Why Watering Is Different in Closed Terrariums

Closed terrariums are self-contained ecosystems. Once set up correctly, they create their own humidity cycle: water evaporates, condenses on the glass, and returns to the soil. This means they rarely need watering — and overwatering is actually more harmful than underwatering.

How to Tell If It Needs Water

Check for these visual clues:

• Light fogging or occasional condensation = perfect balance ✅
• Heavy condensation dripping down the glass = too wet 💧
• Dry soil, crispy moss, or wilted plants = too dry 🌿

If your terrarium looks balanced, don’t touch it. Only water if you see signs of dryness.

How to Add Water Safely

If your terrarium does need watering:

• Use a mister or a syringe for precision.
• Add just a few sprays or drops at a time.
• Mist around the sphagnum moss or soil, not directly on plant leaves.
• Wait 24 hours and reassess before adding more.

Tip: Always use dechlorinated water (like rainwater, distilled water, or tap water left to sit overnight).

What If It’s Too Wet?

If condensation is heavy or you see mould forming:

• Open the lid for a few hours or a day to release excess humidity.
• Use a paper towel or sponge to dab away pooled water if needed.
• Keep the terrarium somewhere bright but not hot to help balance conditions.

Frequency of Watering

With a properly sealed closed terrarium:

• Watering is usually needed every few months, or not at all.
• Seasonal changes (like heaters or aircon) may affect moisture, so check monthly.

🔗 More care guides: Care Instructions

💡 New to terrariums? Read our Beginner’s Guide to Terrariums

✉️ Need help? Contact Us and we’ll be happy to provide specific advice!