The Philodendron gloriosum ‘Dark Form’ is a striking houseplant. Its large, heart-shaped leaves feature a deep, velvety green hue, beautifully contrasted by prominent, often white or pinkish, veins. This plant exhibits a unique crawling growth habit.
Understanding Philodendron Gloriosum Dark Form
The ‘Dark Form’ differs from other Philodendron gloriosum varieties. Its leaves display a deeper, more intense green, sometimes appearing almost black with maturity. The veining is often more pronounced and extends further to the leaf margins, and the leaf shape can be rounder with a flatter texture.
Native to the tropical rainforests of Colombia and parts of Central and South America, this plant thrives in humid, shaded understories. It grows horizontally along the forest floor. This crawling, rhizomatous growth habit sets it apart from vining or upright philodendrons, as its stem creeps along the soil surface rather than climbing.
Caring for Your Philodendron Gloriosum Dark Form
Light Requirements
Philodendron gloriosum ‘Dark Form’ thrives in bright, indirect light. Placing it near an east-facing window provides gentle morning light. If positioned near south or west-facing windows, filter the light with a sheer curtain or place the plant a few feet away. Direct sunlight can scorch the delicate velvety leaves.
Insufficient light can lead to slow growth and less vibrant leaf coloration. Too much light might cause the leaves to lose their deep pigmentation.
Watering Practices
Allow the top few inches (1 to 2 inches or 2-3 cm) of soil to dry out between waterings. Overwatering is a common issue leading to root rot, often indicated by yellowing or drooping leaves.
When watering, thoroughly soak the plant until water drains from the pot’s bottom; this helps flush out accumulated salts. Underwatering can cause leaves to wilt or become crispy. Monitor soil moisture consistently.
Ideal Soil Mix
The ideal soil mix for Philodendron gloriosum ‘Dark Form’ is well-draining, airy, and rich in organic matter. Such a mix prevents waterlogging while providing essential nutrients and aeration for the roots. Components like coco coir, perlite, and orchid bark are excellent for creating this structure. A common recommendation is a blend containing approximately 60% draining material mixed with potting soil.
Horticultural charcoal can also be added to the mix, which helps guard against bacteria and fungus by absorbing toxins. This chunky, loose mix supports the plant’s rhizomatous growth habit by allowing its roots to spread and breathe. Proper drainage is crucial to avoid issues like root rot.
Temperature and Humidity
Philodendron gloriosum ‘Dark Form’ thrives in warm and humid environments, mimicking its native rainforest conditions. An ideal temperature range is 18°C to 27°C (65-80°F). The plant is sensitive to cold temperatures and sudden drafts, so keep it away from windows or doors that experience abrupt temperature changes.
High humidity levels, preferably between 60-80%, are beneficial for its health and appearance. To increase humidity, consider using a humidifier, grouping plants, or placing the pot on a pebble tray filled with water. While the plant can acclimate to average household humidity, consistent higher levels promote lusher foliage and prevent browning leaf tips.
Fertilization
During its active growing season, typically spring and summer, Philodendron gloriosum ‘Dark Form’ benefits from regular fertilization. A balanced liquid fertilizer, diluted to half strength, is recommended monthly or every four to six weeks to provide necessary nutrients for robust growth.
As temperatures cool and growth naturally slows during fall and winter, reduce or stop fertilization. Over-fertilization can lead to nutrient burn, damaging the plant’s roots.
Propagating Philodendron Gloriosum Dark Form
Propagating Philodendron gloriosum ‘Dark Form’ is achieved by dividing its crawling rhizome. Select a healthy section that includes at least one node and preferably an aerial root. Use a clean, sharp cutting tool to make a precise cut. The cut end can be allowed to callous for a few hours before planting.
Cuttings can be rooted in various mediums, including water, sphagnum moss, or directly in a well-draining soil mix. When rooting in sphagnum moss, ensure it remains consistently moist but not waterlogged. Providing high humidity around the cutting, perhaps by covering it with a clear plastic bag, can significantly aid in successful rooting. Roots typically establish within two to four weeks. Once a healthy root system develops, the new plant can be transferred to a wider, shallow pot to accommodate its growth habit.
Addressing Common Issues
Yellowing leaves can indicate several issues. Overwatering is a frequent cause, as saturated soil deprives roots of oxygen. Yellowing can also signal nutrient deficiencies or, conversely, over-fertilization. Older leaves may naturally yellow and drop. Adjusting watering or fertilization can help.
Browning tips or edges often point to low humidity or inconsistent watering. Increasing ambient humidity (humidifiers, pebble trays) can alleviate this. Mineral buildup from tap water can also contribute to browning tips.
Pest infestations are another common concern, with spider mites, mealybugs, aphids, and thrips being typical culprits. Regular inspection aids early detection. Treatments include wiping leaves with a damp cloth, applying insecticidal soap, or using neem oil. Good air circulation can deter pests and fungal issues.
Slow growth or a general lack of vigor suggests suboptimal conditions. Insufficient light, improper watering practices, or inadequate nutrients are frequent reasons. Reviewing and adjusting the care routine (light, watering, nutrients) can encourage healthier development.