How to look after your terrarium
Closed Bottle Terrariums
The moisture inside a closed terrarium is constantly recycled, so they need minimal care. A layer of condensation on the inside of the glass container is normal and part of the water cycle within the terrarium.
Your terrarium will rarely need watering, if at all however if you notice the soil turning a light brown, add a few drops to dampen it. If the terrarium is placed in an ideal position, the soil should remain damp without the need of additional water.
I recommend removing the cork lid once a month for 10-20 minutes to introduce new air and ensure a healthy environment for your plants.
Please ensure your new terrarium is placed in a cool, dry place such as a bedside table, bathroom ledge or anywhere in your home where there is a stable atmosphere because Fittonia will wilt when exposed to direct sunlight and close contact to central heating radiators.
The environment is one of the most important factors to consider before watering your air plant. If the plant is placed in a moist or humid room, they will need less watering as the plant takes its moisture from the air. However in drier rooms - perhaps those with heating - the plants will need more water and misting.
Your air plant
must be completely dry before misting as if they are over watered, the plant will develop root rot (wet rot). They can also suffer from dry rot if the plant doesn't receive adequate air flow and will appear brown at the tips.
In Summer months, I soak my air plants in a bowl of water for 20 minutes. Next, I gently shake them before placing the plants onto a towel. Once the plants are completely dry, I return them to the terrarium glass.
During the colder months, I mist my air plants once a week but if the heating is on more frequently in my house, I will increase the misting to 2 times a week.
Succulents and Cacti
As there is little drainage in open terrariums, succulents require minimal watering. It's best to water as close to the roots as possible to ensure the water is evenly distributed. In the warmer months, I water my succulents once every 2-3 weeks. Use no more than a few drops of water per plant. During winter, I lightly mist (spray) once a month and avoid watering the roots directly.
Terrariums with succulents need bright but indirect sunlight. It's best to place your terrariums in a bright room near a window.
Cacti need most of their watering during their growth period which is usually from April to September. I recommend watering each plant with a few drops every 2 weeks. However, the soil must be completely dry - if it is still even slightly damp, wait another week or so.
Most cacti go dormant from Autumn which means they stop growing. For most of my cacti, I avoid watering the plant directly and only lightly spray them once a month.
Cacti need bright and direct sunlight so place your terrarium as close to a window as possible.