Terrarium Lessons: Lighting, Soil, and Plant Selection

Long-Term Terrarium Success Requires Species Compatibility

A grower with a 4-tube shop light (11,800 lumens) plus southeast window sun listed many temperate and tropical species and asked about soil mixing and lighting adequacy.

Key Principles from an Experienced Terrarium Grower (Dan)

• Lighting: Right kind matters more than lumens. Dan uses three 4-ft double-tube fixtures with Philips "Plantes et Aquariums" tubes (F40), grouped over 10/15-gal tanks. Plants never see sun but have intense color.
• Soil: Only long-fiber sphagnum moss—no peat, sand, gravel, or mixes. They cause mold. Pack well after soaking.
• Environment: Humidity <80%, temp ≤84°F, night drop ≥15°F. Ventilation is essential.
• Plant Mix: Temperate plants (flytraps, Sarracenia) need dormancy—remove 5–6 months/year. Tropical/subtropical sundews and butterworts thrive in terrariums.
• Venus Flytraps in Terrariums: They tolerate high humidity (native SC coast is very humid). Dan has videos of thriving terrarium flytraps.

Follow-Up: Peat vs. Sphagnum Confusion

Peat is cheaper but breaks down. Long-fiber sphagnum (packed) is superior for terrariums. ZeroWater filter pitchers remove all minerals for cheap pure water.

Happy Growing,
Dan