Ficus elastica
Rubber plants have thick, waxy leaves and sturdy stems. They drop their lower leaves when overwatered, which is the signal most owners misread as thirst.
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Water when the soil reaches this point
How it shifts through the year
Overwatering is a leading cause, along with sudden changes in light or temperature. Check the soil and the roots before changing anything else.
Check every week or two and water when the top inch or two is dry. The interval grows in winter.
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Estimates use rules of thumb. Always confirm with your finger: push it about an inch into the soil before you water.