The Epiphyllum ‘Shark Fin’ (Epiphyllum chrysocardium) is a distinctive houseplant prized for its unique foliage. This tropical cactus features flat, broad, wavy stem segments resembling a shark’s fin. As an epiphyte, it naturally grows on other plants in its native Central and South American rainforests, absorbing moisture and nutrients from the humid air and collected debris.
Caring for Epiphyllum Shark Fin
Epiphyllum ‘Shark Fin’ thrives with specific care tailored to its epiphytic nature, ensuring healthy growth and potential for its large, often fragrant, white flowers.
Light Requirements
This plant prefers bright, indirect light, mimicking its natural habitat beneath larger trees. While it tolerates some direct morning sun, harsh midday or afternoon sun can scorch its stems, causing discoloration. Too much light may turn foliage red, while insufficient light results in leggy or weak growth. An east or north-facing window is ideal; south or west-facing windows can work with diffused light.
Watering Practices
Proper watering is essential for Epiphyllum ‘Shark Fin’, as it is sensitive to both overwatering and prolonged dryness. During the active growing season (spring through fall), allow the top one-third to half of the potting mix to dry out between waterings. In winter, reduce frequency, letting the soil dry more thoroughly to encourage future blooms. Overwatering causes root rot, indicated by yellowing or mushy stems; ensure adequate drainage.
Soil and Potting
As an epiphytic cactus, Epiphyllum ‘Shark Fin’ requires a well-draining, airy soil mix to prevent water stagnation. A suitable medium is a cactus or succulent mix amended with porous materials like perlite, pumice, or bark to enhance drainage and aeration. Standard potting soil is too compact and can cause root issues. When repotting, choose a container with drainage holes. These plants prefer to be somewhat root-bound, which promotes blooming. Repotting is typically needed every 2-7 years and is best done after flowering to minimize disturbance.
Temperature and Humidity
Epiphyllum ‘Shark Fin’ thrives in warm conditions, with preferred temperatures ranging from 65°F to 85°F (18°C to 29°C) during the growing season. While they tolerate typical household humidity, they appreciate moderate to high levels, reflecting their tropical origin. To increase humidity, mist the plant occasionally, place its pot on a pebble tray, or use a room humidifier. Avoid exposing the plant to temperatures below 50°F (10°C) or cold drafts, which can cause shock and hinder growth.
Fertilization Needs
During the spring and summer growing season, fertilize your Epiphyllum ‘Shark Fin’ with a balanced liquid fertilizer (e.g., 10-10-10) every 2-4 weeks. Switch to a higher phosphorus fertilizer (e.g., 2-10-10) in late fall or early winter to encourage blooming. Dilute the fertilizer to half strength to avoid burning the plant. Cease fertilization completely during the plant’s dormant winter period.
Propagating Epiphyllum Shark Fin
Propagating Epiphyllum ‘Shark Fin’ is done through stem cuttings. The ideal time is during the active growing season, typically in spring or early summer.
Begin by selecting a healthy stem segment, 6 to 9 inches long, and make a clean cut with sterilized pruning shears. Allow the cut end to callus over or dry for 3-7 days in a warm, dry place away from direct sunlight. This prevents rot once planted.
Once callused, plant the cutting 1 to 2 inches deep into a well-draining potting mix, similar to that for mature plants. Keep the mix barely damp, not soggy, to encourage root development without rot. Mist the cutting initially before light watering begins once roots form, which can take 1-6 weeks. New growth indicates rooting has occurred.
Troubleshooting Common Issues
While Epiphyllum ‘Shark Fin’ is resilient, common issues often relate to environmental conditions or care. Yellowing stems can signal overwatering, leading to root rot, especially if soft or mushy. Conversely, shriveled or puckered stems suggest the plant is thirsty.
Lack of growth or leggy, weak stems points to insufficient light; move the plant to a brighter location with filtered light. Reddening stems indicate too much direct light exposure, prompting a move to a shadier spot.
Stem rot (soft, discolored, or mushy sections) results from overwatering or poor drainage. Trim affected areas with sterilized tools, allow cuts to callus, then repot into fresh, well-draining soil. Fungal spots can appear, exacerbated by wet foliage; water the soil directly and ensure good air circulation. Pests like mealybugs, aphids, and spider mites affect Epiphyllum, requiring appropriate horticultural solutions.