Origin
Pittosporum forbesii Sherff, also known as Forbes' Pittosporum, originated in the Hawaiian Islands and is native to the islands of Maui, Molokai, and Lanai.
Common Names
Aside from Forbes' Pittosporum, this plant is also known by its Hawaiian name 'oha wai' and the common name Hawaiian cheesewood.
Appearance
This evergreen shrub can grow up to 30 feet tall and 20 feet wide. Its leaves are glossy, dark green, and oval-shaped. The plant produces small, fragrant, white flowers that grow in clusters. The flowers are followed by small, round fruit that splits open to reveal small, sticky seeds.
Uses
Forbes' Pittosporum is commonly used as an ornamental plant in landscaping due to its attractive foliage and fragrant flowers. It is also used in traditional Hawaiian medicine to treat skin ailments, such as wounds and rashes. Additionally, the plant's wood can be used to make small objects such as crafts and utensils.
Light Requirements
Pittosporum forbesii Sherff thrives in bright, indirect light environments. The plant can handle partial shade, but it needs sufficient light to achieve the best growth of its leaves and flowers. A minimum of four hours of daylight every day is necessary for this plant to thrive.
Temperature Requirements
The ideal temperature range for Pittosporum forbesii Sherff falls within 60 to 75 °F. This plant needs consistent temperatures and doesn't tolerate sudden temperature changes or frost. It can handle slight temperature fluctuations but will not sustain in temperatures below 50 °F. On the other hand, high temperatures, especially above 80 °F, can harm the plant's overall health.
Soil Requirements
Pittosporum forbesii Sherff requires well-draining and slightly acidic soil with a pH range of 5.5-6.5 for optimal growth. The plant thrives in loamy soils that have high organic matter content. Inadequate drainage leads to root rot, which can harm the plant's health. Adding perlite, sand, or vermiculite to the soil can improve the drainage of the soil, thus improving the plant's growth.
Cultivation of Pittosporum forbesii Sherff
Pittosporum forbesii Sherff is a small evergreen tree that is indigenous to Hawaii. It has a moderate growth rate and can grow up to 20 feet in height if not maintained. To cultivate Pittosporum forbesii Sherff successfully:
- Plant it in well-draining soil that's rich in organic matter. It thrives in slightly acidic to neutral soil conditions, with a pH range of 6.0 to 7.5.
- Ensure that it receives full sunlight or partial shade. It prefers the sunlight, but it can survive under partly shaded conditions.
- Space the trees at least 6 to 8 feet apart to provide ample room for growth and air circulation.
- Water the trees regularly to keep the soil consistently moist, but not waterlogged. It can tolerate mild drought conditions, but excessive waterlogging may cause root rot.
- Plant Pittosporum forbesii Sherff out of windy areas since it is highly susceptible to wind damage.
Watering Needs
The water requirements for Pittosporum forbesii Sherff depend on several factors like the prevailing climatic conditions, soil type, and drainage. To ensure that the tree gets the right amount of water:
- Water the tree deeply once every week during the growing season and twice a week during extreme hot weather.
- If there is enough rainfall, you may reduce your watering frequency.
- Pay attention to the moisture level in the soil. If it feels dry, water the tree until it reaches a depth of at least six inches.
- Reduce watering frequency during the dormant season to prevent fungal growth.
Fertilization
Fertilization promotes vigorous growth, strengthens the tree roots, and improves its overall health. To fertilize Pittosporum forbesii Sherff:
- Apply a complete slow-release fertilizer, high in nitrogen and potassium, during the growing season for optimal growth and foliage.
- Follow the recommended fertilizer application rate indicated on the package. Over-fertilizing can burn the roots and weaken the plant.
- Water soluble fertilizers may be used to supplement the tree's nutrient uptake, but they need more frequent application.
- Spread compost and organic matter around the base of the tree. This enhances soil nutrients and moisture retention while preventing weed growth.
