Origin
Asteriscus schultzii (Bolle) Pit. & Proust, also known as Schultz's asteriscus, is a plant species belonging to the Asteraceae family. This species is endemic to the Canary Islands, specifically to the islands of La Palma, Tenerife, El Hierro and La Gomera.
Common Names
In addition to Schultz's asteriscus, the plant is also known by other common names such as yellow-eyed asteriscus and margarita de la cumbre (peak daisy).
Uses
Asteriscus schultzii is primarily used as an ornamental plant due to its striking yellow flowers and green, finely dissected leaves. It is often cultivated in gardens and used in landscaping projects, particularly in regions with a Mediterranean climate. Additionally, the plant has been traditionally used in herbal medicine to treat stomach issues and inflammation.
General Appearance
Asteriscus schultzii is a perennial herbaceous plant that can reach up to 60cm in height. Its elongated leaves are green and finely dissected, giving the plant a delicate, feathery appearance. The flowers of this species are also yellow, with a central disc of dark brown or black color. Schultz's asteriscus blooms from December to May and is adapted to conditions of low moisture and high temperatures.
Light
Asteriscus schultzii grows typically in full sun conditions. Full sun refers to exposure to direct sunlight for at least six hours every day. Plants grown in full sun usually produce more flowers, while those grown in the shade tend to be leggy with fewer flowers.
Temperature
The optimum temperature range for Asteriscus schultzii is between 20°C to 30°C, making it well-suited to warm climates. The plant can tolerate some heat and drought but will suffer from frost and cold temperatures. It is recommended to grow the plant in well-draining soil to prevent problems with root rot.
Soil requirements
Asteriscus schultzii prefers well-draining, sandy soil enriched with organic matter such as compost or well-rotted manure. The plant can tolerate poor soil conditions as long as it is well-drained. The soil pH should be neutral to slightly acidic, with a range of 6.0 to 7.0. It is suggested to avoid planting in heavy soils or those that tend to retain moisture for a long time as the plant is susceptible to root rot.
Cultivation
Asteriscus schultzii is a perennial plant that prefers well-drained soil and full sunlight. It can tolerate a wide range of soil types, including dry soil. The ideal temperature for its growth is between 20-25°C. It is vital to choose a planting location with good drainage because this plant does not thrive in wet soil. Plant in early spring or late autumn.
Watering Needs
Asteriscus schultzii requires infrequent watering. Since it can withstand dry soil, it is best to water deeply once every 10-14 days. It’s important not to overwater as it can lead to root rot and kill the plant. During the long dry spells, you can give it some water to keep the soil moist, but not wet.
Fertilization
It’s important to fertilize the plant for vibrant and healthy blooms. Fertilize with a slow-release type of fertilizer once every two months. You can also apply liquid fertilizer every two weeks, but this helps the plant mostly when blooming. Add a layer of compost to provide the soil with nutrients necessary for the plant’s survival.
Pruning
Pruning not only enhances the plant’s appearance but, it also encourages continuous blooming throughout the growing season. Cut back long, spindly stems and pinch off any dead flowers. Regular pruning of the plant can help encourage fullness and bushy habit. Prune in the late winter/early spring to promote new growth and blooming.
Propagation of Asteriscus schultzii
Asteriscus schultzii can be propagated either by seed or by vegetative means.
Propagation by Seed
The seeds of Asteriscus schultzii are relatively easy to collect and propagate. The best time to collect the seeds is when the seed heads have turned brown and the individual seeds are dark. Once collected, clean the seeds of any debris and store in a cool, dry place until ready to sow.
To sow the seeds, fill a small pot with well-draining soil and sprinkle the seeds over the surface. Lightly press them into the soil so they make good contact. Water the pot and cover with a plastic bag to create a humid, warm environment. The seeds should germinate in 7-10 days.
Propagation by Vegetative Means
Asteriscus schultzii can also be propagated through vegetative means, such as stem cuttings or division.
To propagate through stem cuttings, take a cutting from a healthy plant during the growing season. Make the cut just below a node and remove any lower leaves. Dip the cut end in rooting hormone and plant it in a well-draining soil mix. Keep the soil moist and the cutting humid until roots begin to develop.
Propagation through division is best done in the early spring. Simply dig up a clump of the plant and split it into smaller pieces. Replant the divided pieces in well-draining soil mix and keep them moist until they become established.
Disease and Pest Management for Asteriscus schultzii
Asteriscus schultzii, commonly known as the sunray daisy, is vulnerable to a few diseases and pests. Proper disease and pest management is essential to keep the plant healthy and flourishing. Here are some common diseases and pests that may affect the Asteriscus schultzii plant and ways to manage them.
Common Diseases of Asteriscus schultzii and their Management
1. Botrytis Blight: Botrytis blight is a fungal disease that causes the leaves to turn brown and form spots on the petals. It affects the plant during the wet and humid season. Management of Botrytis blight includes the use of fungicides and foliage removal. Application of fungicides like Mancozeb, Copper Hydroxide, and Chlorothalonil can help to control the disease. Removal of the infected plant parts and proper air circulation around the plant also aid in managing the disease.
2. Powdery Mildew: Powdery mildew is a fungal disease that affects the Asteriscus schultzii foliage and causes the leaves to turn white and powdery. The disease thrives in humid conditions. Management of powdery mildew includes the removal of infected plant parts, use of fungicides, and proper air circulation around the plant. Application of fungicides like Myclobutanil and Triforine can help manage the disease.
Common Pests of Asteriscus schultzii and their Management
1. Aphids: Aphids such as the green peach aphids and the potato aphids are known to feed on the sap of the Asteriscus schulzii. The pests typically feed on the new growth of the plant leading to distortion and stunted growth. Management of aphids includes the use of insecticidal soap or neem oil. Applying a solution of water and soap or neem oil on the plant helps to kill and control the infestation of the pests on the plant.
2. Spider Mites: Spider mites suck the plant sap, reducing the foliage quality and causing discoloration in the leaves. They thrive in hot and dry conditions. Management of spider mites includes the use of insecticidal soap, neem oil, or a mixture of alcohol and water. Wetting the foliage regularly, removing the infected plant parts, and maintaining proper humidity levels may also help in managing the infestation.
In conclusion, proper disease and pest management is crucial in maintaining the health and growth of Asteriscus schultzii. Following good cultural practices like maintaining proper sanitation, healthy plant growth, and quick detection and management of pests and diseases are key to keeping the plant flourishing.
