
