Most likely cause

Relocation shock is the top cause of a Croton dropping leaves. Crotons are famously fussy about change, and moving one to a new room, bringing it home from a shop, or repotting it alters its light, warmth, and humidity all at once, which the plant reacts to by shedding foliage.

You can confirm it by the timing. If the drop began within days of a move, repot, or change of season, and the leaves that fall still look reasonably healthy rather than crispy or stippled, shock is almost certainly the driver. The fix is patience: pick one stable, bright spot away from drafts and leave the plant there. Most Crotons re-leaf within 2 to 4 weeks once conditions hold steady.

Other causes

These rank below shock but often overlap with it.

  • Cold drafts and temperature swings. Leaves drop near a door, drafty window, or AC vent; Crotons resent temperatures below 60F (15C) and sudden drops in particular.
  • Underwatering or inconsistent watering. The soil is dry and the leaves wilt before they fall; watering that swings between bone-dry and soggy is a frequent trigger.
  • Low humidity. Dry indoor air turns leaf edges crispy before they drop; Crotons prefer 40 to 60 percent humidity or higher.
  • Spider mites. Sap-suckers stress the plant into dropping leaves; look for fine webbing and pale stippling on the undersides of leaves.

How to fix it

  1. Pick one stable spot. Choose a warm, bright location with indirect light and stop moving the plant; constant relocation only restarts the shock.
  2. Keep it warm. Hold temperatures above 60F (15C) and move the plant away from doors, drafty windows, and AC or heating vents.
  3. Water consistently. Water when the top inch of soil is dry, then water thoroughly until it drains, using filtered or room-temperature water.
  4. Raise the humidity. Aim for 40 to 60 percent with a humidifier or a nearby pebble tray, especially in dry or heated rooms.
  5. Check for pests. Inspect leaf undersides for fine webbing and stippling; if you find mites, rinse the plant and treat with insecticidal soap.
  6. Feed lightly. During active growth, feed at quarter strength every few weeks to support new leaves once the plant has settled.
  7. Wait it out. Give a recovering Croton 2 to 4 weeks of stable conditions before expecting new growth, and leave firm bare stems in place.
CauseTell-tale signFix
Relocation shockDrop after a recent move or repot, leaves still healthySettle in one stable spot, wait 2 to 4 weeks
Cold draftsDrop near a door, window, or ventKeep above 60F, away from draft sources
UnderwateringWilting first, dry soilWater when top inch dries, stay consistent
Low humidityCrispy edges before dropRaise humidity to 40 to 60 percent
Spider mitesStippling and fine webbing underneathRinse and treat with insecticidal soap