How to Grow and Care for Hoya Rubida

Hoya rubida is a desirable plant for collectors and new enthusiasts. Despite its reputation as a sought-after species, its straightforward care makes it an accessible addition to an indoor garden. This vining plant is appreciated for its appealing foliage that brings texture and color to a space.

Identifying Hoya Rubida

Native to Southeast Asia, Hoya rubida is identified by its distinct leaves and growth pattern. The leaves are lanceolate, or spear-shaped, though they can also appear more ovate. They have a succulent quality and a slightly fuzzy texture.

Leaf coloration is a deep, solid green, but under higher light conditions, they can develop reddish or bronze tones. This plant has a vining or trailing habit, making it suitable for hanging baskets or a trellis. The leaves measure between 3 to 6 centimeters in length and 2 to 3 centimeters in width.

Ideal Growing Conditions

Light

Proper lighting is a factor in the health and appearance of Hoya rubida. The plant thrives in bright, indirect light, and an east-facing window with gentle morning sun is an ideal location. Too much harsh, direct sunlight can lead to leaf scorch. Conversely, insufficient light will slow its growth and reduce the likelihood of it producing flowers. If you notice the vibrant color of the leaves fading or the plant becoming leggy, it is an indication that it needs a brighter location.

Soil

The right soil mix is important for Hoya rubida, as it is an epiphyte in its natural habitat. This means it grows on other plants and requires a growing medium that is chunky, airy, and well-draining to prevent its roots from stagnating in water. A standard potting mix is often too dense and can lead to root rot. To create a suitable environment, a mix combining orchid bark, perlite, and coco coir or peat is effective.

Water

Watering practices for Hoya rubida are guided by a “drench and dry” methodology. This involves thoroughly watering the plant until water runs out of the drainage holes and then allowing the soil to dry out almost completely. The succulent nature of its leaves allows the plant to store water, making it more tolerant of dry conditions. Overwatering is a common problem and can lead to root rot.

Before watering, check the soil’s moisture level by inserting a finger about an inch or two deep. If the soil feels dry, it is time to water. During winter, when the plant’s growth slows, reduce the frequency of watering.

Temperature and Humidity

As a tropical plant, Hoya rubida performs best in warm and humid conditions. The temperature range for this plant is between 65°F and 85°F (18°C to 29°C). It should be protected from cold drafts and sudden temperature drops, as temperatures below 59°F (15°C) can hinder its development.

While it prefers moderate to high humidity, Hoya rubida is adaptable to average household humidity levels. To increase ambient moisture, you can group it with other plants, use a pebble tray filled with water, or run a humidifier nearby. Regular misting can also help, but ensure there is adequate air circulation to prevent fungal issues.

Fertilizer

To support its growth during the spring and summer growing season, Hoya rubida benefits from regular feeding. A balanced liquid fertilizer provides the necessary nutrients. It is best to dilute the fertilizer to half-strength to avoid over-fertilization, which can burn the roots. Fertilizing once a month during its active growth period is sufficient. During the fall and winter months, suspend fertilizing as the plant’s growth slows.

Encouraging Blooms

The blooms appear in clusters of delicate, star-shaped flowers that are a soft pink or salmon color with a contrasting deep red corona at the center. These flowers may also possess a subtle fragrance. Consistent care encourages blooms, with adequate light being an important factor. Allowing the plant to become slightly root-bound in its pot can also trigger flowering. Patience is needed, as a young plant may take time to mature before it is ready to bloom.

Propagation and Repotting

Propagating Hoya rubida is successfully done through stem cuttings. To do this, select a healthy vine and cut a section that includes at least one or two nodes, the small bumps on the stem where leaves and roots emerge. You can root the cutting in either water or a well-draining soil medium. Keeping the cutting in a warm, bright location will encourage root development.

Repotting should be done infrequently, every two to three years or when the plant has become severely root-bound. Hoyas prefer to be snug in their pots, and repotting too soon can cause unnecessary stress. When it is time to repot, choose a container that is only slightly larger than the previous one. Gently remove the plant and place it in the new pot with a fresh, appropriate soil mix.

Common Issues

Pests are a common issue, with mealybugs and spider mites being two of the most frequent culprits. These pests can be managed by wiping them off with a cotton swab dipped in isopropyl alcohol or by using insecticidal soap.

Another problem is yellowing leaves, which is a direct sign of overwatering. If you notice leaves turning yellow and feeling soft, it is a strong indication that the roots are too wet. This can lead to root rot if not addressed promptly. Inspecting the plant regularly allows for early intervention.