Pruning
Pruning controls the size and shape of Pittosporum forbesii Sherff and maintains its health and neat appearance. Here are some tips for pruning:
- Prune the tree lightly during the growing season to remove any diseased or damaged growth.
- Remove any dead or crossing branches to improve airflow and reduce the chances of pests and diseases spreading.
- Prune the shrub to maintain the desired height and shape. This should be done during the dormant season to spur new growth in the spring.
- Do not prune more than 1/3 of the shrub at any time as it may affect its health and growth.
Propagation of Pittosporum forbesii Sherff
Pittosporum forbesii Sherff is a slow-growing evergreen shrub that is native to the Hawaiian Islands. While it can reach heights of up to 20 feet in the wild, it typically grows to about 6-8 feet in cultivation. Propagation of this plant can be achieved through various methods.
Seeds
The most common propagation method for Pittosporum forbesii Sherff is through seeds. These must be collected when the fruit is fully mature and can be sown immediately. Before planting, the seeds must be cleaned and soaked in water for a few hours to soften the outer coat. This will help in germination. Sow the seeds in a well-draining soil mix and keep it moist but not waterlogged. Germination can take two to three months.
Cuttings
Pittosporum forbesii Sherff can also be propagated through cuttings. Take cuttings in the spring, when the plant is actively growing. Cut a 6-inch section from the tip of a healthy stem, making sure it has at least three nodes. Remove the lower leaves and dip the cut end in rooting hormone. Plant the cutting into a well-draining soil mix and keep it moist. Cover the pot with plastic to maintain humidity. The cutting should root in two to three months.
Air Layering
Air layering is another propagation method for Pittosporum forbesii Sherff. Choose a healthy branch and make a cut halfway through the stem, just below a node. Apply rooting hormone and wrap the cut section with moist sphagnum moss. Wrap with plastic and secure both ends with twist ties. Roots should form in six to eight weeks, at which point the new plant can be cut and potted up.
Division
Pittosporum forbesii Sherff can be propagated through division. In this method, the plant is dug up and the root ball is divided into smaller sections. Each section must have a portion of the stem and a good root system. Replant the sections in well-draining soil and keep it moist. Make sure to protect from direct sunlight as the plant establishes new root systems.
Disease and Pest Management for Pittosporum forbesii Sherff
Pittosporum forbesii Sherff, commonly known as Forbes' pittosporum, is a small evergreen tree belonging to the family Pittosporaceae. It is native to the Hawaiian Islands and grows well in warm, tropical climates.
Common Diseases
There are several diseases that may affect Pittosporum forbesii Sherff. The most common ones include:
Leaf Spot
This is a fungal disease that causes circular or irregular brown spots on the leaves. Leaf spot can be managed by removing and disposing of infected leaves and reducing humidity by improving air circulation around the plant.
Phytophthora Root Rot
This is a soil-borne disease that causes the roots to rot, leading to wilting, yellowing, and eventual death of the plant. To prevent Phytophthora root rot, ensure proper drainage, avoid overwatering, and treat the soil with fungicides.
Common Pests
Pittosporum forbesii Sherff is also susceptible to several pests, including:
Mealybugs
Mealybugs are small, white, cottony pests that suck sap from the leaves and stems of the plant, causing stunted growth and yellowing of the leaves. They can be managed by washing the plant with soapy water or using insecticides. It is also important to remove any heavily infested plant material and dispose of it appropriately.
Scale Insects
Scale insects are small, hard-shelled pests that attach themselves to the leaves and stems of the plant, feeding on the sap and causing stunted growth and yellowing of the leaves. They can be managed by washing the plant with soapy water or using insecticides. It is also important to remove any heavily infested plant material and dispose of it appropriately.
In conclusion, Pittosporum forbesii Sherff can be affected by various diseases and pests. By following good cultural practices, such as proper watering and fertilization, and promptly addressing any issues that arise, including using appropriate treatments, you can manage disease and pest problems and ensure a healthy plant.
