A spider plant that wilts or yellows while its pot stays wet is worth unpotting. Spider plants are tough. NC State Extension says Chlorophytum comosum tolerates drought and dry soil. What they handle badly is mix that stays wet. Clemson Extension says root rot usually results from a soil mix that does not drain quickly or from excessive watering.

The good news is that a spider plant gives you more than one way back. You can trim and repot the parent, or root a plantlet if the crown is gone.

Is it root rot or something else?

Spider plants show stress in ways that look alarming but are not rot. Sort those out first.

What you seeWhat it points toSource
Brown leaf tips on a firm plant, mix not soggyToo much fertilizer, salty water, low humidity or very dry mixClemson HGIC 1513
Brown tips plus a tap-water habitChlorine and fluoride in tap waterNC State
Thick, fleshy roots pushing at the potNormal tuberous roots; time to divide or repotClemson HGIC 1513
Yellowing, wilting, and the mix stays wetOverwatering, possible root rotClemson HGIC 2251, Virginia SPES-804
Wilting even though the mix is moistRoot rotUniversity of Maryland
Soft, dark base where leaves meet the soilCrown or stem rotClemson HGIC 2251

If your plant only has brown tips, see our spider plant brown tips guide. Brown tips alone do not mean rot.

Signs above the soil

University of Maryland Extension lists the symptoms of root and crown rots: yellowing, browning and dieback of leaves, poor growth and wilting. The crown or roots may brown or blacken. It notes that plants with Pythium or Phytophthora root rot often wilt even when the mix holds enough water. That is the clue that the roots, not the watering, have failed.

Virginia Cooperative Extension adds the general signs of overwatering:

  • Yellowing on both new and old leaves
  • Soft, mushy leaves or stems
  • Rotten-smelling potting mix
  • Fungus gnats around the pot
  • Stunted growth

Signs at the roots

Slide the plant out of its pot to be sure. Support the base of the rosette and tip the pot. You are comparing two kinds of root.

Healthy roots. Clemson says spider plants form thick, fleshy tuberous roots. Firm, plump roots are normal, even if they fill the pot.

Rotted roots. Maryland Extension describes Pythium root rot as brown to black roots that are soft or mushy. The outer layer pulls away easily, leaving a fine thread of core. When you lift the plant, much of the root system may stay behind in the pot. Clemson’s disorders factsheet describes infected roots as brown to black and possibly soft, and says stems may be girdled near soil level by a ring of brown or black tissue.

Why spider plants rot

Clemson and Virginia point to the same conditions:

  • Slow-draining mix. Clemson names it as a usual cause.
  • Watering too often. Virginia says overwatering is about how often you water, not how much. Wet mix fills the pore spaces, oxygen falls, and roots stop growing and die.
  • Standing water. Clemson’s disorders factsheet warns against leaving houseplants in a saucer full of water. Check decorative cover pots too.
  • Winter watering. NC State says to reduce watering in winter.
  • A pot that is too big. Virginia warns that an oversized container leaves roots in a zone that stays too wet.

What to do

  1. Unpot and wash off loose mix so you can see every root.
  2. Judge how much is left. Clemson says that if only a few roots are infected, cut those out and repot. If most roots are dark, soft and dead, it says it is better to discard the plant.
  3. Cut out rotted roots with clean, sharp scissors. Maryland Extension’s repotting steps say to remove any dead, brown roots. Keep firm tuberous roots.
  4. Use fresh, sterile mix. Clemson recommends sterilized soil and pots. Maryland suggests a soilless mix of peat moss, vermiculite and perlite, and warns that dense products sold as “potting soil” can lack aeration.
  5. Clean or replace the pot. Clemson says to scrub reused pots and rinse them in one part bleach to nine parts water.
  6. Choose a pot that fits the roots you kept, with drainage holes.
  7. Water once, then wait. Maryland says to water thoroughly after repotting, then hold off until the top of the soil dries.
  8. Do not feed yet. Clemson says to wait four to six months before feeding newly potted spider plants.
  9. Keep it apart from other plants until it settles. Maryland advises separating infected plants from healthy ones.

Clemson notes that fungicides exist but will probably cost most indoor gardeners more than a new plant.

Save a plantlet if the crown is soft

If the centre of the plant has turned soft and dark, a plantlet may be the better bet. Maryland advises taking cuttings only from healthy tissue. Choose a plantlet with firm leaves and no browning at its base.

Clemson says plantlets root readily when they touch soil. You can start them at any time of year, detach them once roots have formed and pot them straight into moist mix. Our spider plant propagation guide walks through it. Root it in fresh mix and a clean pot, not in the old mix.

Preventing the next round

  • Let the mix dry slightly. Clemson says spider plants should dry out briefly between waterings, and suggests checking the soil daily.
  • Check, then water. Virginia suggests pushing a finger 2.5–7.5 cm (1–3 in) into the mix, depending on pot size, before watering.
  • Water thoroughly, then empty the saucer. Virginia says to let the pot drain until it stops dripping.
  • Use a well-drained mix. Clemson recommends general-purpose potting soil with good drainage.
  • Repot before the roots crack the pot. Clemson says to divide and repot before the tuberous roots expand that far.
  • Water less in winter. NC State and Virginia both advise this. Virginia says to watch plants closely in autumn and winter to avoid root rot.
  • Keep it warm enough. Clemson gives 18–24 °C (65–75 °F) by day and 10–13 °C (50–55 °F) at night. NC State says to keep it above 7 °C (45 °F).

The ASPCA lists spider plant as non-toxic to dogs and cats. For a wider look at rot on other plants, see our houseplant root rot guide. For everyday care, see the spider plant care guide.

References