The philodendron subhastatum stands out with its striking red stems and elongated, arrow-shaped foliage. This tropical plant is a favorite among houseplant enthusiasts for its dramatic appearance and relatively forgiving nature. If you’re looking to add a statement piece to your indoor jungle, this philodendron is a strong contender.
Its unique look, with leaves that can develop a beautiful velvety texture, makes it a rewarding plant to grow. This guide will walk you through everything you need to know to care for your philodendron subhastatum and help it thrive.
Philodendron Subhastatum
Native to the tropical regions of South America, specifically Colombia and Ecuador, the philodendron subhastatum is a climbing hemiepiphyte. In its natural habitat, it starts life on the forest floor and then climbs up trees towards the light. This growth habit is key to understanding its care needs in your home.
The most distinctive features are its elongated, arrowhead-shaped leaves and the vibrant red or burgundy stems and petioles. The leaves are a deep green with a subtle sheen and can develop a slightly rough texture as they mature. A well-cared-for plant can produce leaves over a foot long, creating a lush, tropical effect.
Light Requirements For Optimal Growth
Getting the light right is crucial for a healthy philodendron subhastatum. It mimics the dappled sunlight of its native understory. Too much direct sun will scorch its leaves, while too little will lead to leggy growth and loss of color.
Place your plant in a spot with bright, indirect light. An east-facing window is often ideal, providing gentle morning sun. A north-facing window can work if it’s bright enough. If you only have a south or west window, use a sheer curtain to filter the intense afternoon rays.
Signs of incorrect lighting include:
- Yellowing leaves: Often a sign of too much direct sunlight.
- Small, pale leaves: Indicates the plant is not receiving enough light.
- Stretched stems: The plant is “reaching” for a light source, resulting in large gaps between leaves.
Watering Your Plant Correctly
Watering is where many plant owners face challenges. The philodendron subhastatum prefers its soil to partially dry out between waterings. It dislikes both soggy soil and being bone dry for extended periods.
The best method is the “finger test.” Insert your finger about an inch or two into the soil. If it feels dry, it’s time to water. Water thoroughly until you see it drain freely from the bottom of the pot. Always empty the saucer or cache pot after 15-20 minutes to prevent root rot.
Factors that affect watering frequency:
- Season: Water more frequently in spring and summer (active growth) and reduce in fall and winter.
- Light and temperature: Higher light and warmer temps mean more frequent watering.
- Pot size and material: Plants in smaller pots or terracotta pots dry out faster than those in large plastic pots.
Signs of Overwatering and Underwatering
Learn to read your plant’s signals. Overwatering is a more common and serious issue than underwatering for philodendrons.
- Overwatering: Yellowing lower leaves, consistently wet soil, a musty smell, and black, mushy stems.
- Underwatering: Drooping leaves, dry and crispy leaf edges, and soil pulling away from the pot’s edges.
Soil And Potting Mix Formulation
A well-draining, airy potting mix is non-negotiable for philodendron subhastatum. Its roots need oxygen and can quickly rot in dense, water-retentive soil. A standard houseplant potting mix is a good base but should be amended.
You can create an excellent mix by combining:
- Two parts high-quality potting soil.
- One part perlite or pumice for aeration.
- One part orchid bark or coconut coir for chunkiness and drainage.
This combination ensures moisture is held for the roots but excess water drains away quickly. Repot your philodendron subhastatum every 1-2 years, or when you see roots circling the bottom of the pot. Choose a pot only 1-2 inches larger in diameter to avoid excess wet soil.
Ideal Temperature And Humidity Levels
As a tropical plant, philodendron subhastatum thrives in warm, humid conditions. It is not cold-hardy and should be kept away from drafts, air conditioners, and heating vents.
Temperature: Aim for a range between 65°F and 80°F (18°C – 27°C). Avoid letting temperatures drop below 55°F (13°C), as this can cause cold damage and stunt growth.
Humidity: This plant prefers humidity levels above 60%. Average home humidity (around 30-50%) is often acceptable, but higher humidity promotes larger, healthier leaves and faster growth.
To increase humidity:
- Use a humidifier placed near the plant.
- Group it with other humidity-loving plants.
- Place the pot on a pebble tray filled with water (ensure the pot sits above the water line).
- Misting can provide a temporary boost, but is not a long-term solution and can promote fungal issues if overdone.
Fertilizing For Healthy Foliage
Regular feeding during the growing season supports the vigorous growth of your philodendron subhastatum. A balanced, water-soluble fertilizer is a good choice.
From early spring to early fall, fertilize once a month at half the recommended strength on the bottle. This “weakly, weekly” approach prevents fertilizer salt buildup in the soil, which can burn the roots. You can use a balanced formula (like a 10-10-10) or one slightly higher in nitrogen to encourage leafy growth.
In the late fall and winter, reduce or stop fertilizing altogether as the plant’s growth naturally slows. Always water the soil lightly before applying fertilizer to damp roots, which helps prevent shock.
