Most likely cause

Overwatering is the top cause of a Rubber Plant dropping leaves. These plants store water in their thick, glossy leaves and need their soil to dry out partway between drinks. When the soil stays wet, the roots are starved of oxygen and rot, and the plant sheds leaves because the damaged roots can no longer feed them.

You can confirm it by the pattern. Overwatering causes lower leaves to yellow and drop first, the soil stays wet for many days, and the base of the stem may feel soft. If the pot lacks drainage or sits in a saucer of water, this is almost certainly the cause. Let the soil dry to the top inch or two and the dropping should slow as the roots recover.

Other causes

These rank below overwatering but often combine with stress.

  • Cold drafts. Sudden chills from a door, window, or AC vent trigger drop; leaves fall after a cold snap or seasonal change.
  • Relocation shock. A recent move or repot upsets the plant; it sheds leaves within days of the change as it adjusts to new conditions.
  • Too little light. In a dim corner the lower leaves yellow and drop; growth slows and the plant leans toward the nearest window.
  • Underwatering. Prolonged drought makes leaves curl, dry, and fall; the soil is bone dry and the pot feels very light.

How to fix it

  1. Check the soil. Feel the top inch or two. If it is wet, hold off watering until it dries; if bone dry, the plant is thirsty.
  2. Fix the drainage. Use a pot that drains freely and empty the saucer so the roots never sit in standing water.
  3. Find a stable spot. Keep the plant in one place with bright indirect light, away from cold drafts, heaters, and vents.
  4. Hold temperatures steady. Keep it above 60 degrees Fahrenheit and avoid sudden swings near doors and windows.
  5. Be patient after a move. After relocating or repotting, leave conditions steady and expect it to settle within 2 to 4 weeks.
  6. Water consistently. Water thoroughly only when the top inch or two is dry, then let it drain fully before returning the pot.
CauseTell-tale signFix
OverwateringYellowing lower leaves, wet soilLet top inch or two dry, improve drainage
Cold draftsDrop after a chill or vent exposureMove to a stable spot above 60F
Relocation shockDrop right after a move or repotKeep conditions steady, wait 2 to 4 weeks
Too little lightLower leaves drop, plant leansMove to bright indirect light
UnderwateringCurling, dry leaves, light potWater thoroughly, keep soil from drying fully