PLACE IN INDIRECT LIGHT
Direct light can act like a magnifying glass and fry a terrarium’s contents, turning the lushest jungle-in-a-jar into a brittle crisp. Every fortnight or so take the lid off your terrarium and allow it to breathe for a few hours.
Overwatering is one of the most common mistakes; the worst thing you can do in a terrarium is to overwhelm plants with water. If looking a little sludgy, remove the terrarium’s lid for a couple of days to let it dry out a bit. Water droplets forming on the glass is a good sign. It means things are chugging along nicely. During the day, you want to see around 50 per cent condensation on the glass of your tropical terrariums, the rest of the glass should be clear.
LOW, BUT NOT NO, MAINTENANCE
Trim plants outgrowing the terrarium. Use aquarium plant scissors if you can’t get a regular pair through the opening.
When flowers pass on, you’ll want to remove their heads and any leaves that are brown or have fallen with chopsticks.
Mould has got to go! The slightest hint of the stuff and I’m in there with a magnifying glass. The first thing to try is removing the lid for a few days; if this doesn’t rectify the problem, remove the mould or the affected plant entirely (tweezers will come in handy here).