Pruning And Maintenance Tips
Pruning your philodendron subhastatum helps maintain its shape, encourages bushier growth, and removes any unhealthy foliage. Use clean, sharp scissors or pruning shears to make clean cuts.
You can prune:
- Any yellow, brown, or damaged leaves at the base of their stem.
- Long, leggy vines to encourage branching from lower nodes.
- To control the overall size and shape of the plant.
Regular maintenance also includes wiping the leaves with a damp cloth every few weeks. This removes dust, allows the leaves to breathe and absorb more light, and helps you check for pests. Supporting its climbing habit with a moss pole or trellis will lead to larger, more mature leaves, as it mimics its natural growth pattern.
Propagation Methods Explained
Propagating philodendron subhastatum is straightforward and allows you to create new plants. The most reliable method is stem cuttings. The best time to propagate is during the active growing season in spring or summer.
Follow these steps for sucess:
- Identify a healthy stem with at least one node (the bump where leaves and roots emerge) and 1-2 leaves.
- Using sterile shears, cut just below a node.
- You can root the cutting in water or directly in soil.
Water Propagation
Place the cutting in a jar of room-temperature water, ensuring the node is submerged but the leaf is not. Change the water every few days to keep it fresh. Roots should begin to appear in 2-4 weeks. Once the roots are an inch or two long, you can pot the cutting in soil.
Soil Propagation
Dip the cut end in rooting hormone (optional) and plant it in a small pot with moist, well-draining potting mix. Cover the pot with a clear plastic bag to create a humid environment. Place it in bright, indirect light and keep the soil lightly moist. New growth indicates the cutting has rooted.
Common Pests And Diseases
Philodendron subhastatum is relatively resistant, but like all houseplants, it can occasionally encounter problems. Early detection is key to easy management.
Common Pests:
- Spider Mites: Tiny spiders that create fine webbing, usually under leaves. They cause stippling (tiny yellow dots) on foliage. Treat with insecticidal soap or neem oil, and increase humidity.
- Mealybugs: Small, white, cottony insects that cluster in leaf axils and on stems. Remove with a cotton swab dipped in rubbing alcohol or apply horticultural oil.
- Scale: Brown or tan bumps on stems and leaves that can be scraped off. Treat similarly to mealybugs.
Common Diseases:
- Root Rot: Caused by overwatering and poor drainage. Signs include wilting, yellow leaves, and black, mushy roots. You must remove the plant from its pot, cut away all rotten roots, and repot in fresh, dry soil.
- Leaf Spot Diseases: Fungal or bacterial issues causing brown or black spots with yellow halos on leaves. Remove affected leaves, improve air circulation, and avoid wetting the foliage when watering.
Troubleshooting Leaf Problems
Leaves are the best indicator of your plant’s health. Here’s how to diagnose common issues with philodendron subhastatum leaves.
- Yellow Leaves: Often a sign of overwatering or poor drainage. Can also indicate nutrient deficiency or natural aging of older leaves.
- Brown, Crispy Leaf Edges: Usually caused by low humidity, underwatering, or a buildup of salts from tap water or fertilizer.
- Drooping Leaves: Typically caused by underwatering or, conversely, root rot from overwatering. Check the soil moisture to determine the cause.
- Small Leaves: Insufficient light, lack of nutrients, or the plant needs a support to climb on to produce larger, mature leaves.
- Loss of Red Color in Stems: Often due to too little light. The vibrant red pigmentation develops best with adequate bright, indirect light.
Frequently Asked Questions
Is Philodendron subhastatum rare?
While once considered quite rare, philodendron subhastatum has become more available in recent years through specialty nurseries and online plant shops. It is not as common as some other philodendrons, but it is increasingly popular among collectors.
How fast does Philodendron subhastatum grow?
With optimal care—good light, warmth, humidity, and regular feeding—this plant has a moderate to fast growth rate during the spring and summer. You can expect several new leaves per growing season, especially if it is provided with a moss pole to climb.
Is Philodendron subhastatum toxic to pets?
Yes, like all philodendrons, the subhastatum contains calcium oxalate crystals which are toxic to cats, dogs, and humans if ingested. It can cause oral irritation, drooling, and difficulty swallowing. Keep this plant out of reach of curious pets and children.
Why are the leaves on my Philodendron subhastatum curling?
Leaf curl is usually a sign of underwatering or low humidity. Check the soil moisture first. If the soil is dry, give it a thorough drink. If humidity is consistently low, try implementing some of the humidity-boosting methods mentioned earlier.
Can Philodendron subhastatum live in water forever?
While it can be propagated and sustained in water for a long time, it is not ideal for the plant’s long-term health. It will grow slower and may eventually become deficient in nutrients that are typically obtained from soil. For a robust plant, it’s best to transfer a water-propagated cutting to a well-draining potting mix.