Botanical Boys - Terrarium Care Guide

A closed terrarium is a small, self-sustaining world. Once it settles it asks very little of you — but the first couple of months are when a little attention makes the biggest difference.

• Light: bright, indirect light — never direct sun on the glass
• Temperature: a steady room temperature around 19–21°C
• Watering: rarely — observe before you water
• Condensation: a light mist is healthy; heavy fog means air it out

Lighting and temperature

Terrariums do best in a bright room with plenty of natural light, kept out of direct sun. Sun on the glass overheats the inside, causes heavy condensation and stresses the plants. Ordinary UK room temperature of about 19–21°C is ideal.

Condensation

Your terrarium recycles its own moisture. A little condensation on the glass is normal. If it is so foggy you cannot see the plants, lift the lid for a couple of hours, then close it again. Aim for a faint mist, never soaking wet. In a very dry home, air it less often.

Watering

There is no fixed schedule. The free-draining soil should never sit wet. If leaves wilt and moss turns pale, open the lid and feel the soil; if it is dry, give a small drink with a spray, pipette or syringe at the base of the plant, avoiding the leaves. Most closed terrariums need watering only a couple of times a year.

Springtails

Springtails are tiny (1–2 mm) soil-dwellers that eat mould and recycle fallen leaves. They need humidity, so they stay inside the terrarium and are harmless to plants, people and pets. Sprinkle a culture onto the soil or moss, close the lid, and let the colony establish over the following weeks.

Quick troubleshooting

• White mould on the soil: air the terrarium for a few hours a day, scoop out patches, and avoid overwatering. Springtails help keep mould in check.
• Fungus gnats: use organic gnat powder under the top soil layer and sticky traps if needed.
• White fluff on leaves: wipe early, prune damaged leaves, and leave the lid off for a couple of hours.
• Mushrooms: usually a sign of rich soil — leave them; they die back on their own.
• Plants too tall: prune just below a node to encourage bushier growth.
• Weepy, dry, pale plants: test the soil; if dry, add about 2–3 tablespoons of filtered water at the base.

Shop Botanical Boys terrarium kits, add terrarium figures, or revisit the Botanical Boys terrarium build guide if you are assembling a new kit.