Not enough light
A heartleaf that stretches with long gaps between shrinking leaves is almost always under-lit.
Diagnosis
Not enough light
What's happening
Heartleaf philodendron handles lower light than many houseplants, but in genuinely dim conditions it reaches toward the nearest window, spacing its leaves far apart on thin, weak vines — a habit called legginess. New leaves also come in smaller and paler because there isn't enough light to power full growth.
How to fix it
Move the plant to a brighter spot with plenty of bright, indirect light — a few feet back from an east or north window, or filtered south/west light. If your space is genuinely dim, a full-spectrum grow light makes a real difference and is often the only way to tighten up the growth. New leaves in better light will come in larger, greener, and closer together.
What fixes it
- A full-spectrum LED grow light — A full-spectrum grow light gives a heartleaf the steady light it needs to stop stretching and fill out.
If that doesn't fix it
This is general guidance based on common symptoms; individual plants vary.
Read the full Heartleaf Philodendron care guide →
Reviewed June 2026 · how we check this