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Why Vermiculite Is Used in Some Nepenthes Soil Mixes Despite Alkalinity Concerns

A reader noted that "Secrets 1.2" recommends vermiculite in a premium Nepenthes mix, but vermiculite can raise pH.

Explanation

Nepenthes tolerate a wide pH range (acidic to basic).
Experiments show they grow fine in vermiculite mixes.
Key requirements: low nutrients, water retention, root aeration.
Future editions will simplify mixes to fewest ingredients.

Vermiculite is acceptable but not essential.

Carnivorous Plants: Potting Soil vs. Potting Mix: What’s the Difference?; Incorrect Soil Mix for Drosera capensis: Coconut Coir and Vermiculite; Darlingtonia californica Soil Mix: Fast Drainage Is Key; Vermiculite in Ultra-Highland Nepenthes Mix: Not Recommended; Storing Moist Peat Mix: Condensation Is Normal If Mix Is Dry; Emergency Nepenthes Repotting: Fertilized Orchid Bark, Charcoal Substitute, and Perlite Washing; Darlingtonia Soil Mixes: Aeration Is Key; Best Soil Mix for Cephalotus follicularis; Evaluating and Adjusting Nepenthes Soil Mixes for Your Climate; Vermiculite and Asbestos: Safe Alternatives for Carnivorous Plant Soil Mixes

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