Overview
Dichrocephala chrysanthemifolia (Blume) DC. var. tanacetoides (Sch.Bip.) J.Kost. is a perennial herb that belongs to the family Asteraceae. It is also commonly known as the yellow top, false tansy, and golden algerita.
Origin
Dichrocephala chrysanthemifolia var. tanacetoides is native to Mexico and can also be found growing in other parts of Central America, South America, and the Caribbean. It has also been introduced to other regions around the world, including the southeastern United States, where it is considered an invasive species.
General Appearance
The yellow top plant has a unique appearance, with long stems that can grow up to 60 cm tall. Its leaves are alternate, linear, and deeply lobed, resembling those of a fern. The flowers of the plant are small and yellow, with a bright yellow disc surrounded by several golden-yellow ray florets. The flowers are produced in clusters at the ends of the stems and branches.
Uses
In traditional medicine, parts of the yellow top plant have been used for their analgesic and anti-inflammatory properties. It has also been used to treat gastrointestinal disorders, skin infections, and respiratory conditions.
In horticulture, this plant is commonly grown as an ornamental plant for its attractive foliage and bright yellow flowers. However, it should be noted that it can be invasive in some regions and may outcompete native vegetation.
Light Requirements
Dichrocephala chrysanthemifolia (Blume) DC. var. tanacetoides (Sch.Bip.) J.Kost. prefers bright sunlight for optimum growth. It requires at least 6 hours of direct sunlight per day. The plant may survive in moderate shade, but it may not produce flowers.
Temperature Requirements
This plant requires a warm temperature for proper growth. The optimum temperature range for Dichrocephala chrysanthemifolia (Blume) DC. var. tanacetoides (Sch.Bip.) J.Kost. is between 20°C to 28°C. It can survive in temperatures ranging from 15°C to 34°C. However, it may not survive frosty conditions.
Soil Requirements
The plant prefers well-drained soil with a pH range of 6.0 to 7.5. It grows best in sandy loam soil that is rich in organic matter. The soil should be moist but not waterlogged. Adequate drainage is essential to avoid waterlogging, which may cause root rot, and stunted growth.
Cultivation Methods
Dichrocephala chrysanthemifolia var. tanacetoides is a sun-loving plant that requires well-drained soil to grow. It can be grown both indoors and outdoors, but it thrives best in well-lit areas with free-flowing air. The plant adapts well to different soil types, but it thrives best in loamy, sandy soils. It is recommended that the plant be grown in areas that are protected from strong winds and frost.
Watering Needs
The plant is drought-tolerant; therefore, it requires minimal watering. However, it is essential to maintain adequate moisture levels for optimum growth. It is recommended that the plant be watered only when the soil has dried out up to a depth of one inch. Overwatering can cause root rot and other fungal diseases.
Fertilization
Dichrocephala chrysanthemifolia var. tanacetoides requires regular fertilization to thrive. The plant thrives well in soil that is rich in organic matter. It is recommended that the plant be fertilized with a water-soluble fertilizer once every two weeks during the growing season. Over-fertilization can cause the plant to develop weak stems and foliage.
Pruning
Dichrocephala chrysanthemifolia var. tanacetoides requires regular pruning to maintain its shape and size. It is recommended that the plant be pruned in early spring or late winter before the new growing season. Pruning encourages the plant to produce bushier growth and more flowers. When pruning, it is best to remove dead, diseased, or damaged stems and foliage. To promote more abundant flowering, it is recommended that spent flowers or blooms be removed regularly.
Propagation of Dichrocephala chrysanthemifolia (Blume) DC. var. tanacetoides (Sch.Bip.) J.Kost.
Dichrocephala chrysanthemifolia (Blume) DC. var. tanacetoides (Sch.Bip.) J.Kost. can be propagated by various methods, including:
Seed Propagation
Seeds of Dichrocephala chrysanthemifolia (Blume) DC. var. tanacetoides (Sch.Bip.) J.Kost. can be sown directly in the garden or pots during spring or early summer. The seeds should be sown 1/8 inch deep and kept moist until germination, which usually takes about 2 weeks. The seedlings should be transplanted outdoors or repotted in larger containers after they have developed several true leaves.
Cuttings Propagation
Softwood cuttings of Dichrocephala chrysanthemifolia (Blume) DC. var. tanacetoides (Sch.Bip.) J.Kost. can be taken during late spring or early summer when the new growth is still tender. The cuttings should be 4-6 inches long and have at least 2-3 nodes. Dip the cuttings in rooting hormone and insert them in a well-draining potting mix. The cuttings should be watered regularly and kept in a shaded area until roots develop, usually within 4-6 weeks. The rooted cuttings should be transplanted outdoors or repotted in larger containers.
Division Propagation
Dichrocephala chrysanthemifolia (Blume) DC. var. tanacetoides (Sch.Bip.) J.Kost. can be propagated by dividing the mature clumps during early spring or fall. Carefully dig up the clump and separate the individual shoots. Each shoot should have its own set of leaves and roots. Replant the divided clumps in a well-draining soil mix.
Disease and Pest Management for Dichrocephala chrysanthemifolia var. tanacetoides
Dichrocephala chrysanthemifolia var. tanacetoides is a relatively pest-resistant plant. However, just like any other plant, it is still susceptible to some diseases and pests. In this article, we will discuss the most common diseases and pests that affect Dichrocephala chrysanthemifolia var. tanacetoides and how to manage them.
Common Diseases
The following are the most common diseases that affect Dichrocephala chrysanthemifolia var. tanacetoides:
Powdery Mildew
Powdery mildew is a fungal disease that appears as a white powdery substance on the leaves and stems of the plant. It can be managed by removing the affected leaves and providing better air circulation.
Leaf Spot
Leaf spot is another fungal disease that causes circular spots on the leaves of the plant. To manage leaf spot, remove the affected leaves and avoid watering the plant from above.
Common Pests
The following are the most common pests that affect Dichrocephala chrysanthemifolia var. tanacetoides:
Aphids
Aphids are small, soft-bodied insects that suck the sap from the plant's stems and leaves. A strong spray of water can remove aphids from the plant. Alternatively, you can introduce ladybugs, lacewings or parasitic wasps which are natural predators of aphids.
Spider Mites
Spider mites are tiny pests that can cause damage to the plant by sucking the sap from the leaves. They are often difficult to see with the naked eye, but their webs can be visible. Spider mites can be managed by spraying the plant with neem oil or insecticidal soap.
Caterpillars
Caterpillars are the larval stage of butterflies or moths. They can cause significant damage to the plant by chewing on leaves and stems. To manage caterpillars, remove them by hand or introduce predators such as birds or beneficial insects like parasitic wasps and lacewings.
By following these pest and disease management practices, you can keep Dichrocephala chrysanthemifolia var. tanacetoides healthy and free from common diseases and pests.
