Origin
Tetraplasandra oahuensis (Gray) H.A.T. Harms var. longipes Sherff, commonly known as `ohe in Hawaii, belongs to the Araliaceae family of plants. This plant is endemic to the Hawaiian Islands and can be found on all major islands except for Kauai.
Common Names
The plant Tetraplasandra oahuensis is known by several different common names including `ohe (Hawaiian), Hawaiian Schefflera, Palapalai, Hapu`u `i`iwi, Adaptable Aralia, Umbrella plant, and Octopus tree.
Uses
Tetraplasandra oahuensis is an important plant in the ecological system of Hawaii as it provides habitat for several native bird species, including the endangered `i`iwi. The leaves of this plant are used for making traditional Hawaiian leis and the wood is used in the production of tools, bowls, and other handmade crafts.
General Appearance
Tetraplasandra oahuensis var. longipes is a tree that can reach up to 25 meters in height and 50 cm in diameter. It has a smooth, light brown bark that is spotted with lenticels. The leaves are large and grouped at the end of the branches, measuring up to 0.5 meters in length and width. The leaves are brightly colored with green on the top side and a lighter shade of green on the underside. The flowers of the `ohe are small and white, and the fruit is usually purple or black, measuring around 1 cm in diameter.
Light Requirements
Tetraplasandra oahuensis var. longipes thrives best in partial shade to full shade. Direct sunlight can scorch the leaves and hinder the plant's growth. Therefore, it is best to place the plant in a partially shaded area, or in a spot with bright, indirect light.
Temperature Requirements
This plant is native to tropical climates, so it needs warm and humid conditions to flourish. The ideal temperature range for Tetraplasandra oahuensis var. longipes is between 65°F to 80°F (18.3°C to 26.7°C). It is essential to maintain a consistent temperature and avoid sudden drops in temperature.
Soil Requirements
Tetraplasandra oahuensis var. longipes prefers well-draining soil rich in organic matter. The soil should be kept moist but not waterlogged. It is best to avoid using heavy soils that do not allow sufficient drainage, as they can cause root rot.
Cultivation and Care of Tetraplasandra oahuensis (Gray) H.A.T. Harms var. longipes Sherff
Tetraplasandra oahuensis (Gray) H.A.T. Harms var. longipes Sherff, commonly known as Oahu tetraplasandra, is a member of the Araliaceae family. It is a rare species native to Hawaii and is critically endangered. Cultivating and caring for this plant is crucial to its survival.
Propagation
The Oahu tetraplasandra can be propagated by stem cutting and air layering. Stem cutting involves taking a cutting from the plant's stem and allowing it to root in a moist, well-draining potting mix. Alternatively, air layering involves creating a small wound on the stem, packing it with moist sphagnum moss, and allowing roots to grow. The rooted cutting can be transplanted into a larger pot or directly into the ground.
Watering
The Oahu tetraplasandra requires regular watering, especially during dry weather. It prefers moist but well-draining soil and should not be allowed to dry out completely. Overwatering can lead to root rot, so it's crucial to find a balance and monitor the soil moisture regularly.
Fertilization
The Oahu tetraplasandra benefits from regular fertilization with a balanced, slow-release fertilizer. Fertilize once every three months during the growing season to encourage healthy growth. Avoid over-fertilizing, as this can cause damage to the plant.
Pruning
Tetraplasandra oahuensis (Gray) H.A.T. Harms var. longipes Sherff may need occasional pruning to maintain its shape and prevent it from becoming too leggy. Pruning should be done in the spring or early summer, just after the plant has finished flowering. Focus on removing dead or damaged branches and pinching back the tips of stems to encourage branching.
Propagation of Tetraplasandra oahuensis var. longipes Sherff
Tetraplasandra oahuensis var. longipes Sherff, also known as Oahu tetraplasandra, is a plant species native to Hawaii. It is a small tree or a large shrub that can grow up to 10 meters tall. The plant is known for its attractive foliage and ornamental qualities, making it a popular choice for horticultural enthusiasts.
Propagation Methods
The propagation of Tetraplasandra oahuensis var. longipes Sherff can be done using several methods. These include:
1. Seed Propagation:
Seeds of Tetraplasandra oahuensis var. longipes Sherff can be collected from the plant's mature fruits. The seeds should be sown in nutrient-rich soil in a well-draining container. Keep the soil moist but not waterlogged and place the container in a warm and sunny location. The seeds will germinate within 4 to 6 weeks, and you can transplant them into individual containers once they develop into seedlings.
2. Cutting Propagation:
Cutting propagation is another effective way of propagating Tetraplasandra oahuensis var. longipes Sherff. You can take stem cuttings from mature and healthy plants during the growing season. Make sure each cutting has at least 3 to 4 nodes and remove the lower leaves and branches. Dip the cuttings in rooting hormones and plant them in a well-draining potting mix. Water them and place them in a warm and bright location with indirect sunlight. The cuttings should develop roots within 4 to 6 weeks, and you can transplant them into individual containers.
3. Air Layering:
Air layering is another propagation method that works well for Tetraplasandra oahuensis var. longipes Sherff. Select a healthy and mature branch and remove a section of bark from the middle of the stem. Apply rooting hormone to the exposed section and cover it with damp sphagnum moss. Wrap it with plastic wrap to keep the moisture in and secure it tightly with twine. Keep the moss moist, and roots will develop in 4 to 6 weeks. Cut the rooted stem from the parent plant and plant it in a well-draining container.
Propagation of Tetraplasandra oahuensis var. longipes Sherff can be challenging, but with the right technique and conditions, you can grow new plants successfully.
Disease Management
Tetraplasandra oahuensis is relatively resistant to most plant diseases. However, it can still be affected by root rot and leaf spots caused by fungal infections. Planting the species in well-drained soil and preventing over-watering can prevent root rot. As a preventive measure, leaves should be kept dry because fungi thrive on moisture. That means avoiding overhead watering and using a soaker hose or drip irrigation system if possible. Fungicide sprays can also help to control leaf spots and other fungal diseases.
Pest Management
One of the most common pests that threaten Tetraplasandra oahuensis is the scale insect. These pests suck sap from the plant's stems, disrupting its ability to grow and reproduce. To control scale insects, look out for signs such as honeydew, a sugary substance secreted by the pests. Once infested, the plant can be sprayed with horticultural oil or insecticidal soap. Repeat sprays may be needed every ten days to catch any newly hatched pests.
Another common pest that may affect Tetraplasandra oahuensis is the spider mite, which feeds on plant sap and can cause wilting and yellowing of leaves. To manage spider mites, avoid over-fertilizing the plant, as mites thrive on lush, nitrogen-rich foliage. Pruning away heavily infested areas of the plant and washing the leaves with water can also help control the pest. If infestation is severe, insecticides such as neem oil can be sprayed to kill the pests.
Finally, caterpillars may also occasionally attack Tetraplasandra oahuensis. These pests can be treated with Bacillus thuringiensis or other appropriate insecticides. It is important to follow the product label's instructions and avoid using too much of the insecticide, which can cause damage to the plant itself.
