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“Philodendron” covers dozens of species kept as houseplants — heartleaf, brasil, birkin, pink princess, monstera-like climbers, large-leaved trees. This guide focuses on the most common variant, heartleaf philodendron (Philodendron hederaceum, sometimes sold as Cordatum or Sweetheart Plant). Most other heartleaf-shaped, vining Philodendrons share its care closely, but pet-toxicity must be verified per species at the ASPCA database — we cover only what’s verified for heartleaf below.
⚠ Pet warning — toxic to dogs, cats, and horses.
Per the ASPCA, heartleaf philodendron (Philodendron hederaceum) is toxic to dogs, cats, and horses. The toxic principle is insoluble calcium oxalates, with reported clinical signs of “oral irritation, pain and swelling of mouth, tongue and lips, excessive drooling, vomiting (not horses), difficulty swallowing” (ASPCA, “Heartleaf Philodendron”). Heartleaf philodendron trails downward from shelves and is exactly the kind of plant pets reach for — keep it well out of reach or choose a verified non-toxic species via the ASPCA database.
Light
NC State Extension: heartleaf philodendron “prefers medium light but will tolerate low light” and can survive “for long periods in extremely low light” (NC State Extension). This is why it shows up in windowless offices and back hallways — it’s one of the truly low-light-tolerant houseplants. Medium indirect light still keeps it healthier and fuller; direct sun scorches the leaves.
For the broader read on what “medium light” looks like in a real room, see houseplant light requirements.
Water
NC State: “keep soil slightly moist, and slow down on watering in the winter” (NC State Extension). The plant prefers moist (not wet) soil and root rot can occur in overly wet soil (NC State Extension).
Yellowing leaves on a heartleaf are almost always a watering signal — see overwatering vs underwatering, why are plant leaves turning yellow, and the root rot guide.
Soil
A standard houseplant mix with good drainage works fine — see the soil-mix guide. NC State notes the plant “appreciates misting” (NC State Extension), which is more about humidity than soil.
Temperature and humidity
NC State: prefers “average indoor air temperatures” and “medium relative humidity” though it “can tolerate dry air” (NC State Extension). Avoid cold drafts; otherwise it’s not fussy about typical home conditions.
If you’re seeing brown leaf tips, dry air is one of the usual suspects.
Fertilizing
A balanced houseplant feed during active growth (spring–summer); skip on stressed or freshly-repotted plants. See the fertilizing guide.
Repotting
Heartleaf philodendron grows steadily and benefits from being potted up before it becomes severely pot-bound. Signs and timing are in when and how to repot a houseplant.
Propagation
NC State lists stem cutting as the propagation method (NC State Extension). Heartleaf is one of the easiest houseplants to propagate in water — take a cutting with a couple of nodes, sit it in a glass of water, wait for roots, pot it up. Full method in how to propagate houseplants in water.
Mature size and habit
NC State describes the vines as “slender green stems with adventitious roots that can grow to 4 ft or more”, reaching up to “13 feet tall” in optimal conditions (NC State Extension). Indoors most people grow it as a trailer from a shelf or a climber up a moss pole. The longer the vines, the more critical the pet-warning above becomes — drooping vines are exactly what curious pets reach for.
Common problems
NC State flags aphids, spider mites, mealybugs, and scale as pests to monitor, with leaf spots and root rot as the main disease/condition risks (NC State Extension). Guides: mealybugs, spider mites, root rot. If something else looks wrong start with the troubleshooting hub.