I love terrariums. In creating these tiny worlds, the possibilities are endless. Well, except for the possibility of creating a giant world. That’s part of the allure of these little beauties, I think — the ability to maintain a ‘whole’ garden at a darling scale. If managing a house full of indoor plants still proves too much, there’s always the magic and charm of the terrarium garden.
So the story goes (thanks, wikipedia), the terrarium was invented in the early-mid 1800s by English doctor, Nathaniel Bagshaw Ward. Ward had a thing for observing insects in jars, and noticed that the moisture and humidity maintained within a sealed jar was conducive to both germinating seeds and keeping plants alive on long voyages to the British colonies.
Terrariums have a special place in Australia’s history. Originally called ‘Wardian cases’, they were used for exporting plants from London to Sydney during the colonial years. Likewise, they’d be used to transport native Australian specimens back to England.
Terrariums (also terraria) come in two forms, closed and open, each creating conditions suitable for different types of plants.
Closed terrariums: Like the original Wardian cases, closed terrariums are more or less sealed, keeping in moisture that evaporates and condenses as external temperatures fluctuate. Thus, they tend to be humid on the inside, as well as sheltered from wind — ideal for mosses, ferns and other tropical plants.
They’re not completely isolated systems, though. Once in a while, closed terrariums should be opened to let excess moisture evaporate. This helps prevent the growth of mould or algae on the glass (or on the plants!). If the terrarium isn’t completely airtight, it may also need to be watered to prevent it from drying out over time.
Open terrariums: Open terrariums, on the other hand, don’t trap much humidity at all. This makes them great for plants, like succulents, that prefer drier conditions and fresh air. Naturally, they’ll need more attention than their closed counterparts in the watering (or misting), sunlight and temperature departments.
Making a terrarium is easy and fun. And messy! A quick search of Google or YouTube will turn up hundreds of tutorials and DIY demonstrations on how to make your own tiny world (like this illustrated one). So let’s just cover an overview.
Terrarium containers are usually glass, but you can use plastic too. You’ll get by as long as it’s transparent (to let sunlight through), holds water, and won’t deteriorate quickly. Floristry supply stores often sell sealed and open glass containers designed for holding plants but, at a pinch, you can recycle old bottles and jars found around your home or at the op-shop.
Substrates will often vary with the types of plants and style of terrarium you create. A terrarium for bonsai or tropical plants, for example, typically needs the full suite of substrates: activated charcoal (to help maintain pH levels), gravel or small river stones (for drainage) and potting mix (as a growing medium). However, succulent or tillandsia terrariums – with their reduced need for moisture – can survive quite comfortably with minimal potting mix and sand (or stones).
Before you make or buy a terrarium, consider where in your home or office you plan to keep it, as this may affect the plants you choose. For example, a lucky bamboo (Dracaena sanderiana) would do best in bright, indirect sunlight, but if your home is rather dark at the best of times, you might find a bromeliad or moss terrarium easier to keep alive.
The size of your terrarium and the amount of care you’re willing to invest will also limit your choice of plants, as fast-growing species like a Benjamin fig (Ficus benjamina) or golden pothos (Epipremnum aureum) could easily outgrow its container in a matter of months if left unpruned — that said, your mileage may vary: I once had a healthy golden pothos in a small closed terrarium for almost 3 years before growing it as a regular potted houseplant.
Here are a few tough little plants to get your terrarium started:
Small plastic toys are a common favourite in modern terrariums, but natural items like shells, coral, fossils, bones, wood and interesting rocks make excellent additions too. Decor, of course, is optional, but adding tiny inanimate trinkets can breathe that extra bit of life into your tiny world (ironic, isn’t it?). They transform an arrangement of plants into a scene, a setting that fuels wonder and imagination.