Mystery White Clumps in Potting Soil: Eggs, Fungus, or Fertilizer?

Most Likely Culprits

• Slow-release fertilizer pellets (gray/tan, not pure white).
• Perlite or polystyrene beads—white, round, uniform.
• Fungal mycelium—can look like tiny white clumps, especially in non-sterile or overwatered soil.

Not Insect Eggs

Very few houseplant pests lay visible white egg clusters in soil. Mealybugs lay eggs in cottony sacs on stems, not loose in soil.

Don't Use Soap Drenches

Soap solutions kill spider mites on leaves but harm soil biology and keep soil wet—exactly what fungus gnats and root rot love. Dry soil is the cure for soil pests.

Best Action

Post a clear photo and tell me the soil source. If it's perlite/fertilizer, ignore it. If it's fungus, let the soil dry thoroughly between waterings.