The best replacement for vermiculite is perlite.

The best alternatives to vermiculite are rated as following:
★★★★★  perlite
★★★★  sand
★★★  peat moss
★★★  perlite insulation
★★  perlite gardening
★  expanded shale
★  rockwool
★  perlite square foot gardening
★  perlite mushrooms
★  asbestos
★  hatchrite
★  pumice
★  pearlite
  zeolite
  silica sand
  montmorillonite
  leca

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Google Trends

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