Creating A Terrarium: A Guide For Australians

how to make a terrarium australia

Terrariums are a great way to bring a touch of nature into your home without the hassle of high maintenance. They are self-sustaining ecosystems that require very minimal attention and are perfect for those who are busy or away often. With a terrarium, you can create a miniature world of plants and even small animals, all coexisting in a confined space. The first step to crafting your own terrarium is choosing the right container, which will set the stage for your green scene. Go for a spacious container with a wide opening, made of glass or clear plastic, to ensure your plants have room to grow and thrive. From there, you can start building layers of stones, charcoal, moss, and soil to create the perfect environment for your plants to flourish. With the right care and maintenance, your terrarium will become a thriving, low-maintenance garden.

Characteristics Values
Container Glass, heavy plastic, reused jars, or goldfish bowls
Container size Spacious to allow for ample air circulation and room for growth
Container shape Wide opening for easy planting and stabilising internal climate
Container material Glass for clarity and non-reactivity
Light Bright, indirect sunlight
Water Sparingly, using a small watering can or spray bottle to distribute water evenly
Maintenance Regular upkeep, including watering, pruning, and cleaning
Plants Ferns, mosses, Calathea, Orchids, Philodendron, African Violets, Peperomia, Fittonia, Hypoestes, Crotons, or Cryptanthus

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Choosing a container

Choosing the right container is an important step in creating a terrarium. The container you select will determine the success of your terrarium. Here are some factors to consider when choosing a container:

Size

A spacious container is ideal as it allows for ample air circulation and room for growth. This also reduces the risk of your plants feeling cramped and stressed. Ensure there is enough space at the top of the container for easy planting and maintenance.

Shape and Access

A container with a wide opening is recommended as it makes it easier to arrange your plants and for the internal climate to stabilise. While unique shapes may be visually appealing, they can create microclimates and maintenance challenges.

Material

Glass is the most popular choice due to its clarity and non-reactive nature. It provides an unobstructed view of your miniature landscape while keeping the chemistry drama-free. However, other transparent materials such as heavy plastic, reused jars, or even goldfish bowls can also be used.

Transparency

It is essential to select a transparent container that allows light to pass through. This is crucial for the growth of your plants. Closed terrariums, which are usually in transparent, sealable containers, create a miniature water cycle by recycling air and water.

When choosing a container for your terrarium, consider its size, shape, material, and transparency. These factors will impact the overall success and maintenance of your terrarium ecosystem.

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Preparing the base

Firstly, select a suitable container. The container sets the stage for your terrarium's success. Opt for a spacious container with a wide opening, made of glass, heavy plastic, or even a reused jar or bowl. Ensure it is transparent, allowing light to pass through and enabling you to view your miniature landscape. The container should be large enough for your plants to grow and easy to access for maintenance.

Next, start building the base layers. Begin with a layer of stones, gravel, or pebbles at the bottom. This layer should be approximately 2.5 centimetres thick, providing good drainage and preventing root rot. On top of this, add a thin layer of activated charcoal. This layer is essential for preventing odours and mould, as well as controlling drainage and removing toxins.

Following the charcoal, add a layer of moss or sphagnum moss. This layer separates the soil from the drainage layer, providing a barrier. You can also use coconut fibre, but be mindful that it absorbs water quickly.

Finally, finish the base layers with a well-draining potting mix or soil. Make sure the potting mix is at least 4 centimetres deep, providing enough space for your plants' roots to grow. You can create a mini landscape by forming hills and valleys in the soil. At this point, you can also get creative by alternating layers of soil with sand or pebbles to create patterns. Just ensure the top layer has sufficient soil for planting.

Once the base layers are complete, you are ready to start planting. Remember to choose plants that are suitable for terrariums, such as slow-growing and resilient species that can thrive in a confined space.

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Selecting plants

Selecting the right plants for your terrarium is crucial. Think of them as tiny, leafy tenants who don't need to be evicted for growing out of control. Choosing plants for your terrarium is like casting for an ensemble TV show – you need a balanced mix of characters that can coexist in a shared space. Here are some tips to help you pick a winning lineup:

Go for growth control: Opt for plants that know their limits. You want species that are content with their plot of land and don't have ambitions of taking over the entire glass dome. Slow-growers are your best bet.

Hardiness is key: Select plants that are the survivalists of the plant kingdom – tough, resilient, and ready to thrive with minimal intervention.

