Now that you’re the proud owner of a beautiful new fern or succulent terrarium, we’re sure you want to keep it that way. The good news is, terrariums are easy to care for. Here’s everything you need to know to keep your terrarium looking great.
Where to position your terrarium
Because your plants are surrounded by glass, do not place them in direct light. The temperature can quickly rise inside your terrarium, essentially roasting your plants.
Your terrarium’s new home should be a spot where it can enjoy plenty of indirect light, like a window that enjoys indirect light for most of the day. Most ferns grow in moist areas under forest canopy, so a fern terrarium will also thrive in low light, but keep it away from indoor heaters and air-conditioners.
As a general rule of thumb, your plant will thrive in a spot where the conditions are similar to that of it's natural environment.
Succulents have adapted to withstand the harshest of conditions, storing water in their thick, fleshy leaves, stems, roots or tubers. So a succulent terrarium will have low water needs. Lightly mist weekly or water fortnightly with just a few drops of water near the roots. It’s important to let the soil dry between watering and under-watering is always better than over-watering, which can lead to rot. Fern terrariums on the other hand need more regular watering or misting, especially in summer or in spots with low humidity.
For both succulent and fern terrariums, fertiliser and nutrients should only be given in spring and summer, every two to four weeks at only about a quarter of the recommended dosage. A general liquid or slow-release fertiliser is best.
Keep your plants looking good by removing any leggy, tatty, brown or damaged foliage. Also, cut back any parts of the plant that are touching the glass. If a plant looks diseased or is on its last legs, remove it carefully, trying not to disturb the roots of other plants and replace with a plant that's similar in size and light needs.
Cleaning your terrarium
If the glass of your terrarium is looking grimy, you can clean it inside and out, but avoid using harsh cleaning products on the inside if you want to keep your plants happy.
Extra care tips
To prevent rot, remove fallen leaves and occasionally give your terrarium fresh air from an open window.