Overview
Rochea biconvexa (Haw.) DC. is an evergreen succulent plant that belongs to the family of Aizoaceae. It is a small, low-growing plant that is often grown as a ground cover and is prized for its vibrant pink flowers that bloom in the summer.
Origin
R. biconvexa is native to South Africa and can be found growing wild in sandy and rocky soil in the Cape Peninsula. It is also commonly cultivated in many parts of the world including the United States, Europe, and Australia.
Common Names
This plant has a variety of common names including rosy dewplant, dew plant, rochea, and pink carpet.
Appearance
The rosy dewplant has a very low-growing, spreading habit, and can grow up to about 15 centimeters in height and up to 30 centimeters in width. The plant has small globular leaves that are pale green in color. When exposed to direct sunlight, the leaves turn reddish-brown. The flowers of R. biconvexa are usually a bright pink color and can be up to 2 centimeters in diameter. They bloom in clusters at the tips of the stems in the summer and are quite showy.
Uses
Rochea biconvexa is a popular ornamental plant that is often used in rock gardens, containers, and as a ground cover. It is drought tolerant and able to thrive in poor soils, making it a great choice for adding color and texture to dry landscapes. Additionally, its leaves and flowers are edible and can be used in salads.
Growth Conditions for Rochea biconvexa (Haw.) DC.
Light: Rochea biconvexa requires full to partial sunlight exposure for proper growth. It is best to keep the plant in a location where it can receive at least six hours of indirect sunlight every day. Too much direct sunlight can cause damage to the leaves and the plant may not thrive under low-light conditions.
Temperature: The ideal temperature for Rochea biconvexa is between 60°F to 75°F (15°C to 24°C). The plant is sensitive to frost so it may not survive in extremely cold temperatures. On the other hand, high temperatures above 80°F (26.6°C) can also be detrimental to the plant's growth.
Soil: For the best results, Rochea biconvexa requires a well-draining soil that is rich in organic matter. A soil mix with a pH level of 6.0 to 7.0 is preferred. The plant can tolerate slightly alkaline soil but does not do well in overly acidic soil. Adding perlite and sand to the potting mix can improve drainage and aeration for the roots.
Water: Rochea biconvexa enjoys a moderate amount of water. The top layer of soil should be kept moist, but not overly wet. Overwatering can lead to root rot and can be fatal for the plant. It is best to allow the soil to dry out a bit before watering it again. During the dormant period, the plant requires very little water.
Fertilizer: Fertilization is essential in the active growing season for Rochea biconvexa. Using a balanced liquid fertilizer or slow-release granular fertilizer every four to six weeks can provide the necessary nutrients for the plant's development. However, over-fertilization can lead to the salt buildup in the soil, which can harm the plant.
Cultivation methods
Rochea biconvexa (Haw.) DC. is a semi-succulent plant that requires well-draining soil and full sunlight to grow. It can grow in USDA hardiness zones 9a through 11b. The best time to sow Rochea biconvexa seeds is in early spring, where the temperature is warm. Sow the seeds in well-draining soil and keep them lightly watered until they start to germinate.
Watering needs
Rochea biconvexa requires moderate watering. During its growing period, water it thoroughly but allow the soil to dry before giving it more water. During the dormant season, reduce watering to prevent rotting of the roots. However, make sure that the soil does not dry out entirely.
Fertilization
Rochea biconvexa does not require heavy fertilization. Use a balanced fertilizer and apply it during the growing season, which is early spring to late summer. Follow the instructions on the label for proper application.
Pruning
Rochea biconvexa does not require heavy pruning. Pinch the tips of the plant to encourage bushy growth. Remove any dead or yellow leaves to allow more energy to be directed to the healthy parts of the plant. During the dormant season, prune back any stem growth that may have overgrown.
Propagation of Rochea biconvexa
Rochea biconvexa, also known as the wax flower, is a succulent plant that can be propagated through both sexual and vegetative methods.
Propagation by Seeds
The plant produces small black seeds that can be collected from the dried flower heads. After the seeds are collected, they can be sown in well-draining soil and kept moist until germination occurs. Germination usually takes 2-3 weeks, and the seedlings can be transplanted to individual pots once they are large enough to handle.
Propagation by Stem Cuttings
Rochea biconvexa can also be propagated through stem cuttings. Cuttings should be taken during the active growing season and allowed to callus over for a few days before being planted in well-draining soil. The cutting should be kept moist until roots develop, usually within 2-3 weeks. Once the cutting has developed sufficient root growth, it can be transplanted into a permanent container.
Propagation by Leaf Cuttings
Propagation by leaf cuttings is also possible, but it may take longer to produce a new plant compared to stem cuttings. To propagate using leaf cuttings, select a mature leaf and remove it from the parent plant. Insert the cut end of the leaf into well-draining soil and keep the soil moist until roots develop. Once roots have developed, a new plant will begin to emerge from the base of the leaf. It may take up to several months for the new plant to develop into a mature specimen.
Propagation by Division
Rochea biconvexa can also be propagated through division, but this method is typically used to rejuvenate an aging plant rather than to produce new specimens. Simply lift the plant from the soil and gently separate it into smaller sections. Each section should have its own roots and stems. The sections can then be planted in their own containers and cared for as individual plants.
Overall, Rochea biconvexa is a relatively easy plant to propagate through a variety of methods, making it an excellent choice for both novice and experienced gardeners.
Disease Management
Rochea biconvexa (Haw.) DC. is a hardy plant, but it can be susceptible to some diseases that can impact its growth. Some of the most common diseases that can affect the plant are fungal diseases such as powdery mildew and leaf spot. Powdery mildew is a white, powdery fungus that can cover the leaves of the plant and limit its ability to photosynthesize. Leaf spot, on the other hand, causes spots on the leaves of the plant that can lead to defoliation and stunted growth.
To manage these diseases, it is crucial to maintain proper cultural practices that can prevent their development. One of the most effective ways to prevent fungal diseases is to avoid overcrowding of the plant, which can limit air circulation and create a humid environment that the fungus thrives in. It is also essential to water the plant from below to prevent moisture from settling on the leaves, creating favorable conditions for the fungus to grow. Additionally, removing and destroying any infected leaves can help prevent the spread of the disease.
Pest Management
Rochea biconvexa (Haw.) DC. is also susceptible to some common pests that can damage the plant. Some of the most common pests that can affect the plant are spider mites, aphids, and mealybugs. Spider mites are tiny pests that feed on the sap of the plant and can cause leaf yellowing and defoliation. Aphids and mealybugs, on the other hand, also feed on the plant sap and cause distorted growth and the development of black sooty mold.
To manage these pests, it is crucial to monitor the plant regularly for their presence. One of the most effective ways to control spider mites is to use a strong spray of water to dislodge them from the plant. Aphids and mealybugs can be removed by wiping the plant with a cotton swab dipped in alcohol. Sticky traps can also be used to trap adult pests and prevent their re-infestation. Additionally, applying a regular insecticidal soap spray can help control and prevent the development of these pests.
