How to Grow and Care for Philo Pastazanum

Philodendron pastazanum is a striking plant known for its large, heart-shaped leaves. Originating from the Pastaza province in Ecuador, this plant features glossy, vibrant green foliage that makes a statement in any collection. The deep green leaves have veins that become more pronounced as the plant matures, adding to its lush appearance.

Distinguishing Pastazanum from Look-Alikes

Identifying a true Philodendron pastazanum can be challenging due to its similarity to Philodendron mcdowell and Philodendron gloriosum. The primary differentiator is the leaf texture. P. pastazanum has distinctly glossy leaves that reflect light, while both P. gloriosum and P. mcdowell have a velvety or matte leaf surface.

Another feature is the petiole, the stalk connecting the leaf to the stem. The pastazanum has a D-shaped petiole, flat on top and rounded on the bottom. The mcdowell hybrid often shows intermediate traits, such as new leaves with a pinkish hue on their undersides and reddish cataphylls. In contrast, pastazanum foliage emerges light green with green cataphylls.

Subtle differences in leaf shape can also be observed. The leaves of P. pastazanum are flatter, while P. mcdowell can have a more “pillowy” or quilted texture between the veins. These distinctions become more apparent when comparing mature specimens.

Ideal Growing Conditions

Philodendron pastazanum requires conditions that mimic its native tropical environment. Proper care involving light, soil, water, and nutrients ensures the development of its signature large, glossy leaves.

Light

This philodendron prospers in bright, indirect sunlight, such as a few feet from a west or north-facing window. While it can tolerate lower light, brighter conditions encourage more robust growth and larger leaves. Direct sunlight should be avoided as it can scorch the foliage.

Soil

The soil for P. pastazanum must be well-draining to prevent rhizome rot. A chunky aroid mix is recommended, containing components like orchid bark, perlite, and coco coir. This composition provides excellent aeration and prevents the soil from becoming waterlogged.

Watering

Water the plant thoroughly, allowing excess to drain completely. Before watering again, let the top two to three inches of soil dry out. This method ensures the roots receive moisture without sitting in soggy soil, which can cause the surface-dwelling rhizome to rot.

Temperature and Humidity

This plant appreciates warm and humid conditions, thriving in temperatures between 65 and 85°F (18 to 29°C). It is sensitive to cold and should be protected from temperatures below 55°F. While it adapts to average household humidity, it will flourish with levels of 50% or higher.

Fertilizer

During the spring and summer growing seasons, regular feeding supports the plant’s development. A balanced liquid fertilizer can be applied once a month, or a diluted solution can be used with every watering. Reduce or stop fertilization during the fall and winter when growth slows.

Potting and Support

The crawling nature of Philodendron pastazanum requires a specific approach to potting. Unlike climbing aroids, this plant’s rhizome grows horizontally across the soil surface. This means it needs horizontal space rather than vertical support.

A long, rectangular planter is the ideal container, providing the rhizome with ample room to grow. As it extends, it sends down roots into the substrate. Repotting is necessary when the rhizome has reached the end of its container.

The rhizome should not be buried in the soil, as this can lead to rot. Instead, it should be placed on top of the airy potting mix. This allows it to have contact with the medium while remaining exposed to the air.

Propagation Methods

Propagating Philodendron pastazanum is done by taking a cutting from its rhizome. The process is straightforward due to the plant’s habit of sending out roots from nodes along the stem. The best time to propagate is during the spring and summer growing season.

Use a clean, sharp blade to cut a section of the rhizome, ensuring each cutting has at least one node. A cutting with a leaf is preferable, as it can provide energy for new root development. Allow the cut end to dry and form a callus for a few hours to help prevent rot.

Place the calloused cutting in a rooting medium like sphagnum moss or perlite, keeping it moist but not saturated. A warm, humid environment, such as a propagation box, can accelerate rooting. Once a healthy root system develops, the new plant can be transplanted into a suitable potting mix.

Common Issues and Solutions

Even with attentive care, you may encounter some common issues with Philodendron pastazanum. Identifying these problems early can help you address them before they cause significant damage.

Yellowing leaves are a frequent sign of overwatering. If you notice this, check the soil moisture and adjust your watering schedule. Allow the top layer of soil to dry out more thoroughly between waterings to protect the rhizome.

Pests such as spider mites and thrips can be an issue. Regularly inspect the leaves, including their undersides. If an infestation is found, wipe the leaves with a damp cloth and treat the plant with insecticidal soap or neem oil. Maintaining higher humidity can also help deter spider mites.

If new leaves are smaller than previous ones, the plant may need more light or nutrients. Move the plant to a location with brighter, indirect light. A consistent fertilizing schedule during the growing season will also provide the nutrients needed for large foliage.