Biomass balance: Your terrarium is a stage, and the plants are the actors. Too few, and the show feels empty; too many, and it's overcrowded. A spacious container allows for ample air circulation and room for growth, reducing the risk of your plants feeling claustrophobic and stressed. If your terrarium is to be viewed from all angles, arrange the plants with the tallest one in the middle.

Some plants that are well-suited for terrariums include ferns, mosses, Calathea, Orchids, Philodendron, African Violets, Peperomia, Fittonia, Hypoestes, Crotons, and Cryptanthus.

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Watering

Open Terrariums

Open terrariums should be watered directly into the soil until it is moist, but not soaking wet. This is usually done weekly or fortnightly, depending on the season. It is important to not let open terrariums dry out completely. Check for water in the bottom rocks of the terrarium before watering again. About 1 cm of water is enough. If you are going away for an extended time, cover the top of the open terrarium to stop it from drying out.

Closed Terrariums

Closed terrariums require minimal watering. Check that the soil is moist, and if in doubt, do not water. Closed terrariums will usually fog up due to their humid atmosphere. A rule of thumb for most closed terrariums is to water them every 3-6 months, depending on the season, size, and type of vessel. However, it is best to routinely check how dry the soil is before watering. Remember that closed terrariums do not have a drainage system, so excess water cannot be removed and could destroy the plants. If you accidentally overwater, address it immediately by using paper towels to absorb the excess water. Never water your closed terrarium while there is still condensation inside.

Succulent and Cacti Terrariums

Succulent and cacti terrariums can be misted once a week, allowing the soil to dry out between watering. You can adjust the frequency of watering according to the weather. Succulent terrariums should be a little dry rather than over-watered.

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Maintenance

Terrariums are low-maintenance ecosystems that require specific care to maintain their balance. They are a great option for those who are busy or travel frequently, as they create a self-perpetuating microclimate where plants can thrive for years with minimal upkeep. Here are some maintenance tips to keep your terrarium healthy:

Watering

Water your terrarium sparingly and only when the soil is dry, typically every 1 to 2 weeks. The easiest way to check if your terrarium needs watering is to poke your finger into the soil. If it feels dry, it's time to water. Avoid overwatering as this can lead to mould, root rot, and an unhealthy buildup of excess water. Closed terrariums rarely need watering; only water them if the glass doesn't steam up overnight. For open terrariums, water sparingly based on the plant type. Succulents, for example, require very little water.

Light and Ventilation

Terrariums require bright, indirect light to thrive. Place them near a sunny window or under a grow light. Avoid direct sunlight and heat sources as these can cause overheating and dehydration. For closed terrariums, open the lid slightly if condensation builds up to allow moisture to escape.

Pruning and Cleaning

Prune your plants to maintain their shape and prevent overcrowding. Promptly remove dead plant material to prevent decay. Clean glass containers regularly to maintain clarity and prevent algae growth. Wash your terrarium with warm soapy water every 6-12 months. Remove all plants and soil, rinse thoroughly, and allow it to dry completely before replanting.

Soil and Drainage

Use a soil mix appropriate for your chosen plants. For example, use cactus soil for succulents and rich soil for tropical plants. Ensure good drainage and air circulation to prevent mould. Pebbles or gravel at the bottom of the container can help prevent root rot by keeping the plant roots from sitting in water.

Charcoal and Moss

Add a layer of activated charcoal to the bottom of your terrarium to absorb moisture, prevent smells, and act as a filter to remove toxins and bacteria. You can also add a layer of sphagnum moss to stop the potting mix from settling into the lower layers.

Frequently asked questions

Terrariums are ecosystems composed of plants and small animals within a confined space. They are low-maintenance, versatile, and boost oxygen levels in your living space.

You will need a container, gravel or pebbles, activated charcoal, sphagnum moss or coconut fibre, potting mix or soil, and plants. You can use an old, clean jar or bottle as a container.

Choose plants that are slow-growing and resilient, such as ferns, mosses, Calathea, Orchids, Peperomia, and Hypoestes. Avoid plants that grow too big for the container.

Water your terrarium sparingly using a small watering can or spray bottle. Prune your plants regularly to maintain their shape and prevent overcrowding. Avoid direct sunlight to prevent overheating and water accumulation.

Open terrariums are exposed to the outside environment and require regular watering. Closed terrariums are sealed and create a miniature water cycle, requiring less frequent watering.

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