Vermiculite in Darlingtonia Soil: Acceptable but Perlite Is Better Long‑Term

Vermiculite Works for Cobra Lilies—With Caveats

Darlingtonia tolerates higher mineral content than Sarracenia, so vermiculite’s slight mineral contribution is usually fine. It also holds water well.

Why Perlite Is Preferred

• Vermiculite breaks down into fines over time, reducing aeration.
• Perlite is inert, stable, and maintains drainage indefinitely.
• Top‑water daily in hot weather regardless of medium.

If you already have vermiculite, it’s okay to use; just plan to repot into perlite‑based mix next season.