Philodendron hederaceum
Heartleaf philodendron likes soil that is lightly moist but never soggy. It dries out a little faster than you expect in a bright room and a lot slower in a dim one.
Your answer
Water when the soil reaches this point
How it shifts through the year
Check every week or so in warm months, and let the top inch dry before watering. In winter the interval often doubles.
Yellowing across many leaves usually points to wet soil. A few old leaves yellowing slowly is normal.
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Related guides
Estimates use rules of thumb. Always confirm with your finger: push it about an inch into the soil before you water.