Origin and Common Names
Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer, commonly known as the 'H?h?', is a species of flowering plant belonging to the family Campanulaceae. This plant is native to Hawaii and can be found on the island of Maui at elevations ranging from 1,300 to 2,500 meters above sea level.
General Appearance
The H?h? plant is a small tree that can grow up to 3-4 meters tall and has a trunk diameter of up to 8 centimeters. The leaves of the plant are dark green, large, and glossy with an oblong to oval shape measuring up to 40 centimeters long and 20 centimeters wide. The inflorescence is made up of dark blue flowers that resemble miniature lobelia blossoms. The flowers are slightly fragrant and have a sweet scent.
Uses
The H?h? plant has significant cultural importance to the indigenous people of Hawaii. It is often used in traditional Hawaiian medicine for the treatment of fever and coughs. The leaves of the H?h? plant are also used in lei making due to their large size and glossy dark green color. They are also used in the creation of hula skirts for performances and traditional cultural ceremonies.
The H?h? plant is also cultivated as an ornamental plant in gardens. Due to its exotic appearance, it is popular among collectors of tropical and subtropical plants. This plant requires moderate to high humidity and prefers well-draining soil. It is suitable for the USDA zones of 10b to 11.
Light
Cyanea sylvestris var. eriantha typically grows under the canopy of trees or on shaded slopes in its native habitat. It prefers bright light but not direct sunlight. Therefore, it is best to grow this plant indoors near a north-facing window or outdoors in a shaded area.
Temperature
The plant thrives in temperatures between 16°C to 24°C (60°F to 75°F). Protect the plant from extremely cold temperatures, especially below 7°C (45°F), which could lead to cold stress and damage.
Soil
The Cyanea sylvestris var. eriantha prefers well-draining soil that is rich in organic matter. The pH of the soil should be slightly acidic, around 5.5 to 6.5, similar to its natural habitat. A mix of peat moss, perlite and vermiculite can help in providing the required soil composition. Adding small amounts of loam can supplement it further.
Water and Humidity
These plants require regular watering to keep the soil moist, but not waterlogged. It is important to maintain a consistent level of humidity around the plant, as it is used to moist environments. To achieve this, placing a tray of water beneath the plant or spraying the leaves with water occasionally can help ensure a humid environment.
Cultivation Methods
Cyanea sylvestris Heller var. eriantha is a plant that thrives in a well-draining soil mix. It is best cultivated in areas with partial or full shade. The plant requires a high level of humidity, so it is essential to group it with other plants or place a tray of water nearby to maintain adequate humidity levels.
When cultivating Cyanea sylvestris Heller var. eriantha, it is best to use a rich humus compost and mix it with perlite or vermiculite to create an aerated soil mix. The plant prefers temperatures ranging from 60°F to 75°F, making it ideal to grow in tropical climates.
Watering Needs
Cyanea sylvestris Heller var. eriantha requires consistent watering, but one should avoid overwatering. The topsoil must dry out before the next watering. The best way to ensure proper watering is to use the finger method. Dip your finger into the soil to check the moisture levels before watering the plant.
It is essential to use filtered or rainwater since the plant is sensitive to hard water. Avoid allowing the plant to sit in water or watering the leaves which can cause root rot and death.
Fertilization
Cyanea sylvestris Heller var. eriantha requires constant feeding to support its growth and vibrant foliage. Begin by fertilizing the plant every two weeks during the growing season and monthly during the winter.
Use an organic fertilizer formulated for flowering plants and dilute it to half strength. During the winter, it is best to use a low-nitrogen fertilizer to encourage flowering. Overfertilizing can damage the plant, so always follow the recommended dosage on the label.
Pruning
Pruning is essential to keep Cyanea sylvestris Heller var. eriantha healthy and prevent overgrowth. Begin by removing dead or yellow foliage to make room for new growth.
The plant blooms on the terminal raceme, so it is essential to prune the spent flowers to encourage new blooming. Cutting off the terminal raceme can stimulate the growth of new flowers. Avoid trimming the leaves from the base since the plant derives its nutrients from them.
