Terrarium Masterclass: Create and Maintain Stunning Tabletop Gardens

Building Your Terrarium

Foundation Layers

• Drainage – Pebbles/LECA (1–2 inches).
• Filtration – Activated charcoal (thin layer) prevents odors, toxins.
• Substrate – Sterile, well-draining mix (peat, perlite, sand).

Plant Selection Rules

• Match size to container—slow growers, compact habits.
• Group by needs: moisture-lovers together, succulents separate.
• Proven combos: Alternanthera, Soleirolia, Breynia, Pilea glauca.

Maintenance Mastery

Watering Precision

• Open – Check weekly; mist until soil damp.
• Closed – Water only when no condensation forms.
• Fork soil gently to channel moisture to roots.
• Mildew = overwatered; ventilate immediately.

Air and Light

• Vent closed terrariums periodically.
• Diffused/medium light only—direct sun cooks plants.
• Rotate for even growth.

Nutrition and Grooming

• Fertilize rarely—substrate holds nutrients long-term.
• Prune to maintain scale; remove dead material promptly.
• Clean glass inside/out with damp paper towel.

Refresh Cycle

Annually: replace charcoal, refresh substrate, redesign planting. Terrariums are living art—evolve them joyfully.