Best Soil Mix for Drosera regia: Orchid Bark vs. Silica Sand

Optimizing Soil for the King Sundew

Drosera regia prefers well-drained soil over waterlogged conditions. The recommended mix is equal parts peat moss, perlite, and silica sand. Orchid fir bark is acceptable but tends to break down quickly, releasing nutrients that can harm this sensitive species. Growers report better growth after switching to silica sand.

Pot Choice Matters

Terracotta pots increase evaporation, keeping the root zone cooler—critical because D. regia is native to South Africa's coastal mountains and dislikes warm nights. A basement trial with night temperatures around 75°F caused total crop loss.

Selecting the Right Sand

Use coarse horticultural silica sand (e.g., Whitman Farms horticultural sand). Avoid fine, powdery sand that compacts over time, reducing aeration. Never use calcium-based "cactus sand" or "desert sand"—they are lethal to carnivorous plants.