Origin and Common Names
Dubautia platyphylla (Gray) Keck is a flowering plant species that belongs to the family Asteraceae. It is commonly known as the thick-leaved dubautia and is endemic to the Hawaiian Islands, specifically on the islands of Maui and Molokai. The plant can be found in a variety of habitats, including dry shrublands, mesic and wet forests, and subalpine tundra.General Appearance
The Dubautia platyphylla (Gray) Keck is a shrub that can grow up to 6.6 feet (2 meters) tall and is characterized by its thick, leathery leaves that range from 1.2 to 4 inches (3-10 cm) long and 0.4 to 1.2 inches (1-3 cm) wide. The plant produces yellow to orange flowers that grow in clusters at the stem tips. It blooms from May to September.Uses
The Dubautia platyphylla (Gray) Keck has no known direct uses for humans, but it plays an important role in the Hawaiian ecosystem. The plant provides habitat and food for native insects and birds. The shrub is also valued for its ornamental qualities and is often used in landscaping projects, especially in Hawaii. In recent years, the Dubautia platyphylla (Gray) Keck, like many other species of Hawaiian plants, has been threatened by habitat destruction, invasive species, and climate change. Conservation efforts have been put in place to protect the species from extinction, including the establishment of protected areas and the removal of invasive plant species.Light Requirements
Dubautia platyphylla (Gray) Keck typically grows in full sunlight or partial shade. The plant can tolerate some shade, but it tends to grow best in areas with abundant exposure to sunlight.
Temperature Requirements
The plant is native to Hawaii and grows best in a tropical or subtropical climate. Dubautia platyphylla (Gray) Keck is sensitive to cold temperatures and cannot survive in areas with extended periods of frost or freezing temperatures. The ideal temperature range for the plant is between 60°F (15°C) – 80°F (27°C).
Soil Requirements
Dubautia platyphylla (Gray) Keck prefers well-drained soil that is rich in organic matter. The soil should be slightly acidic with a pH range between 5.5 – 6.5. The plant can grow in a variety of soil types, including sandy, loamy, or clay soils, provided they are well-drained. However, the plant does not tolerate waterlogged soil or standing water, which can lead to root rot.
Cultivation Methods for Dubautia Platyphylla
Dubautia platyphylla is a shrub endemic to the western part of Hawaii, and it grows in areas free from lava or rocks. For successful cultivation, here are some methods to consider:
- The plant thrives in full sunlight or a partially shaded spot.
- It is resistant to drought, but it requires well-draining soil that retains moisture.
- Plant the Dubautia platyphylla in an appropriate location, such as an area with shelter from heavy winds and where there is adequate space for the roots to expand.
- It is susceptible to pests and diseases, so it is necessary to inspect the plant regularly for any signs of damage.
- Propagate the plant through cuttings or seeds, using potting soil or vermiculite.
Watering Needs
The Dubautia platyphylla plant requires proper watering for growth and health. Here are some tips on how to water it:
- Water the plant deeply, but infrequently, allowing the soil to dry before the next watering session.
- If there is a prolonged drought period, increase the frequency of watering and reduce the amount of water in each session.
- Observe the leaves for any signs of drooping or wilt, as these indicate underwatering. Conversely, yellowing leaves signify overwatering.
- Water the plant in the early morning or late evening to prevent water loss due to evaporation.
Fertilization
The Dubautia platyphylla plant requires regular feeding for optimal growth and development. Here are some guidelines to follow:
- Fertilize the plant once every three months using a balanced fertilizer, such as 10-10-10.
- If possible, use organic fertilizers such as compost, manure, or fish emulsion.
- Apply the fertilizer to moist soil and water immediately to prevent root burn.
- Avoid over-fertilizing the plant, which can lead to root damage or leaf scorching.
Pruning
Pruning is essential in maintaining the shape and size of the Dubautia platyphylla plant. Here are some things to keep in mind:
- Prune the plant during its dormancy period, which is typically in late winter or early spring.
- Cut off any dead, damaged, or diseased branches using a clean and sharp pruner or lopper.
- Shape the plant by removing any unwanted or overgrown branches, such as those that cross each other or block sunlight to the interior of the shrub.
- Prune the plant from the top down, maintaining the natural shape and structure of the shrub.
Propagation of Dubautia Platyphylla (Gray) Keck
Dubautia platyphylla is a low-growing subshrub that can be easily propagated through various means.
Seed Propagation
The most common method to propagate Dubautia platyphylla is through seeds. Seeds need to be collected in the late summer or early fall when the flower heads have matured. The seeds should be planted in a well-draining soil mix and kept moist. They should be placed in an area with filtered light and at a temperature of around 70°F. It may take several weeks for the seeds to germinate.
Cutting Propagation
Another method to propagate Dubautia platyphylla is through stem cuttings taken from a mature plant. Spring is the best time to take the cuttings. Cut a 3-4 inch long cutting just below a node and strip off the lower leaves. The cutting should be treated with a rooting hormone and planted in well-draining soil. Keep the soil moist and place the cutting in filtered light. It may take several months for the cutting to develop roots and new growth.
Division Propagation
Division propagation is another way to propagate Dubautia platyphylla. This method involves separating a mature plant into smaller sections, each containing roots and shoots. Take care to avoid damaging the roots. Each section can be planted in a well-draining soil and kept moist. Place the new plants in filtered light. It may take several weeks for new growth to appear.
Regardless of the propagation method used, care should be taken to provide adequate water, light, and nutrients to the new plants. It may take several months for the new plants to become established.
Disease Management
Dubautia platyphylla is relatively resistant to common garden diseases, although a few pests and diseases may occasionally attack this plant. One disease that may attack this plant is Fusarium wilt, which is caused by a fungal pathogen. The symptoms of the disease include wilting, stunting, yellowing of the leaves, and eventual death of the plant. Proper watering and sanitation can help prevent this disease from taking hold. Crop rotation with non-susceptible plants every few years can also be helpful to reduce the incidence of this disease.
Pest Management
Although Dubautia platyphylla is generally not heavily impacted by pests, there are a few insects to be aware of. One common pest that may attack this plant is the spider mite. These small, needle-like insects can attack the plant's leaves, leaving behind webbing and discoloration. Horticultural oils and insecticidal soaps can be effective at controlling spider mites. Another pest that may attack this plant is the leaf-mining fly. This pest lays its eggs on the leaves of the plant, and the larvae tunnel into the leaves, causing discolored blotches. Removing infected leaves and disposing of them in sealed plastic bags can help control the spread of this pest.