Prune the plant after the blooming season to remove any dead branches or overcrowded areas. Use sterilized pruning scissors to prevent the spread of diseases.
Propagation of Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer
Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer, commonly known as the Giant Hawaiian Blue Lobelia, is a stunning herbaceous plant that is endemic to Hawaii. The plant forms a rosette of blue-green leaves and a tall inflorescence with purple-blue flowers. If you're wondering how to propagate this plant, you have a few options.
1. Seed propagation
Germinating Cyanea sylvestris seeds can be a bit tricky, but it is possible. Collect seeds from mature plants or purchase them from a reputable source. To encourage germination, lightly scar the seed coat with sandpaper or a file and soak the seeds in water for several hours. Sow the seeds in a seed-starting mix and keep them consistently moist. Germination can take several weeks to several months, so be patient. Once the seedlings have developed several true leaves, they can be transplanted into individual containers to grow.
2. Division
Cyanea sylvestris can also be propagated through division of its clumps. Gently dig up the plant and divide it into smaller sections, making sure each section has some roots attached. Transplant the divisions into their containers filled with well-draining potting mix; water thoroughly and place in a bright, humid location.
3. Stem cuttings
Another way to propagate Cyanea sylvestris is through stem cuttings. Take a cutting of healthy, non-flowering stem and remove any lower leaves. Dip the cutting in rooting hormone powder and insert it into potting soil. Cover the pot with a clear plastic bag to create a mini greenhouse, which will help retain moisture. Mist the soil regularly to prevent it from drying out, and once the cutting develops roots, it can be transplanted in individual containers.
Regardless of the propagation method you choose, it is important to keep the young plants in a warm, humid environment with some indirect light. Once they have developed strong roots and leaves, you can gradually acclimate them to more light and less humidity before finally transplanting them outdoors.
Disease and Pest Management for Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer
Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer is a beautiful flowering plant that can be affected by various pests and diseases. To keep the plant healthy and thriving, it is important to implement effective disease and pest management strategies.
Common Diseases
The most common diseases that can affect Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer are fungal diseases such as leaf spot and powdery mildew. These diseases can cause discoloration and deformation of the leaves, which can eventually lead to reduced growth and poor health of the plant.
Leaf Spot
Leaf spot is caused by fungal infections and can occur when the leaves remain wet for extended periods of time. To prevent leaf spot, avoid overhead watering and provide adequate air circulation around the plant. If you notice any infected leaves, remove and destroy them immediately to prevent the spread of the disease.
Powdery Mildew
Powdery mildew is a common fungal disease that can affect the leaves, stems, and flowers of Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer. This disease can cause a white, powdery coating on the leaves and flowers, which can lead to reduced photosynthesis and poor growth. To prevent powdery mildew, avoid overhead watering and provide adequate air circulation around the plant. If you notice any infected leaves or flowers, remove and destroy them immediately.
Common Pests
The most common pests that can affect Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer are mealybugs and spider mites. These pests can cause damage to the leaves and flowers of the plant, which can lead to reduced growth and poor health.
Mealybugs
Mealybugs are small, white, cottony insects that can infest the leaves and stems of Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer. They can cause stunted growth, yellowing of leaves, and a general decline in plant health. To manage mealybugs, wipe the leaves and stems with a cotton swab dipped in rubbing alcohol. You can also spray the plant with an insecticidal soap or neem oil.
Spider Mites
Spider mites are tiny arachnids that can infest the leaves and flowers of Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer. They can cause discoloration, dryness, and webbing on the leaves. To manage spider mites, spray the leaves with a strong jet of water to dislodge them. You can also spray the plant with an insecticidal soap or neem oil.
Implementing effective disease and pest management strategies is critical to maintaining the health and beauty of Cyanea sylvestris Heller var. eriantha (Skottsberg) F. Wimmer. By being proactive and vigilant in monitoring your plant, you can prevent and manage any potential issues that may arise.
