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Yellow/Green Beads in Potting Soil: Fertilizer, Not Eggs

The Mystery

Many potted plants have yellow/green "beads" in soil. Friend says they're eggs; crushing releases liquid. Owner doubts—they haven't hatched.

Answer: Controlled-Release Fertilizer Prills

Not eggs. These are polymer-coated fertilizer granules (Osmocote, Nutricote, etc.). The coating slowly releases nutrients via moisture/temperature. Liquid when crushed = concentrated fertilizer solution. Colors indicate formulation/longevity (3–4 months to 2 years).

What to Do

  • Leave them. They're feeding your plants.
  • Don't repot unless soil is broken down, compacted, or plant is root-bound.
  • If repotting: Mix old soil (with prills) into new mix—prills continue working.

How to Distinguish

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FeatureFertilizer PrillsInsect Eggs
Uniform size/shapeYesOften variable
ColorYellow, green, blue, grayWhite, cream, translucent
Crush testLiquid fertilizerHemolymph (clear/yellow)
LocationThroughout soilClusters on leaves/stems