Overview
Reynoldsia sandwicensis Gray, also known as `Ohe or `Ohe mauka, is a rare Hawaiian plant species that belongs to the olive family (Oleaceae). The name "Reynoldsia" is in honor of a botanical collector, John Reynolds, who worked in Hawaii during the mid-1800s.Appearance
Reynoldsia sandwicensis is a small tree or shrub that can reach up to 10 meters in height. This plant has a narrow and upright structure with a single or multiple main stems. The leaves are dark green and glossy with a lanceolate shape, measuring up to 10 cm long and 2 cm wide. The flowers of Reynoldsia sandwicensis bloom between April and August, producing small and tubular white flowers that display a sweet fragrance.Distribution and Habitat
Reynoldsia sandwicensis is endemic to Hawaii and is found at elevations of 610 to 2,500 meters on the islands of Kaua?i, O?ahu, Maui, and Hawai?i. This plant prefers wet and mesic forest habitats, and it is commonly found along streams and wet slopes.Uses
Reynoldsia sandwicensis is an important cultural and medicinal plant in Hawaii. The plant's bark and leaves have been traditionally used for treating stomach and intestinal problems, fever, and sore throat. The wood of Reynoldsia sandwicensis was once used as a material to make spears and walking sticks. Nowadays, the plant is used mainly for ornamental and landscaping purposes, but its conservation remains a priority due to its limited distribution and importance in Hawaiian culture.Typical Growth Conditions of Reynoldsia sandwicensis Gray
Reynoldsia sandwicensis Gray, commonly known as `Ohe, is a species of flowering plant in the family Rhamnaceae. It is a small tree or shrub that is native to Hawaii and grows up to 10 m in height.
Light Requirements
Reynoldsia sandwicensis Gray prefers partial to full sun exposure. It can tolerate some shade, but too much shade can cause the plant to become leggy and weak. Direct sunlight is essential for the plant to produce flowers and fruits.
Temperature Requirements
Reynoldsia sandwicensis Gray is a tropical plant and thrives in warm temperatures. It prefers a warm and humid climate with average temperatures between 70 and 80 °F. The plant can tolerate temperatures as low as 60 °F but may die if exposed to freezing temperatures for an extended period.
Soil Requirements
Reynoldsia sandwicensis Gray prefers well-draining soil that is rich in organic matter. It can grow in a range of soils from sandy to loamy, as long as it is well-draining. The plant does not tolerate waterlogging and may die if planted in soil that is too wet. Adding organic matter to the soil can improve its fertility and drainage.
Overall, Reynoldsia sandwicensis Gray is a low-maintenance plant that can tolerate a range of growing conditions, making it an ideal choice for gardens in tropical climates.
Cultivation of Reynoldsia sandwicensis Gray:
Reynoldsia sandwicensis Gray, commonly known as 'Ohe Makai, is a small tree that can be grown in a variety of soil types, including sandy or rocky soils, and well-drained soil. This plant is indigenous to Hawaii, but it can also grow in many other tropical regions. It does well in full sun or partly shaded locations, but it is more tolerant to the shade than most other trees.
Watering Reynoldsia sandwicensis Gray:
The watering requirements for the plant change depending on the weather and soil conditions. During the hot, dry season, the trees may need frequent watering to keep them from drying out. However, during the wet season, excessive watering can lead to root rot, so it is crucial to monitor the soil moisture level and adjust the watering accordingly. It is a good idea to apply water slowly and deeply to allow it to penetrate the soil and reach the roots.
Fertilization of Reynoldsia sandwicensis Gray:
Reynoldsia sandwicensis Gray needs regular fertilization to maintain its health and growth. A general-purpose fertilizer with a balanced ratio, such as nitrogen, phosphorus, and potassium, can be added to the soil during the growing season. Fertilizers must be added carefully, as excessive use can lead to root burn or high salt levels in the soil.
Pruning Reynoldsia sandwicensis Gray:
Pruning of Reynoldsia sandwicensis Gray is necessary to promote bushy and compact growth. It is also an essential care practice in controlling the plant's size and shape. Pruning can be done during the dormant season before the new growth starts, removing any dead, unhealthy, or crossing branches. It is recommended to avoid pruning extensively on the plant, as excessive pruning can lead to reduced flowering and even damage to the tree.
Propagation of Reynoldsia sandwicensis Gray
Reynoldsia sandwicensis Gray, commonly known as 'ohe mauka, is a rare and endemic plant species that is native to Hawaii. It is a long-lived tree that can grow up to 30 feet tall. The plant can be propagated by several methods, including seeds, cuttings, and grafting.
Propagation from seeds
Propagation from seeds is the most common method used to propagate Reynoldsia sandwicensis Gray. The seeds of the plant are collected when they are mature, which is typically in the fall. The seeds should be planted in a well-draining mix, either in pots or directly in the ground. The seeds should be kept moist but not wet and placed in a warm and shaded area. The germination process may take several months.
Propagation from cuttings
Propagation from cuttings is an alternative way to propagate Reynoldsia sandwicensis Gray. The cuttings should be taken from the plant during the summer months when the plant is actively growing. The cuttings should be 6-8 inches long and taken from the semi-hardwood of the plant. The cuttings should be dipped in rooting hormone and then planted in a well-draining rooting mix. The cuttings should be kept moist and placed in a shaded and warm area. The rooting process may take 6-8 weeks.
Propagation by grafting
Propagation by grafting is a more complex method of propagation that requires expertise and skill. It involves attaching a piece of the desired plant onto the rootstock of another plant. This method is typically used for propagating rare or difficult-to-grow plants. The success of this method depends on the compatibility between the plant and the rootstock. Grafting should only be attempted by experienced growers or professionals.
Disease Management for Reynoldsia sandwicensis Gray
Reynoldsia sandwicensis Gray, commonly known as kulu‘?, is known to be susceptible to a few diseases. One of the most common diseases is the leaf spot, caused by the fungus Phyllosticta reynoldsiae. The symptoms include small yellow to brown spots on the leaves, which later develop into larger brownish spots with light centers. The infected leaves may curl and drop prematurely.
The best way to manage leaf spot disease is to remove and destroy the infected plant parts. Fungicides like copper-based or sulfur-based can be used to control the disease. However, it is essential to follow the product label instructions strictly to avoid causing harm to the plant.
Pest Management for Reynoldsia sandwicensis Gray
Another common problem that affects Reynoldsia sandwicensis Gray is pest infestation. Some of the pests that can attack this plant include mealybugs, scales, spider mites, and whiteflies. These pests feed on the sap of the plant, causing the leaves to drop, and eventually, lead to stunted growth and death.
To manage pest infestation, it is crucial to keep the plant healthy and well-nourished. Regularly inspect the plant to detect the pests' presence early enough, and immediately isolate the infected plant from the healthy ones. Natural predators like ladybugs or lacewings can be introduced into the garden to control the pests. Chemical insecticides can also be used, but caution should be exercised when using them. Use only the recommended products and follow the instructions on the label carefully to avoid harming the plant, environment, or harming beneficial insects.
