How to Grow and Care for Philodendron Pastazanum Silver

The Philodendron pastazanum ‘Silver’ is a visually impressive plant known for its large, heart-shaped leaves with a corrugated texture and a notable silvery sheen. As a terrestrial, or “crawling,” philodendron, it grows horizontally across the ground, a trait that influences its care and display. Its unique appearance has made it a sought-after variety for indoor gardeners.

Silver Pastazanum’s Distinctive Traits

The “silver” quality of this Philodendron is a distinct, metallic sheen that covers the leaf surface, giving it a cool-toned shimmer under bright, indirect light. This is different from a pattern of splotches. In contrast, the standard Philodendron pastazanum has a deeper green, more uniform coloration. The ‘Silver’ variety’s leaves also have a slightly quilted texture and a matte finish when they first unfurl.

This plant is often compared to other crawling philodendrons. Philodendron mamei displays more defined, splashy silver patches rather than an all-over sheen. Philodendron plowmanii is distinguished by its uniquely ruffled petioles (the leaf stalks), a feature the ‘Silver’ pastazanum lacks.

Unlike climbing aroids, this plant’s main stem is a thick rhizome that grows horizontally across the soil surface. As the rhizome extends, it sends down roots to anchor itself and absorb nutrients. This outward expansion requires specific potting considerations to accommodate its lateral spread.

Complete Care and Maintenance

Light

Bright, indirect light is needed to maintain the silvery sheen and encourage growth. An ideal location provides ample natural light but is shielded from direct sun, which can scorch the leaves. While insufficient light may not harm the plant, it will likely fail to develop its vibrant coloration. An east-facing window or a spot several feet from a south or west-facing window is suitable.

Soil

A chunky, well-draining aroid mix is recommended for this plant. Such a mix includes components like coco coir, orchid bark, and perlite to create an airy and fast-draining substrate. This structure prevents water from sitting around the rhizome and roots, which is a primary cause of rot.

Watering

Water the plant thoroughly only when the top two to three inches of soil feel dry. This approach ensures the roots receive adequate moisture without becoming waterlogged. Overwatering is a significant risk for this plant, as a constantly wet rhizome is highly susceptible to rot, which can quickly lead to the plant’s decline.

Temperature and Humidity

This philodendron prefers warm and humid conditions, similar to its native tropical rainforests. Ideal temperatures are between 65°F and 85°F (18°C to 29°C). While it can adapt to average household humidity, it grows best in levels above 50-60%. Keep the plant away from cold drafts or direct blasts from heaters and air conditioners to prevent stress.

Fertilizer

During the spring and summer growing season, regular feeding supports the development of its large leaves. You can apply a balanced liquid fertilizer diluted to a weak strength weekly. Alternatively, feed every four to six weeks with a balanced fertilizer at its recommended strength. Reduce or stop fertilizing in fall and winter when growth slows.

Potting and Repotting

A rectangular planter or a long, trough-style container is ideal for this plant’s crawling nature, providing the rhizome with space to grow horizontally. This prevents the rhizome from quickly growing over the edge of a traditional round pot. Repot every one to two years, or when the rhizome fills the container. When repotting, place the rhizome on top of the soil, never burying it.

Propagation and Problem Solving

Propagation is done through rhizome cuttings. Cut a section of the main rhizome, ensuring the piece has at least one node (the point from which new growth emerges) and preferably a leaf. These cuttings can be rooted in a medium like sphagnum moss, which retains moisture and encourages new growth.

Yellowing leaf edges often point to overwatering or poor soil drainage. If this occurs, check the soil moisture and allow it to dry out more between waterings. Browning or crispy leaf edges can indicate that the ambient humidity is too low.

Common pests include spider mites and mealybugs. Regularly wiping the large leaves with a damp cloth helps keep them clean and deter pests. If an infestation is found, treat the plant with neem oil or an insecticidal soap to manage the issue.