How to look after a terrarium

How to look after a terrarium

Terrariums are fairly low maintenance and the plants growing inside them will largely look after themselves. Closed jars will create their own ecosystem and even become self-watering. Where you keep your terrarium is crucial for the plants’ survival, so it's worth paying attention to the light requirements of each plant before planting them together. Humidity can also be an issue, with some plants requiring dry environments and others needing constant humidity.

In this short video guide, the experts at Grow Tropicals share their tips for caring for terrariums, including what compost to use and what type of container to use.

More on planting terrariums:

• Choosing a terrarium
• 11 terrarium ideas
• Create a desert plant terrarium

Browse our list of terrarium care tips, below.

Where to position a terrarium

Closed terrariums

Place these away from windows or in a spot with bright, indirect light as most problems come from too much light or heat. Sit it 1m from a north-facing window, 3m from an east or west-facing window and 5m from a south-facing one.

Open terrariums

Place on a windowsill or table in full or partial sun. If succulents become tall and straggly, they will need more light, so move them to a brighter spot. If they get enough light, they may even produce flowers.

How to water a terrarium

Open terrariums

Water succulents and cacti weekly from March to October with a dessertspoon of water per plant. During winter water only every six weeks.

Closed terrariums

You should be able to see condensation up to a third of the height of the jar. If you can, you don't need to do anything - the terrarium will maintain an even level of humidity and become 'self watering'. If the condensation line is higher than a third of the way of the jar, remove excess water by opening up and carefully wiping the inside using kitchen roll wrapped around long tweezers. If there's very little condensation, add a tablespoon of water.

How to prune terrarium plants

Trim back any plants that touch the sides of the terrarium using aquatic scissors and tweezers. Cut straggly stems down to a healthy leaf joint to encourage fuller growth and remove any mouldy leaves or stems as soon as you see them.

How to revive sick terrarium plants

If plants turn brown and look very moist in a closed terrarium, they're probably getting too much light. Open up and wipe off any excess water with kitchen roll. Trim off and remove dead leaves or stems. Close up the terrarium and move to a shadier spot. If moss looks faded, add a spoonful of water onto it. If you see any mould, wipe it off and leave the lid open for five minutes to allow in airflow.

With thanks to jarandfern for help with this feature.