Overview
Coleus subulatus Robyns is a perennial herbaceous plant that belongs to the family Lamiaceae. This plant is usually found growing in tropical Africa, specifically in Cameroon, Congo, and Gabon.
Common names
In Cameroon, Coleus subulatus is commonly known as "ngombe" in Basaa and "okiok" in Bamileke.
General appearance
This plant has a unique appearance. It has a pair of opposite leaves that are oblong-lanceolate or sub-sessile. The leaves usually measure about 1.5 cm in length and are dark green in color. The stem of Coleus subulatus is squarish and has an average length of 5 cm. It is typically covered with glandular and puberulent hairs.
The plant produces small flowers that are pale violet in color and arranged in axillary clusters. These flowers usually grow in pairs of two or three.
Uses
Coleus subulatus is used in traditional African medicine for various purposes. The plant is known to have anti-inflammatory, analgesic, and anti-diabetic properties. It is also used to treat respiratory diseases, such as asthma. In Cameroon, the roots of the plant are boiled and the resulting decoction is used to treat rheumatism.
In addition to its medicinal properties, Coleus subulatus is also used for ornamental purposes. The plant is quite attractive and can be grown as an indoor plant.
Light Conditions
Coleus subulatus Robyns prefer bright indirect sunlight to grow. Direct sunlight can scorch the leaves, but lack of light can cause the plant to become leggy and thin. Therefore, it is important to place the plant in an area where it can receive enough light without the risk of being sunburnt.
Temperature Requirements
Coleus subulatus Robyns grows best in warm environments with temperatures between 60°F and 75°F (15°C and 24°C). Temperatures below 50°F (10°C) can cause damage to the plant, while temperatures above 90°F (32°C) can cause the leaves to wilt. Therefore, it is important to keep the plant in a room with consistent temperatures and avoid placing it near air conditioning or heating vents.
Soil Requirements
Coleus subulatus Robyns prefer well-draining and nutrient-rich soil. A recommended soil mix is a combination of peat moss, perlite, and vermiculite. The pH of the soil should be slightly acidic, around 5.6 to 6.2. It is important to ensure that the soil is not too wet or too dry, as the plant can be sensitive to extremes. It is recommended to water the plant when the top inch of soil feels dry to the touch.
Cultivation Methods for Coleus subulatus Robyns
Coleus subulatus Robyns is an easy-to-grow plant that thrives in warm and humid conditions. It is best grown in well-draining soil with a pH range of 6.0 to 7.5. This plant can be propagated from seeds or stem cuttings. If planting from seeds, sow them in the early spring, and keep the soil moist until the seedlings emerge.
The stem cuttings can be taken at any time during the growing season. Simply take a 3-4 inch long cutting from a healthy plant, remove the lower leaves, and stick it into moist potting soil. Place the pot in a bright, but indirect light and keep the soil damp. The cuttings will root in a few weeks and can be transplanted into a larger pot or into the garden.
Watering Needs for Coleus subulatus Robyns
Coleus subulatus Robyns prefers to be kept consistently moist, but not waterlogged. Water the plant deeply whenever the topsoil feels dry to the touch. If the leaves start to wilt, it's a sign that the plant is not getting enough water. Water the plant until the soil is moist throughout, and avoid getting water on the leaves, as this can lead to fungal diseases.
Fertilization for Coleus subulatus Robyns
Coleus subulatus Robyns benefits from regular fertilization during the growing season. Use a balanced, water-soluble fertilizer every two weeks, or use a slow-release fertilizer at the beginning of the growing season. Be sure to dilute the fertilizer to half of the recommended strength to avoid over-fertilizing, which can damage the plant.
Pruning for Coleus subulatus Robyns
To keep Coleus subulatus Robyns looking full and bushy, pinch back the growing tips regularly. This will encourage the plant to put out side shoots and result in a broader, more attractive plant. Pruning can also be used to manage the height of the plant. If the plant becomes too tall and leggy, cut it back to just above a leaf node, and new growth will sprout from there.
Propagation of Coleus subulatus Robyns
Coleus subulatus Robyns, commonly known as the slender coleus, is an attractive plant with unique leaves that make it popular among gardeners. Propagation is an effective way of increasing the number of plants and maintaining their population in a particular area. Various methods can be used to propagate Coleus subulatus Robyns, as discussed below.
Propagation by Seeds
Propagation by seeds is a common method for coleus subulatus Robyns. To propagate through seeds, collect the seeds from ripe seed capsules that have turned brown. Afterward, allow the seeds to dry thoroughly before sowing them in a seedbed. The ideal germination temperature should be around 70°F. Ensure that the soil is consistently moist until the seedlings emerge. Additionally, a good-quality potting mix that is rich in organic matter should be used. Seedlings should be allowed to grow to at least 2 inches tall before transplanting.
Propagation by Cuttings
Propagation of Coleus subulatus Robyns by stem cuttings is also a popular method. Cuttings should be taken from a mature plant in the early morning or late evening when temperatures are reasonable. Remove the leaves on the lower part of the stem and dip the cut end into a rooting hormone. Afterward, plant the cutting into a pot or seedbed with well-draining soil. The plant should be kept consistently moist until roots start to sprout. Transplant the rooted plant to its permanent site when the roots are large enough, and new growth appears.
Propagation by Division
Propagation by division is another effective technique for propagating Coleus subulatus Robyns. When the plant has matured, dig up the soil around the plant's base, being careful not to damage the roots. Divide the root ball into two or more sections and then replant them in their new location. Be sure to water the newly transferred plant thoroughly to help it establish itself in its new environment.
Following these propagation techniques can help increase the number of Coleus subulatus Robyns plants. Each method has unique requirements and should be followed carefully to ensure successful propagation. By propagating Coleus subulatus Robyns, you can continue to enjoy this beautiful plant for years to come.
Disease and Pest Management for Coleus Subulatus Robyns Plants
Coleus subulatus Robyns is an attractive and low-maintenance plant that hails from Africa and Madagascar. Despite its resilience, it can still be affected by various pests and diseases that can impact its overall appearance and health. Here are some common diseases and pests that might affect Coleus subulatus Robyns and ways to manage them:
Common Diseases
One of the most frequent diseases affecting Coleus subulatus Robyns is root rot. It occurs because of overwatering or poor drainage. The roots start to decay, and the plant exhibits stunted growth, yellow leaves, and a droopy appearance. To avoid this, ensure that you do not overwater and that water drains correctly.
Fungal diseases like powdery mildew and gray mold can also affect Coleus subulatus Robyns. Powdery mildew creates a white, powdery residue on the foliage. Gray mold appears as gray, fuzzy patches on the leaves and stems. These diseases often appear when the plant is overcrowded or not receiving enough sunlight or airflow. To manage this, avoid overwatering them, and improve the airflow by pruning the affected parts of the plants or improve ventilation.
Common Pests
Coleus subulatus Robyns plants can also be affected by pests like spider mites, aphids, and whiteflies. Spider mites and aphids feed on the sap of the plant, causing discoloration and deformation of plant leaves. Meanwhile, whiteflies produce sticky honeydew that attracts ants and promotes the growth of sooty mold.
To manage spider mites and aphids, you can wash off the pests with a strong jet of water or spray the plant with neem oil or insecticidal soap. For whiteflies, sticky traps and introducing ladybugs, lacewings, and chrysoperla can help control their population.
Conclusion
Overall, Coleus subulatus Robyns is a hardy plant, but it still needs care and attention from its owner. By understanding the common diseases and pests that affect it, you can take steps to prevent and manage any issues that arise.
