Short answer
Fine webbing and speckled, stippled leaves on a Spider Plant are almost certainly a sign of a spider mite infestation. To fix this, isolate the plant immediately and treat it with regular applications of insecticidal soap or neem oil while increasing ambient humidity.
Spider plants (Chlorophytum comosum) are generally hardy, but their foliage is highly susceptible to spider mites, especially during the dry winter months. The symptoms manifest as tiny, yellowish-white dots on the leaf surface known as stippling, accompanied by faint, dusty webbing between the arching leaves. While treatable, these pests reproduce rapidly and require prompt intervention to prevent damage to the plant's structural integrity.
These tiny arachnids thrive in the warm, dry indoor air typical of many homes. They pierce the leaf tissue to feed on plant sap, which causes the characteristic speckled appearance and fine webbing.
Check: Check the underside of the leaves with a magnifying glass for tiny moving specks or place a white sheet of paper under the foliage and tap the leaves to see if mites fall onto the paper.
Fix: Thoroughly rinse the plant in the shower to remove physical webs, then apply neem oil or insecticidal soap every five to seven days for three weeks to break the mite life cycle.
While not a direct cause of webbing, spider plants prefer moderate humidity; extremely dry air stresses the plant and creates the perfect environment for mite populations to explode. Chronic low humidity weakens the plant's defenses against pests.
Check: Check if other plants in the room are showing crispy brown tips or if you live in a climate with very low indoor humidity levels during heating season.
Fix: Place the spider plant on a pebble tray filled with water or group it with other plants to naturally elevate the humidity in its immediate vicinity.
Sometimes, thick layers of household dust can mimic the look of fine webbing, especially if the leaf surface looks dull or 'stippled' due to neglect. However, this will not produce living, silk-like webs.
Gently wipe a leaf with a damp cloth; if the 'webbing' wipes away cleanly and the leaf beneath appears healthy with no stippling, it was likely just dust.
When to worry
You should be worried when the webbing spreads to the base of the plant or if you notice the leaves beginning to yellow or curl significantly, indicating the infestation is heavy and beginning to starve the plant of nutrients.
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Diagnose my Spider PlantYou can prune heavily damaged leaves to improve the plant's appearance, but this will not remove the mites hidden elsewhere. You must still treat the entire plant to ensure the population is eliminated.
Unfortunately, the stippling caused by spider mites is permanent damage to the leaf tissue. As you treat the infestation and the plant grows new, healthy leaves, you can gradually prune away the damaged ones.
Keep your spider plant away from heat vents, maintain consistent soil moisture, and occasionally wipe down the leaves or mist them. Regularly inspecting your plants every time you water is the best way to catch new arrivals before they form colonies.
Consistent with guidance from: University of Illinois Extension Plant Clinic, Royal Horticultural Society.
Fix: Regularly wipe the long, strap-like leaves of your Chlorophytum comosum with a damp, soft cloth to keep the pores clear and the plant aesthetically healthy.